1
1. Foreword
Since the magnetic steel coils had been produced in 1993, CSC had invested
more resources to proceed many research programs in order to develop new production technology. As a result, not only the capacity had greatly been increased but
many high grade products developed successfully. CSC ensures a stable supply of
high quality non-oriented magnetic stell coil to satisfy the requirements of customers’.
Magnetic steel coils are a kind of cold rolled steel with special electrical and
magnetic properties. Because the silicon was added, magnetic steel previously was
called”silicon steel”. Magnetic steel is classified into grain-oriented and non-oriented by their texture structure. Currently only non-oriented steel sheets are available
from China Steel.
This catalog details general information such as the features, applications, specifications, and other relevant product properties of the magnetic steel coils manufactured by China Strrl. It serves to help downstream users to understand their materials properties.
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2. Features and Applications
Because non-oriented magnetic steel has the features of uniform electrical and
magnetic properties, it is the most suitable material for rotating machines. Generally the magnetic steel coils are required to process the following major properties,
include iron loss, magnetic flux density, punchability, weldability, flatness, thickness
uniformity and etc. China Steel endeavors continuously not only to improve the
magnetic properties, but also to develop new coating film. So far its Products have
been well accepted and widely used by downstream users. As for the applications of
2
various grades, please refer to the following Table 1.
Table1: Product Designations and Applications
Applications
Grade
25CS
35CS
35CS
Large rotating machines
○
Medium rotating machines
Rotating
Machines
50CS
○
○
○
○
○
○
○
○
○
○
○
○
○
Audio transformers
○
○
Welding transformers
○
General use A-C motors
○
Hermetically sealed motors
○
Small & medium power
transformers
Ballast
Magnetic switch cores
50CS
○
○
Service A-C motors
Machines
50CS
○
Small motors & intermittent
Static
50CS
1500HF 210~300 440~550 230~350 400~470 600~800 1000~1300
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
3
3. Specification
Although the quality of non-oriented magnetic steel coils had been modified
and named with the notations of China Steel, but these steel coils completely comform with the requirements of CNS 7217 and C2552. The abridged specifications are
stated in the following paragraphs.
3.1 Symbol description
The abridged specifications of China Steel’s magnetic steel coils are stated
as the following:
csc
xx
cs
xxxx
x
Symbol of special application
Iron Loss value of specifications X100
China Steel’s symbol
Nomina thickness X100
China Steel’s specifications
Example: 50CS1300 conforms with 50A1300 grade of JIS C2552.
3.2 Insulating Film
The symbol and type of insulating film are as listed in Table 2.
Table 2: Symbol and Type of insulating film are as listed in Table 2.
Symbol
Type of film
Corresponding JIS symbol
C628
C6N8
Semi-inorganic matter
(inorganic + organic)
CS-2
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3.3 Properties of Specification
Please refer to Table 3.
Table 3: Grade, Electrical and Magnetic Characteristics and Space Factor
Grade of
CSC
Spec.
Grade of Thickness Density
JIS C2552
(mm)
(kg/dm3)
(1)
25CS1500HF --4
0.25
Iron Loss(2),max.
(W/kg)
Magnetic Flux
Density(3),min.
W15/50
(T)
B50
7.65
3.0
1.60
35CS210
35A210
7.55
2.1
1.60
35CS250
35A250
7.60
2.5
1.60
35CS300
35A300
7.65
3.0
1.60
35CS440
35A440
7.70
4.4
1.64
35CS550
---
7.75
5.5
1.64
50CS230
50A230
7.55
2.3
1.60
50CS290
50A290
7.60
2.9
1.60
50CS350
50A350
7.65
3.5
1.60
50CS400
50A400
7.65
4.0
1.61
50CS470
50A470
7.70
4.7
1.62
50CS600
50A600
7.75
6.0
1.65
50CS700
50A700
7.75
7.0
1.68
50CS800
50A800
7.75
8.0
1.68
50CS1000
50A1000
7.85
10.0
1.70
50CS1300
50A1300
7.85
13.0
1.70
65CS470
65A470
7.65
4.7
1.62
65CS600
----
7.75
6.0
1.65
65CS800
65A800
7.75
8.0
1.66
65CS1300
65A1300
7.85
13.0
1.64
0.35
0.50
0.65
Space
Factor,min.
(%)
96
Note: (1) This assumed density is used in all calculation of the sectionalarea of test pieces.
(2) W15/50 indicates the iron loss when the frequency is 50 Hz and the maximum magnetic
flux density is 1.5T(1T=1Wb/m2)
(3) B50 indicates the magnetic flux density under the magnetic force 5000A/m.
3.4 Tolerances on Dimensions
Please refer to Table 4.
Table 4: Tolerances on Dimensions
unit: mm
Tolerance on thickness
Deviation of thickness in transverse direction
Tolerance on width
± 0.01
0.02
+4
0
5
4. Available Sizes
•Thickness: 0.25, 0.35, 0.50, 0.65 mm
•Width range: 1000~1200 mm
Please consult with us, if other sizes are required.
5. Typical Properties
5.1 Typical Mechanical Properties and Space Factor
Please refer to Table 5 and Table 6 for typical values.
Table 5: Typical Machanical Properties and Space Factor
Grade of
CSC
Spec.
Yield
Strength
(N/mm2)
Tensile
Strength
(N/mm2)
Elongation
(%)
Hardness
Number
of
Bend
L
C
L
C
L
C
HR30T
HV1
L
C
25CS1500HF
362
375
489
509
22
21
67
180
38
25
35CS210
439
457
555
575
18
16
72
218
9
7
35CS250
389
400
515
536
21
21
69
207
13
12
35CS300
341
355
483
505
23
22
67
185
17
16
35CS440
308
310
430
445
30
31
65
155
35
33
35CS550
292
302
403
414
34
35
61
138
39
37
50CS230
433
465
551
581
20
18
75
217
5
4
50CS290
376
394
513
537
25
26
72
199
7
6
50CS350
325
334
460
475
26
29
68
207
12
12
50CS400
318
329
453
473
29
31
69
165
25
24
50CS470
303
313
426
449
32
33
65
155
23
23
50CS600
300
307
403
413
35
38
60
135
24
23
50CS700
298
318
424
443
36
35
60
147
23
22
50CS800
332
342
407
414
35
32
60
129
25
24
50CS1000
313
353
402
410
37
38
60
130
25
25
50CS1300
312
330
388
394
37
38
58
120
24
23
65CS470
336
353
484
501
31
33
70
178
14
12
65CS600
276
278
411
415
37
38
60
142
18
17
65CS800
300
274
433
427
37
38
62
143
18
18
65CS1300
316
324
402
408
37
38
59
123
18
18
Space
Factor
(%)
≥99
Note: 1. This result was tested in accordance with JIS(2000) Method.
2. L: specimens taken longitudinal to the rolling direction. C: specimens taken transverse to the
rolling direction.
3. The data on above table is one example of sampling and for reference only.
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Table 6: Typical Machanical Properties and Space Factor of Semi-Process and
High Magnetic Flux Density Products.
Yield
Strength
(N/mm2)
Tensile
Strength
(N/mm2)
L
C
L
C
L
C
HR30T
HV1
L
C
50CS600AC
314
313
386
392
35
36
60
135
27
26
35CS250H
349
363
466
495
20
23
68
187
19
17
Magnetic
35CS300H
310
329
434
455
23
24
66
168
25
22
Flux
50CS470H
312
319
437
461
36
38
64
156
27
22
50CS600H
282
275
402
414
36
36
59
131
15
12
Grade of CSC
Spec.
Type
Semi
Process
High
6
Density
Elongation
(%)
Hardness
Number
of Bend
Space
Factor
(%)
≧99
Note: 1. This result was tested in accordance with JIS(2000) Method.
2. L: specimens taken longitudinal to the rolling direction. C: specimens taken transverse to the
rolling direction.
3. The data on above table is one example of sampling and for reference only.
5.2 Typical Electrcal an Magnetic Properties
As a result of modifying metallurgical in manufacturing, the electrical and
magnetic properties have been greatly enhanced. Please refer to Table 7 and
Table 8 for typical values.
Table 7: Typical electrical and magnetic properties
Grade of
CSC Spec.
Resistivity
(μΩ-㎝)
W10/50
Iron Loss (W/kg)
W15/50 W10/60
W15/60
W10/400
Magnetic Flux Density(T)
B3
B10 B25 B50 B100
25CS1500HF
35CS210
35CS250
35CS300
35CS440
35CS550
50CS230
50CS290
50CS350
50CS400
50CS470
50CS600
50CS700
50CS800
50CS1000
50CS1300
65CS470
65CS600
65CS800
65CS1300
49
62
54
48
39
30
62
54
49
44
43
34
29
32
26
23
44
29
29
27
0.91
0.81
0.91
0.98
1.24
1.92
0.94
1.08
1.16
1.36
1.50
1.76
2.09
2.46
2.74
2.76
1.70
2.10
2.11
3.18
2.14
2.04
2.34
2.45
2.89
4.08
2.28
2.61
2.73
2.95
3.42
4.06
4.47
4.98
5.72
5.99
3.67
4.69
5.36
5.92
13.18
15.57
17.40
18.1
21.4
28.3
22.26
25.94
27.4
29.4
32.2
36.8
40.3
43.7
51.1
53.1
45.8
53.1
54.9
66.5
1.38
1.36
1.37
1.37
1.41
1.42
1.36
1.35
1.37
1.39
1.41
1.41
1.40
1.20
1.33
1.18
1.40
1.38
1.37
1.12
1.13
1.02
1.15
1.23
1.54
1.36
1.21
1.39
1.49
1.75
1.91
2.23
2.62
3.07
3.45
3.47
2.21
2.70
2.73
4.05
2.64
2.46
2.72
2.85
3.45
5.07
2.88
3.21
3.42
3.96
4.12
4.94
5.73
6.43
7.15
7.36
4.80
6.19
6.27
8.33
Note: 1. Test were conducted in accordance with JIS(2000) method.
2. The above data is one example of sampling for reference only.
1.50
1.48
1.49
1.51
1.55
1.57
1.48
1.49
1.52
1.54
1.56
1.56
1.57
1.55
1.58
1.58
1.55
1.54
1.54
1.55
1.59
1.57
1.59
1.60
1.64
1.66
1.57
1.59
1.62
1.63
1.65
1.65
1.67
1.66
1.68
1.68
1.65
1.65
1.65
1.67
1.68
1.67
1.68
1.70
1.72
1.71
1.67
1.69
1.70
1.72
1.73
1.72
1.72
1.72
1.74
1.74
1.73
1.71
1.72
1.74
1.80
1.79
1.80
1.81
1.94
1.85
1.79
1.81
1.82
1.82
1.84
1.84
1.86
1.85
1.87
1.87
1.83
1.84
1.84
1.86
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Table 8: Typical electrial and magnetic properties of Semi-Process and
High Magnetic Flux Density Products
Type
SemiProcess
High
Magnetic
Flux
Density
Iron Loss (W/kg)
Magnetic Flux Density(T)
Grade of CSC
Spec.
Resistivity
(μΩ-cm)
W10/50
W15/50
W10/60
W15/60
W10/400
50CS600AC(1)
20.7
1.81
4.28
4.34
5.65
49.10
1.45 1.59 1.67 1.74 1.86
35CS250H
49.3
0.94
2.26
1.19
2.73
18.27
1.39 1.52 1.61 1.70 1.82
35CS300H
44.4
1.01
2.45
1.28
2.92
19.25
1.41 1.53 1.63 1.72 1.84
50CS470H
43.2
1.45
3.30
1.84
4.05
30.90
1.41 1.56 1.66 1.74 1.85
50CS600H
28.7
1.79
3.78
2.28
5.08
38.50 1.399 1.57 1.67 1.76 1.86
B3
B10
B25
B50 B100
Note: 1. Sample were annealed at 750˚C X2 hrs and tests were conducted in accordance with JIS C
2550(2000).
2. The data on above table is one example of sampling and for reference only.
5.3 Deviation of Thickness in Transverse Direction
Please refer to Table 9 for typical values.
Table 9: Typical Values of the Thickness Deviation in Transverse Direction
Thickness deviation from the width center to the following position
5mm distant
from edge
15mm distant
from edge
25mm distant
from edge
50mm distant
from edge
Mean Value
0.010mm
0.006 mm
0.004 mm
0.003 mm
Maximum Value
0.020mm
0.012mm
0.008mm
0.006mm
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5.4 Types and Feature of insulating Film
The insulating film used on magnetic steel coils is a type of water-based
mixture of inorganic and organic matter. There are two kinds of coating film
that are design for different applications. Please refer to Table 10 for the properties.
Table 10: Characteristics of insulating film
Film code
8
Item
Composition
Average
thickness Of
film
Color
Interlaminar
resistance
Bending Test
Solvent Test
Punchability
Heat
Resistance
Resistance to
Corrsion
Application
grades
C628
(heavy)
C6N8
(heavy)
inorganic + organic
(Inorganic base substance including organic substance)
0.6μm
(1.2μm)
0.6μm
(1.0μm)
Sliver White
Sliver White
(Yellow Green)
(Yellow Brown)
>10Ω-.cm2/sheet
>10Ω-.cm2/sheet
2
(>25.Ω-cm /sheet)
(>25.Ω-cm2/sheet)
No film peeled after bending(Bend radius 10mm),
the adhension is very good.
No film peeled after rubbing 50 times witk alcohol.
Film is firmly bonded on to motor sheet that it
will never peel off due to cutting and punching.
Film remains shinning and adheres well
after 1 hr at 750˚C protected by N2 gas
Area of rust<50% after 5 hrs spraying by 5%, 35˚C NaCl solution.
Without Cr-free requirement
With Cr-free requirement
Note: 1. Wearing resistance is tested by wool grinding that wheel diameter 1120mm, pressure 3.5kg/
cm2, speed 60rpm
9
6. Precaution Notes While in Use
6.1 Avoiding rust and aging:
(1)Due to slitting and punching that cause broken coating film, the ruptured
surface will easily rusted, particularly in summer season when the relative
humidity is high. So, it needs careful package and anti-rust treatment.
(2)For having better magnetic property, magnetic steel generally was produced without temper rolling process. To avoiding coil break in slitting
process, it is necessary to keep coils away from long storage time.
6.2 Stress-relief annealing
Magnetic properties of magnetic steel coils will be deteriorated by mechancal strains when it was sheared and punched into lamminations or cores. In order to relieve these stresss and restore the original magnetic properties, general
stress-relief annealing is necessary. The following points are observed when
laminations or cores are processed to stres-relief annealing.
(1)There are two kinds of coating film to be used in CSC’magnetic steel coils
and they are adapted to various annealing temperature. Please refer the
informations of table10when strees-relief is necessary to be done.
(2)The magnetic property almost was not affected by ordinary industrial
cooling rate scale, but abrupt heating and cooling will make distortion in
cores. However, cooling should be taken until it reaches 350˚C so that no
stain will occur in material.
(3)Since carburization and excessive oxidation will effect the deterioration
of magnetic properties of steel, the atmospheric gas must be carefully
controlled and the dew point must be kept low. On the other hand, the
oiland grease remained during fabrication also must be removed completely, and the low carbon materials are recommended to be used in the
base and cover of annealing furnace.
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7. Packing and Label in coils
7.1 Package in Coils
10
7.2 Label of Coils
11
8. Major International Standards
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9. Units and Conversion Tables
12
kg
kg
kg