TECHNICAL PRODUCT INFORMATION
Spring wire for applications with
high performance demands
Suzuki Garphyttan has produced wire since 1906.
Since 1927 the main product is oil tempered valve
spring wire for the automotive industry. During the
years others special wires such as stainless round
wire, flat rolled and shaped wire in carbon, low alloyed
and stainless material, have been added to the product program. We have acquired extensive knowledge
and experience of steel grades, efficient manufacturing and quality control which is crucial to the properties of the finished product. Large resources are invested in research concerning improved properties of
our products and improved manufacturing processes,
enabling Suzuki Garphyttan to be world leader in the
manufacturing of spring wire.
The main focus is spring wire for combustion
engines (valve and transmission springs, piston
rings, compression rings, fuel injection springs)
and other automotive applications.
Coiling properties
Defect free surfaces, narrow dimensional and tensile strength tolerances are important in achieving
the best properties for spring coiling. Each wire is continuously controlled during the entire manufacturing – from wire rod to the finished product – according to a specific control plan.
Certified quality
Suzuki Garphyttan has a Quality Management System certified according to the International Standard
for Quality ISO TS 16949.
Our main wire rod suppliers also have Quality Management Systems certified by a third party according to ISO 9001 as a minimum and are also regularly audited by Suzuki Garphyttan.
Technical support
We are prepared to assist you in utilizing modern materials for maximum performance. For us it is obvious and necessary to be at the front, to serve our customers, discussing problems and areas for
development in existing as well as new products.
Environmental awareness
Our goal is to manufacture high quality products without any negative effects on the environment. We
are continuously improving our manufacturing processes to improve both internal and external environment. Before new investments are made, special consideration is given to environmental solutions.
We are certified according to ISO 14001.
For more information regarding different elements in our products we recommend the database
IMDS ”International Material Data System” where each element is named with a separate CAS-No.
See the following Internet address: www.mdsystem.com.
August 2014
This information is subject to change (design, dimensions,
technical data, etc) without prior notice.
Oil tempered
special spring
wire for applications
with high performance
requirements
August 2014
This information is subject to change (design, dimensions,
technical data, etc) without prior notice.
High quality oil tempered wire
OTEVA® oil tempered valve spring wire
KD oil tempered clutch and transmission spring
wire
For valve springs in combustion engines as well as for
transmission and crankshaft damper springs subjected to
extreme fatigue. OTEVA® grades cover different demands
of high performance in tensile strength and fatigue life.
For use in clutch springs of different types with various performance demands. KD is an oil tempered wire with good
dynamical characteristics.
Our valve spring wire grades differ from each other in
terms of chemical, mechanical and technical properties as
well as required surface finish with regard to surface depth
and decarburization levels.
STATO oil tempered spring wire
An oil tempered wire grade used for springs subjected to
static stress or moderate fatigue. STATO is available in
different types of steel demanding ultimate tensile strength,
and relaxation properties comparable to the OTEVA®
grades.
Oil tempered wire is also manufactured with egg or elliptical cross sections. Profiled cross sections give the advantage of optimum distribution of stresses in a spring (see
fig.).
Stress distribution
in transversal section
comparing round
(picture to the right)
and egg shaped
(picture to the left)
wire respectively.
Chemical composition, approximate values in %
Our grades
C
Si
P max.
S max.
Cr
V
Ni
Mo
W
OTEVA® 101 SC
0.60
2.25
0.50 0.020
Mn
0.025
1.25
0.15
–
0.15
0.15
OTEVA® 96 SC/SC PLUS
0.64
2.15
0.45 0.020
0.025
0.97
0.13
–
0.13
–
OTEVA® 91 SC/SC PLUS
0.63
2.00
0.45 0.020
0.025
0.90
0.10
–
0.10
–
OTEVA® 90 SC/SC PLUS
0.60
2.00
0.85 0.020
0.020
0.95
0.10
0.30
–
–
OTEVA® 76 SC/SC PLUS
0.60
1.47
0.70 0.020
0.020
0.75
0.15
0.30
–
–
OTEVA® 75 SC/SC PLUS
0.60
1.47
0.70 0.020
0.020
0.75
0.15
–
–
–
OTEVA® 74 SC/SC PLUS
0.65
1.47
0.70 0.025
0.025
0.70
–
–
–
–
OTEVA® 70 SC/SC PLUS
0.53
1.47
0.70 0.025
0.020
0.67
–
–
–
–
SWOSC-VHV
0.60
1.47
0.70 0.020
0.020
0.67
0.15
–
–
–
SWOSC-V
0.53
1.47
0.70 0.025
0.020
0.67
–
–
–
–
75 KD, 75 KD S
0.60
1.47
0.70 0.025
0.020
0.67
0.15
–
–
–
70 KD, 70 KD S
0.53
1.47
0.70 0.025
0.020
0.67
–
–
–
–
STATO 75
0.60
1.47
0.70 0.025
0.025
0.67
0.15
–
–
–
STATO 70
0.53
1.47
0.70 0.025
0.025
0.67
–
–
–
–
June 2016
This information is subject to change (design, dimensions,
technical data, etc) without prior notice.
High quality oil tempered wire
Nearest equivalent standards
Our grades
EN 10270-2
SIS
ASTM
B.S.
JIS
OTEVA® 101 SC
–
–
–
–
–
OTEVA® 96 SC/SC PLUS
–
–
–
–
–
OTEVA® 91 SC/SC PLUS
–
–
–
–
–
OTEVA® 90 SC/SC PLUS
–
–
–
–
–
OTEVA® 76 SC/SC PLUS
–
–
–
–
–
OTEVA® 75 SC/SC PLUS
VDSiCrV
–
–
–
–
OTEVA® 74 SC/SC PLUS
–
–
–
–
–
OTEVA® 70 SC/SC PLUS
VDSiCr
142090-05
A 877
2803 685A55HD
JIS G 3561 SWOSC-V
VDSiCrV
–
–
–
–
VDSiCr
142090-05
A 877
2803 685A55HD
JIS G 3561 SWOSC-V
75 KD, 75 KD S
TDSiCrV
–
–
–
–
70 KD, 70 KD S
TDSiCr
142090-05
A 401
2803 685A55ND
–
STATO 75
FDSiCrV
–
–
–
–
STATO 70
FDSiCr
142090-05
A 401
2803 685A55HS
JIS G 3568 SWOSC-B
SWOSC-VHV
SWOSC-V
June 2016
This information is subject to change (design, dimensions,
technical data, etc) without prior notice.
Eddy Current continuous
surface testing
Suzuki Garphyttan uses the most advanced Eddy Current testing equipment available on the market. Experience
from many years of surface testing in efficient continuous testing lines is a guarantee for high quality spring wire.
Eddy Current testing is carried out on material with high demands on surface quality.
EC-testing is performed with both rotating (R) and stationary (D) probe test equipment. The different levels of EC-testing are
indicated in the steel grade designations in the table below.
Steel grade designations
OTEVA® 101 SC
RD40 S
OTEVA® 96 SC/SC PLUS
RD40 S
OTEVA® 91 SC/SC PLUS
RD40 S
OTEVA® 90 SC/SC PLUS
RD40 S
OTEVA® 76 SC/SC PLUS
RD40 S
OTEVA® 75 SC/SC PLUS
RD40 S
OTEVA® 74 SC/SC PLUS
RD40 S
OTEVA® 70 SC/SC PLUS
RD40 S
OTEVA® 70 SC S
(*)
OTEVA® 70 SC
(*)
SWOSC-VHV
RD40 S
SWOSC-V
RD40 S
75 KD, 75 KD S
R60
75 KD
(*)
70 KD, 70 KD S
R60
70 KD
(*)
STATO 75
(*)
STATO 70
(*)
SC
= Super Clean
R
= Rotation probe testing
RD
= Rotation probe + stationary probe testing
40, 60 = Defect depth levels in µm
S
= Shaved
Continuous testing of surface defects is performed as standard in sizes from 2.00 – 6.00 mm.
Other sizes can be agreed upon.
Grades indicated with (*) refer to material outside the size range 2.00 – 6.00 mm, or grades not requiring EC-testing.
June 2016
This information is subject to change (design, dimensions,
technical data, etc) without prior notice.
Delivery forms
Oil tempered spring wire
Delivery forms
Spool/Coil diameter
Inner
Outer
diam.
diam.
min. mm
max. mm
Coil/Spool
weight
abt. kg
Wire sizes
mm
Type
Code
0.50 – 1.00
0.50 – 2.10
Plastic spool
Metal spool
S4610
S6520
314
400
460
700
1.10 – 2.50
0.80 – 2.50
0.80 – 2.50
Coils/Carrier No 1
Coils/Carrier No 2
Coils/Wooden Box
RU0004
RM0004
RM0021
RM0024
RM0025
RM0027
450
450
450
450
450
450
700
700
700
700
700
700
225
225
225
110
110
110
2.00 – 3.00
Coils/Carrier No 3
RM0006
RU0006
RU0019
RU0021*
720
720
720
720
1 200
1 200
1 200
1 200
225
450
450
450
2.00 – 4.00
Coils/Wooden Box
RM0021
RM0022
RM0023
720
720
720
1 200
1 200
1 200
225
225
225
2.00 – 3.00
Coils/Carrier No 4
RU0011
RU0020
RU0022*
1 070
1 070
1 070
1 500
1 500
1 500
900
900
900
> 3.00 – 6.50 Coils/Carrier No 5
RU0012
RU0014*
1 070
1 070
1 500
1 500
1 800
1 800
1 350
1 650
500
> 6.50 – 14.00 Coils**
40
110 / 225
* RU0014, RU0021 and RU0022 have VCI plastic cover, oversea transport.
** Sizes > 6.50 – 14.00 mm in coils in unshaved condition subcontracted.
Packing
The packings for the different delivery forms can be seen in the next page.
Standard packing alternatives (others can be delivered on special request):
Plastic and metal spool covered with paper
- on EUR-pallet (S-codes)
Coil covered with plastic hood
- on carrier (RU-codes)
Coil covered with VCI plastic hood
- on carrier (RU-codes) oversea transport.
Coils separately wrapped with paper
- on carrier (RM-codes)
Coils separately wrapped with paper
- in wooden boxes (RM-codes)
Wire sizes 6.50 – 10.00 mm are subcontracted and the sales is organized from our German office.
Packaging materials used are only those which can be recycled, such as paper and polyethylene.
August 2014
This information is subject to change (design, dimensions,
technical data, etc) without prior notice.
Delivery forms
Oil tempered spring wire
Carriers
Surface: galvanized
Type
Delivery
form
Code
Carrier 1
RU0004
800
1200 1000
420
17
700
Carrier 2
RM0004
800
1200 1000
540
17
300
Carrier 3
RM0006
RU0006
RU0019
RU0021
800
800
800
800
1200
1200
1200
1200
900
900
900
900
720
720
720
720
18
18
18
18
1200
1200
1200
1200
Carrier 4
RM0011
RU0011
RU0020
RU0022
1160
1160
1160
1160
1530
1530
1530
1530
960
960
960
960
1070
1070
1070
1070
31
31
31
31
1200
1200
1200
1200
Carrier 5
RU0012
RU0014
1160
1160
1530 1200 1070
1530 1200 1070
42
42
1800
1800
Size, mm
A
B
C
D
Tara
weight
abt. kg
Max
weight
abt. kg
Spools
Colour: black/green
Type
Delivery
form
Size, mm
Code
A
B
Plastic
S4610 460
105
319
91
305
Metal
S6520 695
314
400
270
33
C
D
E
Tara
weight
abt. kg
1.8
26
Max.
weight
abt. kg
40
275
EUR-pallet
Spools
Type
Delivery
form
Code
1
SP6520
800
1200
150
26
225
750
2
SP4611
800
1200
340
34
40
500
3
SP4612
800
1200
540
42
40
750
4
SP4613
800
1200
740
50
40
1000
Size, mm
Width
Length
Height
Tara
weight
abt. kg
Spool
weight
abt. kg
Weight
abt. kg
Packing of plastic and metal spools on EUR-pallet. Max. weight 1000 kg.
Wooden boxes
Boxes for paper wrapped coils
Delivery
form
Code
Outer size, mm
Width
Length
Height
Tara
weight
abt. kg
Coil
weight
abt. kg
Weight
abt. kg
RM0021
1110
1150
1000
78
225/450
1 000
RM0022
1110
1150
620
57
225/450
500
RM0023
1110
1150
430
48
225/450
250
RM0024
850
850
950
52
110
450
RM0025
850
850
600
36
110
225
RM0027
850
850
450
20
110
145
The paper wrapped coils with wire sizes > 2.50 mm are placed in wooden boxes
with code RM0021-23 and coils with wire sizes < 2.50 mm in the boxes RM0024-27.
August 2014
This information is subject to change (design, dimensions,
technical data, etc) without prior notice.
OTEVA® 101 SC
Oil tempered SiCrVMoW-alloyed ultra-high tensile clutch and transmission spring wire for surface nitriding
OTEVA® 101 SC is a Super Clean steel, especially intended for the manufacture of clutch and transmission springs and
other springs requiring high fatigue properties and good relaxation properties at increased working temperatures.
Manufactured as standard in shaved condition in sizes from Ø 2.00 mm to 5.00 mm or in egg or elliptical shape corresponding to round cross section 2.50 mm to 5.00 mm. Other wire sizes on request.
Chemical composition
C
Si
Mn
P max.
S max.
Cr
V
Mo
W
%
%
%
%
%
%
%
%
%
2.10 – 2.40
0.30 – 0.70
0.025
1.10 – 1.40
0.05 – 0.25
0.05 – 0.25
0.05 – 0.25
0.50 – 0.70
0.020
4)
Physical properties
1)
Size range
mm
2)
Tolerance
± mm
Tensile strength
2
N/mm
3)
Reduct. of area
min. %
Torsions
l=300 mm,
min. revs.
2.00 – 2.50
0.020
2100 – 2200
40
2
>2.50 – 3.20
0.020
2100 – 2200
40
2
>3.20 – 4.00
0.025
2100 – 2200
40
2
>4.00 – 5.00
0.025
2100 – 2200
40
2
1)
Other wire sizes on request.
2)
Ovality, i. e. the difference between the largest and smallest dimension of a cross section, is maximum half the tolerance range.
Conversion from tensile strength to hardness values can be calculated in standard ISO EN 18265. The tensile strength R m within one
2
coil does not vary more than 50 N/mm .
3)
4)
Torsion test is carried out for assessing deformability. The fracture of the torsion test piece shall be smooth and perpendicular to the
wire axis. The rupture shall show no longitudinal cracks.
Surface condition – non-destructive testing
In the standard size range 2.00 - 5.00 mm the wire is tested
continuously in Eddy Current equipment to a surface level
of > 40 microns. Other wire sizes on request.
Surface condition – end sample test
The wire is end sample tested by means of etch testing and
binocular inspection as well as microscopical inspection of
the material structure.
Max. permissible depth of partial surface decarburization
and surface defects, 0.5% x wire diameter. No complete
decarburization allowed.
Cleanliness in steel
The presence of non-metallic inclusions in the wire rod is
inspected for every heat in accordance with the Suzuki
Garphyttan method (or alternative max. T-method).
Our criteria for releasing wire rod material for valve spring
wire are the following;
For wire rod samples: Inclusion size max. 15 µm in surface
area.
Inclusion size, surface
Max. number of inclusions
5–10
50
> 10–15
7
As stated by IVSWMA*, it is likely to find occasional inclusions in valve spring quality steel of a size larger than
15µm.
* IVSWMA: International Valve Spring Wire Manufacturers Association
Heat treatment
As soon as possible after coiling, the springs should be
stress relieved. Depending on nitriding temperature used
later in the spring manufacturing process, this temperature
may be decreased.
Hot presetting
After shot peening, the springs should be hot preset or
stress relieved. In order to reach optimum fatigue and relaxation properties, the springs must be preset at an appropriate stress.
Delivery forms
See separate sheet.
>15 µm
0
June 2016
This information is subject to change (design, dimensions,
technical data, etc) without prior notice.
OTEVA® 101 SC
Oil tempered SiCrVMoW-alloyed ultra-high tensile clutch and transmission spring wire for surface nitriding
Soft shot peening
Before the nitriding process a soft shot peening process
shall be applied in order to remove the oxide layer on the
spring wire surface.
Spring conditions for fatigue and relaxation tests
(specially designed test spring) Diagrams 1 and 2:
Wire diameter
Spring index
Ø 3.85 mm
6
Nitriding
Springs of OTEVA® 101 SC must be nitrided to obtain
optimum fatigue and relaxation properties. Our recommendation is gas nitriding.
Stress relieving
Temperature
Time
450°C (790 ±10 °F)
30 minutes
Soft shot peened
Speed
Time
Shot size
20-30 m/s
5 min
0.8 mm
Nitriding
Temperature
Time
Aim for surface hardness
Aim for core hardness
Compound (white) layer
Gas nitriding
450-470°C
5-20 hours
Min. 850 Hv
Min. 610 Hv
Max. 1 µm.
Shot peening
In order to obtain optimum fatigue properties, the process
time should be adjusted to get a complete treatment. Size
of shots should be adapted to wire dimension, pitch and
shot peening equipment.
For nitrided springs with an extremely hard surface zone, it
is important to use a shot peening media with high hardness.
Shot peening of the inside of the spring coils is particularly
critical.
Relaxation and fatigue properties
In diagram 1 the fatigue properties of this grade are illustrated in a Goodman-diagram, based on a special test
spring design.
Diagram 2 shows the relaxation properties (loss of load) of
nitrided springs made from OTEVA® 101 SC wire subjected
to static compression at different temperatures, nitrided/not
nitrided.
For further technical support, please contact Suzuki
Garphyttan.
Diagram 1 –Fatigue properties for nitrided springs.
Shot peening (triple shot
peening for nitrided springs)
1st treatment
Aim for Almen arc-height
Pressure 0.3 MPa with RCW shoot
size 0.6 mm (hardness 800 Hv) for
20 minutes.
Pressure 0.3 MPa with RCW shoot
size 0.25 mm (hardness 800 Hv)
for 10 minutes.
Pressure 0.2 MPa with fine shoot
size (hardness 700 HV) for 10
minutes.
0.55 – 0.60 mm
Hot presetting
(theoretically set)
Temperature
Time
1500 N/mm (nitrided springs)
2
1300 N/mm (not nitrided springs)
200°C (max. 250°C)
10 minutes
2nd treatment
3rd treatment
2
Diagram 2 –Relaxation properties for nitrided springs.
June 2016
This information is subject to change (design, dimensions,
technical data, etc) without prior notice.
OTEVA® 96 SC/ OTEVA® 96 SC PLUS
Oil tempered SiCrVMo-alloyed ultra-high tensile valve spring wire for
surface nitriding
OTEVA® 96 SC is a Super Clean steel, especially intended for the manufacture of clutch/transmission springs with extremely
high fatigue properties and good relaxation properties at increased working temperatures.
Manufactured as standard in shaved condition in sizes from Ø 2.00 mm to 6.00 mm, or in egg or elliptical shape corresponding to round cross section 2.50 mm to 6.00 mm. Other wire sizes on request.
OTEVA® 96 SC PLUS is intended for manufacture of valve springs and other springs requiring extremely high fatigue properties and good relaxation properties at increased working temperatures.
Chemical composition
C
%
Si
%
Mn
%
P max.
%
S max.
%
Cr
%
V
%
Mo
%
0.60 – 0.70
2.00 – 2.20
0.30 – 0.60
0.020
0.025
0.90 – 1.00
0.10 – 0.15
0.10 – 0.15
Physical properties
4)
1)
Size range
mm
2)
Tolerance
± mm
3)
Tensile strength
2
N/mm
Reduct. of area
min. %
Torsions
l=300 mm,
min. revs.
2.00 – 2.50
0.020
2180 – 2280
45
5
>2.50 – 3.20
0.020
2130 – 2230
45
5
>3.20 – 4.00
0.025
2080 – 2180
45
4
>4.00 – 5.00
0.025
2030 – 2130
45
3
>5.00 – 5.60
0.030
1980 – 2080
40
3
>5.60 – 6.00
0.035
1980 – 2080
40
3
1)
Other wire sizes on request.
2)
Ovality, i. e. the difference between the largest and smallest dimension of a cross section, is maximum half the tolerance range.
3)
Conversion from tensile strength to hardness values can be calculated in standard ISO EN 18265. The tensile strength R m within one
2
coil does not vary more than 50 N/mm .
4)
Torsion test is carried out for assessing deformability. The fracture of the torsion test piece shall be smooth and perpendicular to the
wire axis. The rupture shall show no longitudinal cracks.
Yield point
The proof stress Rp0.2 is min. 0.8 x tensile strength of the
wire. The proof stress will rise above 0.9 x tensile strength
after stress relieving the springs.
E and G modulus
2
Modulus of elasticity, E:
About 206 kN/mm
Modulus of shear, G:
About 79.5 kN/mm2
Surface condition - non-destructive testing
In the standard size range 2.00 - 6.00 mm the wire is tested
continuously in Eddy Current equipment to a surface level
of > 40 microns. Other wire sizes on request.
Surface condition - end sample test
The wire is end sample tested by means of etch testing and
binocular inspection as well as microscopical inspection of
the material structure.
Max. permissible depth of partial surface decarburization
and surface defects, 1 % x wire diameter. In shaved condition; for diameters <=2 .00 mm 10 µm, for diameters > 2.00
mm 0.5% x d.
Cleanliness in steel
The presence of non-metallic inclusions in the wire rod is
inspected for every heat of OTEVA® 96 SC in accordance
with the Suzuki Garphyttan method (or alternative max. T-
method). For OTEVA® 96 SC PLUS an additional extended
inspection method applies.
Our criteria for releasing wire rod material for valve spring
wire are the following;
For wire rod samples: Inclusion size max. 15 µm in surface
area.
Inclusion size, surface
Max. number of inclusions
5–10
50
> 10–15
7
>15 µm
0
As stated by IVSWMA*, it is likely to find occasional inclusions in valve spring quality steel of a size larger than
15µm.
* IVSWMA: International Valve Spring Wire Manufacturers Association
Heat treatment
As soon as possible after coiling, the springs should be
stress relieved. Depending on nitriding temperature used
later in the valve spring manufacturing process, this temperature may be decreased.
Hot presetting
After shot peening, the springs should be hot preset or
stress relieved. In order to reach optimum fatigue and relaxation properties, the springs must be preset at an appropriate stress.
June 2016
This information is subject to change (design, dimensions,
technical data, etc) without prior notice.
OTEVA® 96 SC/ OTEVA® 96 SC PLUS
Oil tempered SiCrVMo-alloyed ultra-high tensile valve spring wire for surface nitriding
Delivery forms
See separate sheet.
Soft shot peening
Before the nitriding process a soft shot peening process
shall be applied in order to remove the oxide layer on the
spring wire surface.
Nitriding
Springs of OTEVA® 96 SC should be nitrided to obtain optimum fatigue and relaxation properties. Our recommendation is gas nitriding.
Shot peening
In order to obtain optimum fatigue properties, the process
time should be adjusted to get a complete treatment. Size of
shots should be adapted to wire dimension, pitch and shot
peening equipment.
For nitrided springs with an extremely hard surface zone, it
is important to use a shot peening media with high hardness.
Shot peening of the inside of the spring coils is particularly
critical.
Relaxation and fatigue properties
In diagram 1 the fatigue properties of this grade are illustrated in a Goodman-diagram, based on a special test spring
design.
Diagram 2 shows the relaxation properties (loss of load) of
springs made from OTEVA® 96 SC wire subjected to static
compression at different temperatures, nitrided/not nitrided.
For further technical support, please contact Suzuki
Garphyttan.
Final stress Tau (corr.)
2
N/mm
Number of cycles: 25 x 10
6
Spring conditions for fatigue and relaxation tests
(specially designed test spring) Diagrams 1 and 2:
Wire diameter
Spring index
Ø 3.85 mm
6
Stress relieving
Temperature
Time
450 ±5 °C (840 ±10 °F)
min. 420 °C (790 ±10 °F) for nitriding
30 minutes
Soft shot peened
Speed
Time
Shot size
20-30 m/s
5 min
0.8 mm
Nitriding
Temperature
Time
Aim for surface hardness
Aim for core hardness
Compound (white) layer
Gas nitriding
450-470°C
5-20 hours
Min. 800 Hv
Min. 560 Hv
Max. 1 µm.
Shot peening (triple shot
peening for nitrided springs)
1st treatment
Aim for Almen arc-height
Pressure 0.3 MPa with RCW shoot
size 0.6 mm (hardness 800 Hv) for
20 minutes.
Pressure 0.3 MPa with RCW shoot
size 0.25 mm (hardness 800 Hv)
for 10 minutes.
Pressure 0.2 MPa with fine shoot
size (hardness 700 HV) for 10
minutes.
0.55 – 0.60 mm
Hot presetting
(theoretically set)
Temperature
Time
1500 N/mm (nitrided springs)
2
1300 N/mm (not nitrided springs)
200°C (max. 250°C)
10 minutes
2nd treatment
3rd treatment
Initial stress
Tau (corr.)
2
N/mm
2
Nitrided
Time of test:
24 h
Not nitireded
2
Initial stress Tau (corr.) N/mm
Loss of load, %
Diagram 1 – Fatigue properties as nitrided/not nitrided.
Diagram 2 – Relaxation properties, nitrided/not nitrided springs
June 2016
This information is subject to change (design, dimensions,
technical data, etc) without prior notice.
OTEVA® 91 SC/ OTEVA® 91 SC PLUS
Oil tempered SiCrVMo-alloyed ultra-high tensile valve spring wire for
surface nitriding
OTEVA® 91 SC is a Super Clean steel, especially intended for the manufacture of clutch/transmission springs with extremely
high fatigue properties and good relaxation properties at increased working temperatures.
Manufactured as standard in shaved condition in sizes from Ø 2.00 mm to 6.00 mm, or in egg or elliptical shape corresponding to round cross section 2.50 mm to 6.00 mm. Other wire sizes on request.
OTEVA® 91 SC PLUS is intended for manufacture of valve springs and other springs requiring extremely high fatigue properties and good relaxation properties at increased working temperatures.
Chemical composition
C
%
Si
%
Mn
%
P max.
%
S max.
%
Cr
%
V
%
Mo
%
0.50 – 0.70
1.80 – 2.20
0.30 – 0.60
0.020
0.025
0.80 – 1.00
0.05 – 0.15
0.05 – 0.15
Physical properties
1)
Size range
mm
2)
Tolerance
± mm
Torsions
3)
Tensile strength
2
N/mm
4)
Reduct. of area
min. %
l=300 mm,
min. revs.
2.00 – 2.50
0.020
2180 – 2280
45
5
>2.50 – 3.20
0.020
2130 – 2230
45
5
>3.20 – 4.00
0.025
2080 – 2180
45
4
>4.00 – 5.00
0.025
2030 – 2130
45
3
>5.00 – 5.60
0.030
1980 – 2080
40
3
>5.60 – 6.00
0.035
1980 – 2080
40
3
1)
Other wire sizes on request.
2)
Ovality, i. e. the difference between the largest and smallest dimension of a cross section, is maximum half the tolerance range.
3)
Conversion from tensile strength to hardness values can be calculated in standard ISO EN 18265. The tensile strength R m within one
2
coil does not vary more than 50 N/mm .
4)
Torsion test is carried out for assessing deformability. The fracture of the torsion test piece shall be smooth and perpendicular to the
wire axis. The rupture shall show no longitudinal cracks.
Yield point
The proof stress Rp0.2 is min. 0.8 x tensile strength of the
wire. The proof stress will rise above 0.9 x tensile strength
after stress relieving the springs.
E and G modulus
2
Modulus of elasticity, E:
About 206 kN/mm
Modulus of shear, G:
About 79.5 kN/mm2
Surface condition – non-destructive testing
In the standard size range 2.00 - 6.00 mm the wire is tested
continuously in Eddy Current equipment to a surface level
of > 40 microns. Other wire sizes on request.
Surface condition – end sample test
The wire is end sample tested by means of etch testing and
binocular inspection as well as microscopical inspection of
the material structure.
Max. permissible depth of partial surface decarburization
and surface defects, 1 % x wire diameter. In shaved condition; for diameters <=2 .00 mm 10 µm, for diameters > 2.00
mm 0.5% x d.
Cleanliness in steel
The presence of non-metallic inclusions in the wire rod is
inspected for every heat of OTEVA® 91 SC in accordance
with the Suzuki Garphyttan method (or alternative max. Tmethod).
For OTEVA® 91 SC PLUS an additional extended inspection method applies.
Our criteria for releasing wire rod material for valve spring
wire are the following;
For wire rod samples: Inclusion size max. 15 µm in surface
area.
Inclusion size, surface
Max. number of inclusions
5–10
50
> 10–15
7
>15 µm
0
As stated by IVSWMA*, it is likely to find occasional inclusions in valve spring quality steel of a size larger than
15µm.
* IVSWMA: International Valve Spring Wire Manufacturers Association
Heat treatment
As soon as possible after coiling, the springs should be
stress relieved. Depending on nitriding temperature used
later in the valve spring manufacturing process, this temperature may be decreased.
May 2016
This information is subject to change (design, dimensions,
technical data, etc) without prior notice.
OTEVA® 91 SC/ OTEVA® 91 SC PLUS
Oil tempered SiCrVMo-alloyed ultra-high tensile valve spring wire for surface nitriding
Hot presetting
After shot peening, the springs should be hot preset or
stress relieved. In order to reach optimum fatigue and relaxation properties, the springs must be preset at an appropriate stress.
Spring conditions for fatigue and relaxation tests
(specially designed test spring) Diagrams 1 and 2:
Delivery forms
See separate sheet.
Wire diameter
Spring index
Soft shot peening
Before the nitriding process a soft shot peening process
shall be applied in order to remove the oxide layer on the
spring wire surface.
Stress relieving
Temperature
Time
450 ±5 °C (840 ±10 °F)
min. 420 °C (790 ±10 °F) for nitriding
30 minutes
Nitriding
Springs of OTEVA® 91 SC should be nitrided to obtain optimum fatigue and relaxation properties. Our recommendation is gas nitriding.
Soft shot peened
Speed
Time
Shot size
20-30 m/s
5 min
0.8 mm
Shot peening
In order to obtain optimum fatigue properties, the process
time should be adjusted to get a complete treatment. Size of
shots should be adapted to wire dimension, pitch and shot
peening equipment.
Nitriding
Temperature
Time
Aim for surface hardness
Aim for core hardness
Compound (white) layer
Gas nitriding
450-470°C
5-20 hours
Min. 800 Hv
Min. 560 Hv
Max. 1 µm.
For nitrided springs with an extremely hard surface zone, it
is important to use a shot peening media with high hardness.
Shot peening (triple shot
peening for nitrided springs)
1st treatment
Shot peening of the inside of the spring coils is particularly
critical.
2nd treatment
Relaxation and fatigue properties
In diagram 1 the fatigue properties of this grade are illustrated in a Goodman-diagram, based on a special test spring
design.
Diagram 2 shows the relaxation properties (loss of load) of
springs made from OTEVA® 91 SC wire subjected to static
compression at different temperatures, nitrided/not nitrided.
For further technical support, please contact Suzuki
Garphyttan.
Final stress Tau (corr.)
2
N/mm
Number of cycles: 25 x 10
Aim for Almen arc-height
Pressure 0.3 MPa with RCW shoot
size 0.6 mm (hardness 800 Hv) for
20 minutes.
Pressure 0.3 MPa with RCW shoot
size 0.25 mm (hardness 800 Hv)
for 10 minutes.
Pressure 0.2 MPa with fine shoot
size (hardness 700 HV) for 10
minutes.
0.55 – 0.60 mm
Hot presetting
(theoretically set)
Temperature
Time
1500 N/mm (nitrided springs)
2
1300 N/mm (not nitrided springs)
200°C (max. 250°C)
10 minutes
3rd treatment
Initial stress
Tau (corr.)
2
N/mm
6
Ø 3.85 mm
6
2
Nitrided
Not nitireded
Time of test:
24 h
2
Initial stress Tau (corr.) N/mm
Loss of load, %
Diagram 1 – Fatigue properties as nitrided/not nitrided.
Diagram 2 – Relaxation properties, nitrided/not nitrided springs
May 2016
This information is subject to change (design, dimensions,
technical data, etc) without prior notice.
OTEVA® 90 SC/ OTEVA® 90 SC PLUS
Oil tempered SiCrVNi-alloyed ultra-high tensile valve spring wire for
surface nitriding
OTEVA® 90 SC is a Super Clean steel, especially intended for the manufacture of clutch/transmission springs with extremely
high fatigue properties and good relaxation properties at increased working temperatures.
Manufactured as standard in shaved condition in sizes from Ø 2.00 mm to 6.00 mm, or in egg or elliptical shape corresponding to round cross section 2.50 mm to 6.00 mm. Other wire sizes on request.
OTEVA® 90 SC PLUS is intended for manufacture of valve springs and other springs requiring extremely high fatigue properties and good relaxation properties at increased working temperatures.
Chemical composition
C
%
Si
%
Mn
%
P max.
%
S max.
%
0.50 – 0.70
1.80 – 2.20
0.70 – 1.00
0.020
0.020
Cr
%
V
%
Ni
%
0.85 – 1.05
0.05 – 0.15
0.20 – 0.40
4)
Physical properties
1)
Size range
mm
2)
Tolerance
± mm
3)
Tensile strength
2
N/mm
Reduct. of area
min. %
Torsions
l=300 mm,
min. revs.
2.00 – 2.50
0.020
2180 – 2280
45
5
>2.50 – 3.20
0.020
2130 – 2230
45
5
>3.20 – 4.00
0.025
2080 – 2180
45
4
>4.00 – 5.00
0.025
2030 – 2130
45
3
>5.00 – 5.60
0.030
1980 – 2080
40
3
>5.60 – 6.00
0.035
1980 – 2080
40
3
1)
Other wire sizes on request.
2)
Ovality, i. e. the difference between the largest and smallest dimension of a cross section, is maximum half the tolerance range.
3)
Conversion from tensile strength to hardness values can be calculated in standard ISO EN 18265. The tensile strength R m within one
2
coil does not vary more than 50 N/mm .
4)
Torsion test is carried out for assessing deformability. The fracture of the torsion test piece shall be smooth and perpendicular to the
wire axis. The rupture shall show no longitudinal cracks.
Yield point
The proof stress Rp0.2 is min. 0.8 x tensile strength of the
wire. The proof stress will rise above 0.9 x tensile strength
after stress relieving the springs.
E and G modulus
Modulus of elasticity, E:
Modulus of shear, G:
2
About 206 kN/mm
About 79.5 kN/mm2
Surface condition – non-destructive testing
In the standard size range 2.00 - 6.00 mm the wire is tested
continuously in Eddy Current equipment to a surface level
of > 40 microns. Other wire sizes on request.
Surface condition – end sample test
The wire is end sample tested by means of etch testing and
binocular inspection as well as microscopical inspection of
the material structure.
Max. permissible depth of partial surface decarburization
and surface defects, 1 % x wire diameter. In shaved condition; for diameters <=2 .00 mm 10 µm, for diameters > 2.00
mm 0.5% x d.
Cleanliness in steel
The presence of non-metallic inclusions in the wire rod is
inspected for every heat of OTEVA® 90 SC in accordance
with the Suzuki Garphyttan method (or alternative max. Tmethod).
For OTEVA® 90 SC PLUS an additional extended inspection method applies.
Our criteria for releasing wire rod material for valve spring
wire are the following;
For wire rod samples: Inclusion size max. 15 µm in surface
area.
Inclusion size, surface
Max. number of inclusions
5–10
50
> 10–15
7
>15 µm
0
As stated by IVSWMA*, it is likely to find occasional inclusions in valve spring quality steel of a size larger than
15µm.
* IVSWMA: International Valve Spring Wire Manufacturers Association
Heat treatment
As soon as possible after coiling, the springs should be
stress relieved. Depending on nitriding temperature used
later in the valve spring manufacturing process, this temperature may be decreased.
June 2016
This information is subject to change (design, dimensions,
technical data, etc) without prior notice.
OTEVA® 90 SC/ OTEVA® 90 SC PLUS
Oil tempered SiCrVNi-alloyed ultra-high tensile valve spring wire for surface nitriding
Hot presetting
After shot peening, the springs should be hot preset or
stress relieved. In order to reach optimum fatigue and relaxation properties, the springs must be preset at an appropriate stress.
Delivery forms
Spring conditions for fatigue and relaxation tests
(specially designed test spring) Diagrams 1 and 2:
Wire diameter
Spring index
Ø 3.85 mm
6
Stress relieving
Temperature
See separate sheet.
Soft shot peening
Before the nitriding process a soft shot peening process
shall be applied in order to remove the oxide layer on the
spring wire surface.
Nitriding
Springs of OTEVA® 90 SC should be nitrided to obtain
optimum fatigue and relaxation properties. Our recommendation is gas nitriding.
Shot peening
In order to obtain optimum fatigue properties, the process
time should be adjusted to get a complete treatment. Size
of shots should be adapted to wire dimension, pitch and
shot peening equipment.
Time
450 ±5 °C (840 ±10 °F)
min. 420 °C (790 ±10 °F) for nitriding
30 minutes
Soft shot peened
Speed
Time
Shot size
20-30 m/s
5 min
0.8 mm
Nitriding
Temperature
Time
Aim for surface hardness
Aim for core hardness
Compound (white) layer
Gas nitriding
450-470°C
5-20 hours
Min. 800 Hv
Min. 560 Hv
Max. 1 µm.
Shot peening (triple shot
peening for nitrided springs)
1st treatment
Aim for Almen arc-height
Pressure 0.3 MPa with RCW shoot
size 0.6 mm (hardness 800 Hv) for
20 minutes.
Pressure 0.3 MPa with RCW shoot
size 0.25 mm (hardness 800 Hv)
for 10 minutes.
Pressure 0.2 MPa with fine shoot
size (hardness 700 HV) for 10
minutes.
0.55 – 0.60 mm
Hot presetting
(theoretically set)
Temperature
Time
1500 N/mm (nitrided springs)
2
1300 N/mm (not nitrided springs)
200°C (max. 250°C)
10 minutes
For nitrided springs with an extremely hard surface zone, it
is important to use a shot peening media with high hardness.
2nd treatment
Shot peening of the inside of the spring coils is particularly
critical.
3rd treatment
Relaxation and fatigue properties
In diagram 1 the fatigue properties of this grade are illustrated in a Goodman-diagram, based on a special test
spring design.
Diagram 2 shows the relaxation properties (loss of load) of
springs made from OTEVA® 90 SC wire subjected to static
compression at different temperatures, nitrided/not nitrided.
For further technical support, please contact Suzuki
Garphyttan.
Initial stress
Final stress Tau (corr.)
6
2
N/mm
Number of cycles: 25 x 10
Tau (corr.)
2
N/mm
2
Nitrided
Not nitireded
Time of test:
24 h
2
Initial stress Tau (corr.) N/mm
Diagram 1 - Fatigue properties as nitrided/not nitrided.
Loss of load, %
Diagram 2 - Relaxation properties, nitrided/not nitrided springs.
June 2016
This information is subject to change (design, dimensions,
technical data, etc) without prior notice.
OTEVA® 76 SC/ OTEVA® 76 SC PLUS
Oil tempered SiCrVNi-alloyed high tensile valve spring wire
Only manufactured in USA and China
OTEVA 76 SC is a Super Clean steel, especially intended for the manufacture of clutch/transmission springs requiring high
fatigue properties and good relaxation properties at moderately increased working temperatures.
Manufactured as standard in shaved condition in sizes from Ø 2.00 mm to 6.00 mm, or in egg or elliptical shape corresponding to round cross section 2.50 mm to 6.00 mm. Other wire sizes on request.
OTEVA® 76 SC PLUS is intended for manufacture of valve springs and other springs requiring extremely high fatigue properties and good relaxation properties at increased working temperatures.
Chemical composition
C
%
Si
%
Mn
%
P max.
%
S max.
%
Cr
%
V
%
Ni
%
0.50 – 0.70
1.20 – 1.65
0.50 – 0.90
0.020
0.020
0.50 – 1.00
0.05 – 0.20
0.15 – 0.50
Physical properties
4)
Tolerance
± mm
Tensile strength
2
N/mm
Reduct. of area
min. %
Torsions
l=300 mm,
min. revs.
2.00 – 2.50
0.020
2110 – 2210
45
5
>2.50 – 3.20
0.020
2060 – 2160
45
5
>3.20 – 4.00
0.025
2010 – 2110
45
4
>4.00 – 5.00
0.025
1960 – 2060
45
3
>5.00 – 5.60
0.030
1910 – 2010
40
3
>5.60 – 6.00
0.035
1910 – 2010
40
3
1)
Size range
mm
2)
3)
1)
Other wire sizes on request.
2)
Ovality, i. e. the difference between the largest and smallest dimension of a cross section, is maximum half the tolerance range.
3)
Conversion from tensile strength to hardness values can be calculated in standard ISO EN 18265. The tensile strength R m within one
2
coil does not vary more than 50 N/mm .
4)
Torsion test is carried out for assessing deformability. The fracture of the torsion test piece shall be smooth and perpendicular to the
wire axis. The rupture shall show no longitudinal cracks.
Yield point
The proof stress Rp0.2 is min. 0.9 x tensile strength of the
wire.
E and G modulus
Modulus of elasticity, E:
Modulus of shear, G:
2
About 206 kN/mm
About 79.5 kN/mm2
Surface condition – non-destructive testing
In the standard size range 2.00 - 6.00 mm the wire is tested
continuously in Eddy Current equipment to a surface level
of > 40 microns. Other wire sizes on request.
Surface condition – End sample test
The wire is end sample tested by means of etch testing and
binocular inspection as well as microscopical inspection of
the material structure.
Max. permissible depth of partial surface decarburization
and surface defects, 1 % x wire diameter. In shaved condition; for diameters <=2 .00 mm 10 µm, for diameters > 2.00
mm 0.5% x d.
Cleanliness in steel
The presence of non-metallic inclusions in the wire rod is
inspected for every heat of OTEVA 76 SC in accordance
with the Suzuki Garphyttan method (or alternative max. Tmethod).
For OTEVA® 76 SC PLUS an additional extended inclusion
inspection applies.
Our criteria for releasing wire rod material for valve spring
wire are the following;
For wire rod samples: Inclusion size max. 15 µm in surface
area.
Inclusion size, surface
5–10
> 10–15
>15 µm
Max. number of inclusions 50
7
0
As stated by IVSWMA*, it is likely to find occasional inclusions in valve spring quality steel of a size larger than
15µm.
* IVSWMA: International Valve Spring Wire Manufacturers Association
June 2016
This information is subject to change (design, dimensions,
technical data, etc) without prior notice.
OTEVA® 76 SC/ OTEVA® 76 SC PLUS
Oil tempered SiCrVNi-alloyed high tensile valve spring wire
Delivery forms
Please contact site: South Bend USA or Suzhou China.
Heat treatment
As soon as possible after coiling, the springs should be
stress relieved.
Shot peening
In order to obtain optimum fatigue properties, the process time should be adjusted to get a complete treatment. Size of shots should be adapted to wire dimension, pitch and shot peening equipment.
Shot peening of the inside of the spring coils is particularly critical.
Hot presetting
After shot peening, the springs should be hot preset or
stress relieved. In order to reach optimum fatigue and
relaxation properties, the springs must be preset at an
appropriate stress.
Relaxation and fatigue properties
In diagram 1 the fatigue properties of this grade are
illustrated in a Goodman-diagram, based on a special
test spring design.
Spring conditions for fatigue and relaxation tests
(specially designed test spring) Diagram 1 and 2:
Wire diameter
Spring index
Ø 4.00 mm
6
Stress relieving
Temperature
Time
420 ±5°C (790 ±10 °F)
30 minutes
Shot peening (double shot
peening)
1st treatment
2nd treatment
Hardness of Shot-peening
grit (shot):
Aim for Almen arc-height
Speed 56 m/sec. for 20 minutes,
size of shots 0.8 mm
Speed 30 m/sec. for 10 minutes,
size of shots 0.8 mm
610-670 Hv
Min 0.45 mm
2
Hot presetting
1300 N/mm
(theoretically set)
Temperature
Time
200°C (max. 250°C)
10 minutes
Diagram 2 shows the relaxation properties (loss of
load) of springs made from OTEVA 76 SC wire subjected to static compression at different temperatures.
For further technical support, please contact Suzuki
Garphyttan.
Final stress Tau (corr.)
2
N/mm
Initial stress Tau (corr.)
2
N/mm
Number of cycles:
6
Time of test:
24 h
25 x 10
Loss of load, %
2
Initial stress Tau (corr.) N/mm
Diagram 1 - Fatigue properties
Diagram 2 - Relaxation properties
June 2016
This information is subject to change (design, dimensions,
technical data, etc) without prior notice.
OTEVA® 75 SC/ OTEVA® 75 SC PLUS
Oil tempered SiCrV-alloyed high tensile valve spring wire
OTEVA® 75 SC is a Super Clean steel, especially intended for the manufacture of clutch/ transmission springs with extremely high fatigue properties and good relaxation properties at moderately increased working temperatures.
Manufactured as standard in shaved condition in sizes from Ø 1.60 mm to 6.50 mm, or in egg or elliptical shape corresponding to round cross section 2.50 mm to 6.50 mm. Other wire sizes on request.
OTEVA® 75 SC PLUS is intended for manufacture of valve springs and other springs requiring extremely high fatigue properties and good relaxation properties at increased working temperatures.
Chemical composition
C
%
Si
%
Mn
%
P max.
%
0.50 – 0.70
1.20 – 1.65
0.50 – 0.80
0.020
S max.
%
Cr
%
V
%
0.020
0.50 – 1.00
0.05 – 0.20
Physical properties
4)
Tolerance
± mm
Tensile strength
2
N/mm
Reduct. of area
min. %
Torsions
l=300 mm,
min. revs.
1.60 – 2.00
0.020
2160 – 2260
45
5
>2.00 – 2.50
0.020
2110 – 2210
45
5
>2.50 – 3.20
0.020
2060 – 2160
45
5
>3.20 – 4.00
0.025
2010 – 2110
45
4
>4.00 – 5.00
0.025
1960 – 2060
45
3
>5.00 – 5.60
0.030
1910 – 2010
40
3
>5.60 – 6.00
0.035
1910 – 2010
40
3
>6.00 – 6.50
0.035
1910 – 2010
35
-
1)
Size range
mm
2)
3)
1)
Other wire sizes on request.
2)
Ovality, i. e. the difference between the largest and smallest dimension of a cross section, is maximum half the tolerance range.
3)
Conversion from tensile strength to hardness values can be calculated in standard ISO EN 18265. The tensile strength R m within one
2
coil does not vary more than 50 N/mm .
4)
Torsion test is carried out for assessing deformability. The fracture of the torsion test piece shall be smooth and perpendicular to the
wire axis. The rupture shall show no longitudinal cracks.
Yield point
The proof stress Rp0.2 is min. 0.9 x tensile strength of the
wire.
E and G modulus
2
Modulus of elasticity, E:
About 206 kN/mm
Modulus of shear, G:
About 79.5 kN/mm2
Surface condition – non-destructive testing
In the standard size range 2.00 - 6.00 mm the wire is tested
continuously in Eddy Current equipment to a surface level
of > 40 microns. Other wire sizes on request.
Surface condition – end sample test
The wire is end sample tested by means of etch testing and
binocular inspection as well as microscopical inspection of
the material structure.
Max. permissible depth of partial surface decarburization
and surface defects, 1 % x wire diameter. In shaved condition; for diameters <=2 .00 mm 10 µm, for diameters > 2.00
mm 0.5% x d.
Cleanliness in steel
The presence of non-metallic inclusions in the wire rod is
inspected for every heat of OTEVA® 75 SC in accordance
with the Suzuki Garphyttan method (or alternative max. Tmethod).
For OTEVA® 75 SC PLUS an additional extended inclusion
inspection applies.
Our criteria for releasing wire rod material for valve spring
wire are the following;
For wire rod samples: Inclusion size max. 15 µm in surface
area.
Inclusion size, surface
Max. number of inclusions
5–10
50
> 10–15
7
>15 µm
0
As stated by IVSWMA*, it is likely to find occasional inclusions in valve spring quality steel of a size larger than
15µm.
* IVSWMA: International Valve Spring Wire Manufacturers Association
June 2016
This information is subject to change (design, dimensions,
technical data, etc) without prior notice.
OTEVA® 75 SC/ OTEVA® 75 SC PLUS
Oil tempered SiCrV-alloyed high tensile valve spring wire
Delivery forms
See separate sheet.
Heat treatment
As soon as possible after coiling, the springs should be
stress relieved.
Shot peening
In order to obtain optimum fatigue properties, the process time should be adjusted to get a complete treatment. Size of shots should be adapted to wire dimension, pitch and shot peening equipment.
Shot peening of the inside of the spring coils is particularly critical.
Hot presetting
After shot peening, the springs should be hot preset or
stress relieved. In order to reach optimum fatigue and
relaxation properties, the springs must be preset at an
appropriate stress.
Relaxation and fatigue properties
In diagram 1 the fatigue properties of this grade are
illustrated in a Goodman-diagram, based on a special
test spring design.
Diagram 2 shows the relaxation properties (loss of
load) of springs made from OTEVA® 75 SC wire subjected to static compression at different temperatures.
Spring conditions for fatigue and relaxation tests
(specially designed test spring) Diagram 1 and 2:
Wire diameter
Spring index
Ø 4.00 mm
6
Stress relieving
Temperature
Time
420 ±5°C (790 ±10 °F)
30 minutes
Shot peening (double shot
peening)
1st treatment
2nd treatment
Hardness of Shot-peening
grit (shot):
Aim for Almen arc-height
Speed 56 m/sec. for 20 minutes,
size of shots 0.8 mm
Speed 30 m/sec. for 10 minutes,
size of shots 0.8 mm
610-670 Hv
Min 0.45 mm
2
Hot presetting
1300 N/mm
(theoretically set)
Temperature
Time
200°C (max. 250°C)
10 minutes
For further technical support, please contact Suzuki
Garphyttan.
Final stress Tau (corr.)
2
N/mm
Number of cycles:
Initial stress Tau (corr.)
2
N/mm
6
25 x 10
24 h
Loss of load, %
2
Initial stress Tau (corr.) N/mm
Diagram 1 - Fatigue properties
Time of test:
Diagram 2 - Relaxation properties
June 2016
This information is subject to change (design, dimensions,
technical data, etc) without prior notice.
OTEVA® 74 SC/ OTEVA® 74 SC PLUS
Oil tempered SiCr-alloyed high carbon valve spring wire
OTEVA® 74 SC is a Super Clean steel, especially intended for the manufacture of clutch/ transmission springs requiring
extremely high fatigue properties and good relaxation properties at moderately increased working temperatures.
Manufactured as standard in shaved condition in sizes from Ø 2.00 mm to 6.50 mm, or in egg or elliptical shape corresponding to round cross section 2.50 mm to 6.50 mm. Other wire sizes on request.
OTEVA® 74 SC PLUS is intended for manufacture of valve springs and other springs requiring extremely high fatigue properties and good relaxation properties at increased working temperatures.
Chemical composition
C
%
Si
%
Mn
%
P max.
%
S max.
%
Cr
%
0.60 – 0.70
1.20 – 1.65
0.50 – 0.80
0.025
0.025
0.50 – 1.00
Physical properties
1)
Size range
mm
2.00
2)
Tolerance
± mm
3)
Tensile strength
2
N/mm
Reduct. of area
min. %
0.020
2160 – 2260
40
>2.00 – 2.50
0.020
2110 – 2210
40
>2.50 – 3.20
0.020
2060 – 2160
40
>3.20 – 4.00
0.025
2010 – 2110
40
>4.00 – 5.00
0.025
1960 – 2060
35
>5.00 – 5.60
0.030
1910 – 2010
35
>5.60 – 6.50
0.035
1910 – 2010
35
1)
Other wire sizes on request.
2)
Ovality, i. e. the difference between the largest and smallest dimension of a cross section, is maximum half the tolerance range.
3)
Conversion from tensile strength to hardness values can be calculated in standard ISO EN 18265. The tensile strength R m within one
2
coil does not vary more than 50 N/mm .
Yield point
The proof stress Rp0.2 is min. 0.8 x tensile strength of the
wire.
E and G modulus
Modulus of elasticity, E:
Modulus of shear, G:
About 206 kN/mm2
About 79.5 kN/mm2
Surface condition – non-destructive testing
In the standard size range 2.00 - 6.00 mm the wire is tested
continuously in Eddy Current equipment to a surface level
of > 40 microns. Other wire sizes on request.
Surface condition – end sample test
The wire is end sample tested by means of etch testing and
binocular inspection as well as microscopical inspection of
the material structure.
Max. permissible depth of partial surface decarburization
and surface defects, 1 % x wire diameter. In shaved condition; for diameters <=2 .00 mm 10 µm, for diameters > 2.00
mm 0.5% x d.
Cleanliness in steel
The presence of non-metallic inclusions in the wire rod is
inspected for every heat of OTEVA® 74 SC in accordance
with the Suzuki Garphyttan method (or alternative max. Tmethod).
For OTEVA® 74 SC PLUS an additional extended inclusion
inspection applies.
Our criteria for releasing wire rod material for valve spring
wire are the following;
For wire rod samples: Inclusion size max. 15 µm in surface
area.
Inclusion size, surface
Max. number of inclusions
5–10
50
> 10–15
7
>15 µm
0
As stated by IVSWMA*, it is likely to find occasional inclusions in valve spring quality steel of a size larger than
15µm.
* IVSWMA: International Valve Spring Wire Manufacturers Association
June 2016
This information is subject to change (design, dimensions,
technical data, etc) without prior notice.
OTEVA® 74 SC/ OTEVA® 74 SC PLUS
Oil tempered SiCr-alloyed high carbon valve spring wire
Delivery forms
See separate sheet.
Heat treatment
As soon as possible after coiling, the springs should be
stress relieved.
Shot peening
In order to obtain optimum fatigue properties, the process time should be adjusted to get a complete treatment. Size of shots should be adapted to wire dimension, pitch and shot peening equipment.
Shot peening of the inside of the spring coils is particularly critical.
Hot presetting
After shot peening, the springs should be hot preset or
stress relieved. In order to reach optimum fatigue and
relaxation properties, the springs must be preset at an
appropriate stress.
Relaxation and fatigue properties
In diagram 1 the fatigue properties of this grade are
illustrated in a Goodman-diagram, based on a special
test spring design.
Diagram 2 shows the relaxation properties (loss of
load) of springs made from OTEVA® 74 SC wire subjected to static compression at different temperatures.
Spring conditions for fatigue and relaxation tests
(specially designed test spring) Diagram 1 and 2:
Wire diameter
Spring index
Ø 4.00 mm
6
Stress relieving
Temperature
Time
420 ±5°C (790 ±10 °F)
30 minutes
Shot peening (double shot
peening)
1st treatment
2nd treatment
Hardness of Shot-peening
grit (shot):
Aim for Almen arc-height
Speed 56 m/sec. for 20 minutes,
size of shots 0.8 mm
Speed 30 m/sec. for 10 minutes,
size of shots 0.8 mm
610-670 Hv
Min 0.45 mm
2
Hot presetting
1300 N/mm
(theoretically set)
Temperature
Time
200°C (max. 250°C)
10 minutes
For further technical support, please contact Suzuki
Garphyttan.
Final stress Tau (corr.)
2
N/mm
Number of cycles:
Initial stress Tau (corr.)
2
N/mm
6
25 x 10
24 h
Loss of load, %
2
Initial stress Tau (corr.) N/mm
Diagram 1 - Fatigue properties
Time of test:
Diagram 2 - Relaxation properties
June 2016
This information is subject to change (design, dimensions,
technical data, etc) without prior notice.
OTEVA® 70 SC/ OTEVA® 70 SC PLUS
Oil tempered SiCr-alloyed valve spring wire
OTEVA® 70 SC is a Super Clean steel, especially intended for the manufacture of clutch/ transmission springs with extremely high fatigue
properties and good relaxation properties at moderately increased working temperature.
The wire is manufactured in shaved or unshaved condition (Ø 6.50 – 14.00 mm in unshaved condition subcontracted) in sizes from Ø 0.50
mm to 6.50 mm, or in egg or elliptical shape corresponding to round cross section 2.50 mm to 6.50 mm. Other wire sizes on request.
OTEVA® 70 SC PLUS is intended for manufacture of valve springs and other springs requiring extremely high fatigue properties and good
relaxation properties at increased working temperatures.
Chemical composition
C
%
Si
%
Mn
%
P max
%
0.50 – 0.60
1.20 – 1.60
0.50 – 0.80
0.025
S max
%
Cr
%
0.020
0.50 – 0.80
4)
Physical properties
1)
Size range
mm
Tolerance
± mm
2)
Tensile strength
2
N/mm
3)
Reduct. of area
min. %
Torsions
l=300 mm,
min. revs.
0.50 – 0.80
0.010
2080 – 2210
–
6
>0.80 – 1.30
0.015
2080 – 2210
50
5
>1.30 – 1.40
0.015
2080 – 2210
50
5
>1.40 – 1.60
0.020
2080 – 2210
50
5
>1.60 – 2.00
0.020
2010 – 2160
50
5
>2.00 – 2.50
0.020
1960 – 2060
50
5
>2.50 – 3.00
0.020
1910 – 2010
50
4
>3.00 – 3.20
0.020
1910 – 2010
45
4
>3.20 – 3.50
0.025
1910 – 2010
45
4
>3.50 – 4.50
0.025
1860 – 1960
45
4
>4.50 – 5.00
0.025
1810 – 1910
45
3
>5.00 – 5.60
0.030
1810 – 1910
40
3
>5.60 – 6.00
0.035
1760 – 1860
40
3
>6.00 – 6.50
0.035
1760 – 1860
40
–
1)
2)
3)
4)
Other wire sizes on request.
Ovality, i. e. the difference between the largest and smallest dimension of a cross section, is maximum half the tolerance range.
Conversion from tensile strength to hardness values can be calculated in standard ISO EN 18265. The tensile strength R m within one
2
coil does not vary more than 50 N/Mm .
Torsion test is carried out for assessing deformability. The fracture of the torsion test piece shall be smooth and perpendicular to the
wire axis. The rupture shall show no longitudinal cracks.
Yield point
The proof stress Rp0.2 is min. 0.9 x tensile strength of the
wire.
E and G modulus
2
Modulus of elasticity, E: About 206 kN/mm
2
Modulus of shear, G: About 79.5 kN/mm
Surface condition – non-destructive testing
In the standard size range 2.00 - 6.00 mm the wire is tested
continuously in Eddy Current equipment to a surface level
of > 40 microns. Other wire sizes on request.
Surface condition – end sample test
The wire is end sample tested by means of etch testing and binocular inspection as well as microscopical
inspection of the material structure.
Max. permissible depth of partial surface decarburization
and surface defects, 1 % x wire diameter. In shaved condition; for diameters <=2 .00 mm 10 µm, for diameters > 2.00
mm 0.5% x d.
Cleanliness in steel
The presence of non-metallic inclusions in the wire rod is
inspected for every heat of OTEVA® 70 SC in accordance
with the Suzuki Garphyttan method (or alternative max. Tmethod).
For OTEVA® 70 SC PLUS an additional extended inclusion
inspection applies.
Our criteria for releasing wire rod material for valve spring
wire are the following; For wire rod samples: Inclusion size
max. 15 µm in surface area.
Inclusion size, surface
Max. number of incl.
5–10
>10–15
>15 µm
50
7
0
As stated by IVSWMA*, it is likely to find occasional inclusions in valve spring quality steel of a size larger than
15µm.
* IVSWMA: International Valve Spring Wire Manufacturers Association
June 2016
This information is subject to change (design, dimensions,
technical data, etc) without prior notice.
OTEVA® 70 SC/ OTEVA® 70 SC PLUS
Oil tempered SiCr-alloyed valve spring wire
Delivery forms
See separate sheet.
Heat treatment
As soon as possible after coiling, the springs should be
stress relieved.
Shot peening
In order to obtain optimum fatigue properties, the process time should be adjusted to get a complete treatment. Size of shots should be adapted to wire dimension, pitch and shot peening equipment.
Shot peening of the inside of the spring coils is particularly critical.
Spring conditions for fatigue and relaxation tests
(specially designed test spring) Diagram 1 and 2:
Wire diameter
Spring index
Ø 4,00 mm
6
Stress relieving
Temperature
Time
420 ±5°C (790 ±10 °F)
30 minutes
Hot presetting
After shot peening, the springs should be hot preset or
stress relieved. In order to reach optimum fatigue and
relaxation properties, the springs must be preset at an
appropriate stress.
Shot peening
Relaxation and fatigue properties
In diagram 1 the fatigue properties of this grade are
illustrated in a Goodman-diagram, based on a special
test spring design.
Hot presetting
1200 N/mm
(theoretically set)
Temperature
Time
200°C (max. 250°C)
10 minutes
Hardness of Shot-peening
grit (shot):
Aim for Almen arc-height
Speed 48 m/sec. for 20 minutes,
size of shots 0.8 mm
610-670 Hv
Min. 0.40-0.45 mm
2
Diagram 2 shows the relaxation properties (loss of load)
of springs made from OTEVA® 70 SC wire subjected to
static compression at different temperatures.
For further technical support, please contact Suzuki
Garphyttan.
Final stress Tau (corr.)
2
N/mm
Initial stress Tau (corr.)
2
N/mm
Number of cycles:
6
25 x 10
2
24 h
Loss of load, %
Initial stress Tau (corr.) N/mm
Diagram 1 - Fatigue properties
Time of test:
Diagram 2 - Relaxation properties
June 2016
This information is subject to change (design, dimensions,
technical data, etc) without prior notice.
SWOSC-VHV
Oil tempered SiCrV-alloyed high tensile valve spring wire
Only manufactured in China
SWOSC-VHV is a Super Clean steel, especially intended for the manufacture of valve springs and other springs requiring
high fatigue properties and good relaxation properties at moderately increased working temperatures.
The wire is manufactured in shaved condition in sizes from Ø 1.60 mm to 6.50 mm, or in egg or elliptical shape (corresponding to round cross section 2.50 mm to 6.50 mm). Other wire sizes on request.
Chemical composition
C
%
Si
%
Mn
%
0.50 – 0.70
1.20 – 1.65
0.50 – 0.80
P max.
%
0.020
S max.
%
Cr
%
V
%
0.020
0.50 – 1.00
0.05 – 0.20
Physical properties
4)
1)
Size range
mm
2)
Tolerance
± mm
3)
Tensile strength
N/mm2
Reduct. of area
min. %
Torsions
l=300 mm,
min. revs.
1.60 – 2.00
0.020
2180 – 2280
45
5
>2.00 – 2.50
0.020
2110 – 2210
45
5
>2.50 – 3.20
0.020
2060 – 2160
45
5
>3.20 – 4.00
0.025
2010 – 2110
45
4
>4.00 – 5.00
0.025
1960 – 2060
45
3
>5.00 – 5.60
0.030
1910 – 2010
40
3
>5.60 – 6.00
0.035
1910 – 2010
40
3
>6.00 – 6.50
0.035
1910 – 2010
35
–
1)
Other wire sizes on request.
2)
Ovality, i. e. the difference between the largest and smallest dimension of a cross section, is maximum half the tolerance range.
3)
Conversion from tensile strength to hardness values can be calculated in standard ISO EN 18265. The tensile strength R m within one
2
coil does not vary more than 50 N/mm .
4)
Torsion test is carried out for assessing deformability. The fracture of the torsion test piece shall be smooth and perpendicular to the
wire axis. The rupture shall show no longitudinal cracks.
Yield point
The proof stress Rp0.2 is min. 0.9 x tensile strength of the
wire.
E and G modulus
Modulus of elasticity, E: About 206 kN/mm2
2
Modulus of shear, G: About 79.5 kN/mm
Surface condition – non-destructive testing
In the standard size range 2.00 - 6.00 mm the wire is tested
continuously in Eddy Current equipment to a surface level of
> 40 microns. Other wire sizes on request.
Surface condition – end sample test
The wire is end sample tested by means of etch testing and
binocular inspection as well as microscopical inspection of
the material structure.
Max. permissible depth of partial surface decarburization
and surface defects, 1 % x wire diameter. In shaved condition; for diameters <=2 .00 mm 10 µm, for diameters > 2.00
mm 0.5% x d.
Cleanliness in steel
The presence of non-metallic inclusions in the wire rod is
inspected for every heat in accordance with the Suzuki
Garphyttan method (or alternative max. T-method).
Our criteria for releasing wire rod material for valve spring
wire are the following;
For wire rod samples: Inclusion size max. 15 µm in surface
area.
Inclusion size, surface
Max. number of incl.
5–10
>10–15
>15 µm
50
7
0
As stated by IVSWMA*, it is likely to find occasional inclusions in valve spring quality steel of a size larger than 15µm.
* IVSWMA: International Valve Spring Wire Manufacturers Association
August 2014
This information is subject to change (design, dimensions,
technical data, etc) without prior notice.
SWOSC-VHV
Oil tempered SiCrV-alloyed high tensile valve spring wire
Spring conditions for fatigue and relaxation tests
(specially designed test spring) Diagram 1 and 2:
Delivery forms
See separate sheet.
Heat treatment
As soon as possible after coiling, the springs should be
stress relieved.
Shot peening
In order to obtain optimum fatigue properties, the process
time should be adjusted to get a complete treatment. Size of
shots should be adapted to wire dimension, pitch and shot
peening equipment.
Shot peening of the inside of the spring coils is particularly
critical.
Hot presetting
After shot peening, the springs should be hot preset or
stress relieved. In order to reach optimum fatigue and relaxation properties, the springs must be preset at an appropriate stress.
Relaxation and fatigue properties
In diagram 1 the fatigue properties of this grade are illustrated in a Goodman-diagram, based on a special test spring
design.
Wire diameter
Spring index
Ø 4.00 mm
6
Stress relieving
Temperature
Time
420 ±5°C (790 ±10 °F)
30 minutes
Shot peening (double
shot peening)
1st treatment
2nd treatment
Hardness of Shot-peening
grit (shot):
Aim for Almen arc-height
Speed 56 m/sec. for 20
minutes,
size of shots 0.8 mm
Speed 30 m/sec. for 10
minutes,
size of shots 0.8 mm
610-670 Hv
Min 0.45 mm
2
Hot presetting
1300 N/mm
(theoretically set)
Temperature
Time
200°C (max. 250°C)
10 minutes
Diagram 2 shows the relaxation properties (loss of load) of
springs made from SWOSC-VHV wire subjected to static
compression at different temperatures.
For further technical support, please contact Suzuki Garphyttan.
Final stress Tau (corr.)
2
N/mm
Initial stress Tau (corr.)
2
N/mm
Number of cycles:
6
Time of test:
25 x 10
24 h
Loss of load, %
2
Initial stress Tau (corr.) N/mm
Diagram 1 - Fatigue properties
Diagram 2 - Relaxation properties
August 2014
This information is subject to change (design, dimensions,
technical data, etc) without prior notice.
SWOSC-V
Oil tempered SiCr-alloyed valve spring wire
Only manufactured in China
SWOSC-V is a Super Clean steel, especially intended for the manufacture of valve springs and other springs requiring high
fatigue properties and good relaxation properties at moderately increased working temperature.
The wire is manufactured in shaved condition in sizes from Ø 1.60 mm to 6.50 mm, or in egg or elliptical shape (corresponding to round cross section 2.50 mm to 6.50 mm). Other wire sizes on request.
Chemical composition
C
%
Si
%
Mn
%
P max
%
0.50 – 0.60
1.20 – 1.60
0.50 – 0.80
0.025
S max
%
Cr
%
0.020
0.50 – 0.80
Physical properties
4)
1)
Size range
mm
2)
3)
Tolerance
± mm
Tensile strength
N/mm2
Reduct. of area
min. %
Torsions
l=300 mm,
min. revs.
1.60 – 2.00
0.020
2010 – 2160
50
5
>2.00 – 2.50
0.020
1960 – 2060
50
5
>2.50 – 3.00
0.020
1910 – 2010
50
4
>3.00 – 3.20
0.020
1910 – 2010
45
4
>3.20 – 3.50
0.025
1910 – 2010
45
4
>3.50 – 4.50
0.025
1860 – 1960
45
4
>4.50 – 5.00
0.025
1810 – 1910
45
3
>5.00 – 5.60
0.030
1810 – 1910
40
3
>5.60 – 6.00
0.035
1760 – 1860
40
3
>6.00 – 6.50
0.035
1760 – 1860
40
–
1)
Other wire sizes on request.
2)
Ovality, i. e. the difference between the largest and smallest dimension of a cross section, is maximum half the tolerance range.
3)
Conversion from tensile strength to hardness values can be calculated in standard ISO EN 18265. The tensile strength R m within one
2
coil does not vary more than 50 N/mm .
4)
Torsion test is carried out for assessing deformability. The fracture of the torsion test piece shall be smooth and perpendicular to the
wire axis. The rupture shall show no longitudinal cracks.
Yield point
The proof stress Rp0.2 is min. 0.9 x tensile strength of the
wire.
E and G modulus
2
Modulus of elasticity, E: About 206 kN/mm
Modulus of shear, G: About 79.5 kN/mm2
Surface condition – Non-destructive testing
In the standard size range 2.00 - 6.00 mm the wire is tested
continuously in Eddy Current equipment to a surface level
of > 40 microns. Other wire sizes on request.
Surface condition – end sample test
The wire is end sample tested by means of etch testing and
binocular inspection as well as microscopical inspection of
the material structure.
Max. permissible depth of partial surface decarburization
and surface defects, 1 % x wire diameter. In shaved condi-
tion; for diameters <=2 .00 mm 10 µm, for diameters > 2.00
mm 0.5% x d.
Cleanliness in steel
The presence of non-metallic inclusions in the wire rod is
inspected for every heat in accordance with the Suzuki
Garphyttan method (or alternative max. T-method).
Our criteria for releasing wire rod material for valve spring
wire are the following;
For wire rod samples: Inclusion size max. 15 µm in surface
area.
Inclusion size, surface
Max. number of incl.
5–10
>10–15
>15 µm
50
7
0
As stated by IVSWMA*, it is likely to find occasional inclusions in valve spring quality steel of a size larger than
15µm.
* IVSWMA: International Valve Spring Wire Manufacturers Association
August 2014
This information is subject to change (design, dimensions,
technical data, etc) without prior notice.
SWOSC-V
Oil tempered SiCr-alloyed valve spring wire
Spring conditions for fatigue and relaxation tests
(specially designed test spring) Diagram 1 and 2:
Delivery forms
Please contact site: Suzhou China
Heat treatment
As soon as possible after coiling, the springs should be
stress relieved.
Shot peening
In order to obtain optimum fatigue properties, the process
time should be adjusted to get a complete treatment. Size
of shots should be adapted to wire dimension, pitch and
shot peening equipment.
Shot peening of the inside of the spring coils is particularly
critical.
Hot presetting
After shot peening, the springs should be hot preset or
stress relieved. In order to reach optimum fatigue and relaxation properties, the springs must be preset at an appropriate stress.
Wire diameter
Spring index
Ø 4,00 mm
6
Stress relieving
Temperature
Time
420 ±5°C (790 ±10 °F)
30 minutes
Shot peening
Hardness of Shot-peening
grit (shot):
Aim for Almen arc-height
Hot presetting
(theoretically set)
Temperature
Time
Speed 48 m/sec. for 20 minutes,
size of shots 0.8 mm
610-670 Hv
Min. 0.40-0.45 mm
2
1200 N/mm
200°C (max. 250°C)
10 minutes
Relaxation and fatigue properties
In diagram 1 the fatigue properties of this grade are illustrated in a Goodman-diagram, based on a special test
spring design.
Diagram 2 shows the relaxation properties (loss of load) of
springs made from SWOSC-V wire subjected to static compression at different temperatures.
For further technical support, please contact Suzuki
Garphyttan.
Final stress Tau (corr.)
2
N/mm
Number of cycles:
Initial stress Tau (corr.)
2
N/mm
6
25 x 10
Time of test:
24 h
2
Initial stress Tau (corr.) N/mm
Loss of load, %
Diagram 1 - Fatigue properties
Diagram 2 - Relaxation properties
August 2014
This information is subject to change (design, dimensions,
technical data, etc) without prior notice.
75 KD / 75 KD S
Oil tempered SiCrV-alloyed clutch and transmission spring wire
75 KD is especially intended for the manufacture of clutch and transmission springs and similar moderately high fatigue
stressed springs.
75 KD S is a shaved version of 75 KD intended for applications with higher surface requirements.
The material has good relaxation properties. The wire is manufactured in sizes from Ø 1.60 to 7.00 mm. Other wire sizes on
request.
Chemical composition
C
%
Si
%
Mn
%
P max
%
S max
%
Cr
%
V
%
0.50 – 0.70
1.20 – 1.65
0.50 – 0.80
0.025
0.020
0.50 – 1.00
0,05 – 0.20
Physical properties
1)
Size range
mm
Torsions
2)
3)
4)
Tolerance
± mm
Tensile strength
2
N/mm
Reduct. of area
min. %
l=300 mm,
min. revs.
1.60 – 2.00
0.020
2160 – 2310
45
5
>2.00 – 2.50
0.020
2110 – 2210
45
5
>2.50 – 3.20
0.020
2060 – 2160
45
4
>3.20 – 4.00
0.025
2010 – 2110
45
4
>4.00 – 5.00
0.025
1960 – 2060
45
4
>5.00 – 5.60
0.030
1910 – 2010
40
4
>5.60 – 6.00
0.035
1910 – 2010
40
3
>6.00 – 6.50
0.035
1910 – 2010
40
–
>6.50 – 7.00
0.035
1860 – 2010
40
–
1)
Other wire sizes on request.
2)
Ovality, i. e. the difference between the largest and smallest dimension of a cross section, is maximum half the tolerance range.
Conversion from tensile strength to hardness values can be calculated in standard ISO EN 18265. The tensile strength R m within one
2
coil does not vary more than 60 N/mm .
3)
4)
Torsion test is carried out for assessing deformability. The fracture of the torsion test piece shall be smooth and perpendicular to the
wire axis. The rupture shall show no longitudinal cracks.
Yield point
The proof stress Rp0.2 is min. 0.9 x tensile strength of the
wire.
E and G modulus
Modulus of elasticity, E: About 206 kN/mm2
Modulus of shear, G:
About 79.5 kN/mm2
Surface condition – non-destructive testing
In the standard size range 2.00 - 6.00 mm the wire is tested
continuously in Eddy Current equipment; for 75 KD a level of
60 microns and for 75 KD S of 40 microns.
Surface condition – end sample test
The wire is end sample tested by means of etch testing and
binocular inspection as well as microscopical inspection of
the material structure.
Max. permissible depth of partial surface decarburization
and surface defects, 1.3% x wire diameter. No complete
decarburization allowed.
Cleanliness in steel – non-metallic inclusions
Max. level 2 according to DIN 50602-M.
Corresponding standard: ASTM E-45-A.
Heat treatment
As soon as possible after coiling, the springs should be
stress relieved.
Shot peening
In order to obtain optimum fatigue properties, the process
time should be adjusted to get a complete treatment. Size of
shots should be adapted to wire dimension, pitch and shot
peening equipment. Shot peening of the inside of the spring
coils is particularly critical.
Hot presetting
After shot peening, the springs should be hot preset or
stress relieved. In order to reach optimum fatigue and relaxation properties, the springs must be preset at an appropriate stress.
Delivery forms
See separate sheet.
June 2016
This information is subject to change (design, dimensions,
technical data, etc) without prior notice.
70 KD / 70 KD S
Oil tempered SiCr-alloyed clutch and transmission spring wire
70 KD is especially intended for the manufacture of clutch and transmission springs and similar moderately high fatigue
stressed springs.
70 KD S is a shaved version of 70 KD intended for applications with higher surface requirements.
The material has good relaxation properties. The wire is manufactured in sizes from Ø 0.50 to 7.00 mm. Other wire sizes on
request.
Chemical composition
C
%
Si
%
Mn
%
P max
%
S max
%
0.50 – 0.60
1.20 – 1.60
0.50 – 0.80
0.025
0.020
Physical properties
1)
Size range
mm
Cr
%
0.50 – 0.80
Torsions
2)
3)
Tolerance
± mm
Tensile strength
2
N/mm
Reduct. of area
min. %
0.50 – 0.80
0.010
2080 – 2210
–
6
>0.80 – 1.30
0.015
2080 – 2210
50
5
>1.30 – 1.40
0.015
2080 – 2210
50
5
>1.40 – 1.60
0.020
2080 – 2210
50
5
>1.60 – 2.00
0.020
2010 – 2160
50
5
>2.00 – 2.50
0.020
1960 – 2060
50
5
>2.50 – 3.00
0.020
1910 – 2010
50
4
>3.00 – 3.20
0.020
1910 – 2010
45
4
>3.20 – 3.50
0.025
1910 – 2010
45
4
>3.50 – 4.50
0.025
1860 – 1960
45
4
>4.50 – 5.00
0.025
1810 – 1910
45
3
>5.00 – 5.60
0.030
1810 – 1910
40
3
>5.60 – 6.00
0.035
1760 – 1860
40
3
>6.00 – 7.00
0.035
1760 – 1860
40
–
4)
l=300 mm,
min. revs.
1)
Other wire sizes on request.
2)
Ovality, i. e. the difference between the largest and smallest dimension of a cross section, is maximum half the tolerance range.
Conversion from tensile strength to hardness values can be calculated in standard ISO EN 18265. The tensile strength R m within one
2
coil does not vary more than 60 N/mm .
Torsion test is carried out for assessing deformability. The fracture of the torsion test piece shall be smooth and perpendicular to the
wire axis. The rupture shall show no longitudinal cracks.
3)
4)
Yield point
The proof stress Rp0.2 is min. 0.9 x tensile strength of the
wire.
E and G modulus
2
Modulus of elasticity, E: About 206 kN/mm
Modulus of shear, G:
About 79.5 kN/mm2
Surface condition – non-destructive testing
In the standard size range 2.00 - 6.00 mm the wire is tested
continuously in Eddy Current equipment ; for 70 KD a level
of 60 microns and for 70 KD S of 40 microns.
Surface condition – end sample test
The wire is end sample tested by means of etch testing and
binocular inspection as well as microscopical inspection of
the material structure.
Max. permissible depth of partial surface decarburization
and surface defects, 1.3% x wire diameter. No complete
decarburization allowed.
Cleanliness in steel – non-metallic inclusions
Max. level 2 according to DIN 50602-M.
Corresponding standard: ASTM E-45-A.
Heat treatment
As soon as possible after coiling, the springs should be
stress relieved.
Shot peening
In order to obtain optimum fatigue properties, the process
time should be adjusted to get a complete treatment. Size of
shots should be adapted to wire dimension, pitch and shot
peening equipment. Shot peening of the inside of the spring
coils is particularly critical.
Hot presetting
After shot peening, the springs should be hot preset or
stress relieved. In order to reach optimum fatigue and relaxation properties, the springs must be preset at an appropriate stress.
Delivery forms
See separate sheet.
June 2016
This information is subject to change (design, dimensions,
technical data, etc) without prior notice.
STATO 75
Oil tempered SiCrV-alloyed spring wire
STATO 75 is especially intended for the manufacture of springs exposed to static or moderately high fatigue stresses. The
material has good relaxation properties.
The wire is manufactured in sizes from Ø 2.00 mm to 7.00 mm. Other wire sizes on request.
Chemical composition
C
%
Si
%
Mn
%
P max
%
S max
%
Cr
%
V
%
0.50 – 0.70
1.20 – 1.65
0.50 – 0.80
0.025
0.025
0.50 – 1.00
0.05 – 0.20
Physical properties
Size range
mm
1)
Tolerance
± mm
2)
3)
Tensile strength
2
N/mm
Reduct of area
min. %
2.00 – 2.50
0.020
2110 – 2210
45
>2.50 – 3.20
0.020
2060 – 2160
45
>3.20 – 4.00
0.025
2010 – 2110
45
>4.00 – 5.00
0.025
1960 – 2060
45
>5.00 – 5.60
0.030
1910 – 2010
40
>5.60 – 6.50
0.035
1910 – 2010
40
>6.50 – 7.00
0.035
1860 – 2010
40
1)
2)
3)
Other wire sizes on request.
Ovality, i. e. the difference between the largest and smallest dimension of a cross section, is maximum half the tolerance range.
Conversion from tensile strength to hardness values can be calculated in standard ISO EN 18265. The tensile strength R m within one
2
coil does not vary more than 70 N/mm .
Yield point
The proof stress Rp0.2 is min. 0.9 x tensile strength of the
wire.
E and G modulus
2
Modulus of elasticity, E:
About 206 kN/mm
Modulus of shear, G:
About 79.5 kN/mm2.
Surface condition – end sample test
The wire is end sample tested by means of etch testing and
binocular inspection as well as microscopical inspection of
the material structure.
Max. permissible depth of partial surface decarburization
and surface defects, 1.5% x wire diameter. No complete
decarburization allowed.
Cleanliness in steel, non-metallic inclusions
Max. level 2 according to DIN 50602-M.
Corresponding standard: ASTM E-45-A.
Heat treatment
As soon as possible after coiling, the springs should be
stress relieved.
Shot peening
In order to obtain optimum fatigue properties, the process
time should be adjusted to get a complete treatment. Size of
shots should be adapted to wire dimension, pitch and shot
peening equipment. Shot peening of the inside of the spring
coils is particularly critical.
Hot presetting
After shot peening, the springs should be hot preset or
stress relieved. In order to reach optimum fatigue and relaxation properties, the springs must be preset at an appropriate stress.
Delivery forms
See separate sheet.
August 2014
This information is subject to change (design, dimensions,
technical data, etc) without prior notice.
STATO 70
Oil tempered SiCr-alloyed spring wire
STATO 70 is especially intended for the manufacture of springs exposed to static or moderately high fatigue stresses. The
material has good relaxation properties.
The wire is manufactured in sizes from Ø 0.50 mm to 7.00 mm. Other wire sizes on request.
Chemical composition
C
%
Si
%
Mn
%
P max
%
0.50 – 0.60
1.20 – 1.60
0.50 – 0.80
0.025
S max
%
Cr
%
0.025
0.50 – 0.80
Physical properties
Size range
mm
2)
Tolerance1)
± mm
Tensile strength
2
N/mm
0.50 – 0.80
0.010
2100 – 2300
–
>0.80 – 1.00
0.015
2100 – 2300
50
>1.00 – 1.40
0.020
2060 – 2260
50
>1.40 – 1.60
0.020
2040 – 2220
50
>1.60 – 2.00
0.025
2000 – 2180
50
>2.00 – 2.50
0.025
1970 – 2140
50
>2.50 – 2.70
0.025
1950 – 2120
50
>2.70 – 3.00
0.030
1910 – 2100
50
>3.00 – 3.50
0.030
1900 – 2060
45
>3.50 – 4.00
0.030
1870 – 2030
45
>4.00 – 4.50
0.035
1860 – 2020
45
>4.50 – 5.00
0.035
1830 – 1980
45
>5.00 – 5.60
0.035
1800 – 1950
40
>5.60 – 6.50
0.040
1780 – 1930
40
>6.50 – 7.00
0.040
1740 – 1890
35
1)
2)
3)
Reduct of area
min. %
Other wire sizes on request.
Ovality, i. e. the difference between the largest and smallest dimension of a cross section, is maximum half the tolerance range.
Conversion from tensile strength to hardness values can be calculated in standard ISO EN 18265. The tensile strength R m within one
2
coil does not vary more than 70 N/mm .
Yield point
The proof stress Rp0.2 is min. 0.9 x tensile strength of the
wire.
E and G modulus
Modulus of elasticity, E:
Modulus of shear, G:
2
About 206 kN/mm
About 79.5 kN/mm2.
Surface condition – end sample test
The wire is end sample tested by means of etch testing and
binocular inspection as well as microscopical inspection of
the material structure.
Max. permissible depth of partial surface decarburization
and surface defects, 1.5% x wire diameter. No complete
decarburization allowed.
Cleanliness in steel, non-metallic inclusions
Max. level 2 according to DIN 50602-M.
Corresponding standard: ASTM E-45-A.
Heat treatment
As soon as possible after coiling, the springs should be
stress relieved.
Shot peening
In order to obtain optimum fatigue properties, the process
time should be adjusted to get a complete treatment. Size
of shots should be adapted to wire dimension, pitch and
shot peening equipment. Shot peening of the inside of the
spring coils is particularly critical.
Hot presetting
After shot peening, the springs should be hot preset or
stress relieved. In order to reach optimum fatigue and relaxation properties, the springs must be preset at an appropriate stress.
Delivery forms
See separate sheet.
August 2014
This information is subject to change (design, dimensions,
technical data, etc) without prior notice.
Addresses
Production Sites
USA
Suzuki Garphyttan Corp.
4404 Nimtz Parkway
South Bend, IN 46628
USA
Tel +1 574 232 8800
Fax +1 574 232 2565
Email info.us@sg-wire.com
Sweden
Suzuki Garphyttan AB
(Bruksvägen 3)
SE-719 80 Garphyttan
Sweden
Tel +46 (0)19 295 100
Fax +46 (0)19 295 101
Email info.se@sg-wire.com
www.suzuki-garphyttan.com
Mexico
Suzuki Garphyttan, S.A. de C.V.
Av. Santa Fe No. 3
Parque Industrial Opción
Carretera Federal No. 57 (Qro – SLP) Km 57.8
San José Iturbide, Guanajuato, C.P. 37980
Mexico
Tel +52 (442) 153 5560 / +1 630 981 1212
Email info.mx@sg-wire.com
USA
Suzuki Garphyttan Corp.
4404 Nimtz Parkway
South Bend, IN 46628
USA
Tel +1 574 232 8800
Fax +1 574 232 2565
Email info.us@sg-wire.com
China
Suzuki Garphyttan Wire (Suzhou) Co. Ltd.
Building B, No 6 Longpu Road
SIP, Suzhou 215126
P.R. China
Tel +86 512 8885 5361
Fax +86 512 8885 5366
Email info.cn@sg-wire.com
Mexico
Suzuki Garphyttan, S.A. de C.V.
Av. Santa Fe No. 3
Parque Industrial Opción
Carretera Federal No. 57 (Qro – SLP) Km 57.8
San José Iturbide, Guanajuato, C.P. 37980
Mexico
Tel +52 (442) 153 5560 / +1 630 981 1212
Email info.mx@sg-wire.com
Sales Offices
Sweden
Suzuki Garphyttan AB
(Bruksvägen 3)
SE-719 80 Garphyttan
Sweden
Tel +46 (0)19 295 100
Fax +46 (0)19 295 101
Email info.se@sg-wire.com
www.suzuki-garphyttan.com
China
Suzuki Garphyttan Wire (Suzhou) Co. Ltd.
Building B, No 6 Longpu Road
SIP, Suzhou 215126
P.R. China
Tel +86 512 8885 5361
Fax +86 512 8885 5366
Email info.cn@sg-wire.com
Sales Representatives/Distributors/Re-sellers
Brazil
UBRASTEEL TRADING LTDA
Rua Vieira de Morais, 420 - conj 92 - Campo Belo
BR - CEP 04617-000 - Sao Paulo - SP
Brazil
Tel +55 11 5536 9540
Fax +55 11 5093 1131
Email info@ubrasteel.com.br, vendas@ubrasteel.com.br,
ole.bergh@ubrasteel.com.br
Great Britain
STRIDE SUPPLIES LTD
Unit 7, Lakeside Industrial Estate
Broad Ground Road
GB-B98 8YP Redditch, Worcs.
England
Tel +44 01527 500170
Fax +44 01527 505652
Email info@stride-supplies.co.uk
Korea
JOIL STEEL Co
#919, AceHitechcity2
Seonyu-ro 13-gil 25
Yeongdeungpo-gu
Seoul
Korea
Tel +82-2-761-2028
Fax +82-2-761-2029
Email joilsteel@kita.net
Germany
Suzuki Garphyttan GmbH
Postfach 102541
DE-40016 Düsseldorf
Germany
Tel +49 (0)211/92304-0
Fax +49 (0)211/92304-40
Email info.se@sg-wire.com
www.suzuki-garphyttan.de
May 2017
This information is subject to change (design, dimensions,
technical data, etc) without prior notice.