Ministry of Regional Development of Russian Federation
Federal Agency for State Property Management
Public Corporation
«Research Society «Construction»»
Group B22
Approved by
First deputy of Director general
of the Public Corporation
«Research Society «Stroitelstvo»»
K.V.Tarasenko
27/01/2014
Hot rolled rail steel rebar for ferroconcrete reinforcement
TECHNICAL SPECIFICATION
(first introduced)
TR – 0933-313-36554501-2014
Implementation date since 27/01/2014
Approved by
The director general
Of the Public Corporation “Metal-rolling plant”
Y.L. Yershov
Developed by
The director of the Research Institute of concrete and ferroconcrete of A.A. Gvozdev
the Public Corporation «Research Society «Stroitelstvo»»
A.N.Davidyuk
The chief of the rebar laboratory
S.A.Madatyan
Moscow
2014
The content
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
Field of application……………………………………………………………………………….…….………………………..3
Normative references…………………………………………………………………………..……….……………………...3
Terms and definitions………………………………………………………………………….……….……………………...4
Classification and assortment…………………………………………………………….……….……………….………..5
Technical requirements………………………………………………………………….…………….…………………...…7
Rules of Acceptance…………………………………………………………………………….……..………………………..9
Testing methods……………………………………………………………………………………….…….…………………..10
Marking, packing, handling and storage………………………………………………….…………………………..10
Application notes……………………………………………………………………………………………….………………..11
Producer’s guarantees…………………………………………………………………………………….……………………12
Appendix A
1. Field of application
Given technical specification (hereinafter - TS) apply to unwelded deformed
bars grade A500, steel grade 76 made of rail steel and aimed to reinforce
ferroconcrete constructions of different purposes.
It is recommended to use given TS while designing reinforcement of
ferroconcrete constructions of different purposes as well as while carrying
out certification in the voluntary certification systems.
2. Normative references
These normative documents are used in the given technical specification:
State Standard - GOST 7566-94 Metal Production. Acceptance, marking,
packing, handling and storage.
State Standard - GOST 12004-81 Reinforcing-bar steel. Stretching testing
methods.
State Standard - GOST 21014-88 Ferrous metals rolling. Terms and
definitions of the surface defects.
State Standard - GOST 22536.0-87 Carbon steel and unalloyed cast iron.
Common requirements to the analysis methods
State Standard – GOST 22536.1-88 Carbon steel and unalloyed cast iron.
Methods of the total carbon and graphite detection.
State Standard - GOST 22536.2-87 Carbon steel and unalloyed cast iron.
Methods of sulfur detection.
State Standard - GOST 22536.3-88 Carbon steel and unalloyed cast iron.
Methods of phosphor detection.
State Standard - GOST 22536.4-88 Carbon steel and unalloyed cast iron.
Methods of silicium detection.
State Standard - GOST 22536.5-87 Carbon steel and unalloyed cast iron.
Methods of manganese detection.
State Standard - GOST 22536.11-87 Carbon steel and unalloyed cast iron.
Methods of titanium detection.
State Standard - GOST 22536.12-88 Carbon steel and unalloyed cast iron.
Methods of vanadium detection.
State Standard - GOST P 52544-2006. Periodical profile A500C and B500C
welded rebar for the reinforcing of ferroconcrete constructions.
Building code - SNIP 2.03.01-84 Concrete and ferroconcrete constructions.
Formulary 63.13330.2012 “Building code - SNIP 52-01-2003 Concrete and
ferroconcrete constructions. Fundamentals.”
3. Terms and definitions.
Terms with following definitions are used in the given TS.
Deformed bars: rods with the chucks evenly spread at an angle to their long
axis all over their surface to improve cohesion with concrete.
Nominal diameter rebar dn, mm: rebar which actual diameter d with due
regard to permissible deviations is equal to the diameter from the
assortment in the table 1.
Actual diameter of the rebar d, mm: diameter of the round smooth rod with
length equal to 1 m, equal-sized area and the same mass that rebar of
periodical profile has. It can be defined by the following formula.
D=12,74√
𝑚
𝑙
Where m is the mass of the deformed bar;
l is the length of the deformed bar, mm.
Nominal area of the cross-section Fn, mm²: area of the rebar cross section
which has equal area with the cross section of the round smooth rod with
the same nominal diameter.
Elements of the rebar’s periodical profile (appendix A)
Longitudinal rib: continuous longitudinal protuberance formed along the axis
of a bar during the rolling process.
Cross rib: the rib located at the angle to the longitudinal axis of the rebar.
Geometrical parameters of the deformed bars:
The ribs height h, mm: the distance from the upper point of the cross rib to
the surface of the rebar’s corpus, measured perpendicular to the rolled
metal’s axis.
Fin spacing t, mm: the distance between two adjacent cross ribs measured
along the rebar’s axis.
The total distance between the end of the cross ribs Σei, mm: the sum of the
distances between the ends of the cross ribs measured in the plane
perpendicular to the rebar’s axis (for the profile on the pic. A.1 Σei=e1+e2)
Cross rib’s β angle of inclination: the angle between the cross rib’s axis and
rebar’s longitudinal axis.
Angle of inclination of the cross rib’s α side surface, degree: angle of
inclination of the cross rib’s side surface to the rebar’s longitudinal axis.
Cross ribs’ width, b mm: the dimension of the upper part of the rib’s
trapezoidal cross section in its section, which is perpendicular to the rib’s axis.
Ovality, mm: the difference between the largest and the smallest dimensions
of the rebar’s cross section. For the deformed bars on the pic. A.1 –
difference between the actual dimensions d1 and d2.
Percentage area of the deformed bars’ cross ribs’ crumbling fr: the area of
the cross ribs projection on the plane, which is perpendicular to the rebar’s
axis, with regard to the multiplication of the nominal diameter
circumference’s length and the actual mean spacing of these ribs.
4. Classification and assortment.
4.1Grade A500 rebar made of rail steel is produced during the hot rolling
without following processing.
A Grade name consists of:
A – which is for hot rolled rebar;
500 – which means that the yield strength is less than 500 N/mm².
4.2Nominal diameter, cross section’s area and mass of the rebar with the
length equal to 1 m must correspond with the meanings represented in
the table 1.
Table 1 – nominal diameter, cross section’s area and mass of the rebar
with the length equal to 1 m.
Nominal diameter dn, mm
Nominal area of the cross Nominal mass of the rebar
section Fn
with the length equal to 1 m,
kg
78,5
0,616
113,1
0,888
153,9
1,208
201,1
1,578
254,5
1,998
10,0
12,0
14,0
16,0
18,0
Notes
1. At the customer request rebar can be made with nominal diameter: 9; 9,5 mm.
2. Nominal mass of the rebar with the length equal to 1 m is defined according to the
nominal diameter with the metal density which is equal to 7,85 g/cm
4.3Deformed bars must consist of not less than two rows of cross ribs which
have falcate shape and aren’t linked with longitudinal ribs. Delivery of the
rebar without longitudinal ribs is permitted.
Table 2 – Parameters of deformed bars.
Name of the deformed bars parameter
Nominal length, mm
Permissible deviation from the cross
section’s nominal area and the 1 meter
length bar’s mass, for the rolled metal
diameter, mm:
From 9 to 14 inclusive
»10,5»18»
Percentage area of the periodical profile fr
cross ribs’ crumbling, not less than, of the
diameter, mm
From 9,5 to 10 inclusive
»10,5»18»
Cross ribs’ height h, mm
Cross ribs’ spacing t, mm
Cross ribs’ angle of inclination δ
Angle of inclination of the rib’s lateral face
α, not more than
Total distance from the ends of the cross
ribs, mm, not less than
Parameter’s value
9-18
+-5
+-4
0,052
0,056
(0,065-0,1) dn
(0,4-1,0)dn
35°-60°
45°
0,2πdn
Configuration of deformed bars is represented in this Technical
Specification’s appendix A and should satisfy State Standard - GOST P
52544 and general requirements to the bars in the table 2.
In coordination with the customer it is allowed to deliver deformed bars’
configuration which is different from the requirements of the appendix A
on the assumption of the rebar properties’ correspondence with the
requirements of the given standard.
4.4Reinforcing rolled metal is produced in the shape of bars.
4.5The bars are made with:
- Specific cut length;
- Specific cut length with off-gage segments which length is not less than 2
m and not more than 15% of the consignment’s mass;
- Off-gage length.
The presence of the bars with the length equal to 3-10 cm is admitted in the
consignment but not more than 7% of its mass.
In coordination with the customer it is admitted to produce rods with the
length from 2 to 11,7.
Extreme deviation of the rods with specific cut length is plus 100 mm.
4.6Rods’ curvature mustn’t exceed 0,6% of the measurable length.
The example of the schematic symbol:
Rebar made in rods with nominal diameter equal to 12 mm, grade A500,
specific cut length 11700 mm.
Rod 12 11700 – A500 TR 0933-313-36554501-2014
5. Technical Requirements
5.1Rebar’s qualities must satisfy the norms represented in the table 3.
Table 3 – the properties of the reinforcing rolled metal
The name of index
Index value
Diameter, mm
9-18
Dimensions of the rolled metal’s periodical 4.3 of the given Technical Specification
profile
Assumed deviation of the nominal meaning 4.3 of the given Technical Specification
of the cross section area and mass of the
rebar with the length of 1 m
Minimal percentage area of the periodical 4.3 of the given Technical Specification
profile cross ribs’ crumbling fr
Wield strength αt(α0.2), N/mm2, not less 500
than
Tensile strength αv, N/mm2, not less than
880
Percentage elongation δ5, %, not less than 6
General extension δr, %, not less than
2
Statistical
provision
of
mechanical 5.8 of the given Technical Specification
properties
Bend properties
5.5 of the given Technical Specification
Chemistry
5.6 of the given Technical Specification
Physical (αt) and conventional (α0,2) wield strengths based on State Standard - GOST 12004
are meant by Wield Strength.
5.2Rebar is delivered in hot-rolled condition without further processing.
5.3Following things are not allowed on the surface of the rebar:
- Cracks;
- Overlaps, blisters leading to the quality deterioration;
Small damages of ribs and collars are allowed in quantity not more than 3
per 1 m of the product’s length. Slight rust, separate expanded
contaminations, fingerprints, wash-outs, prints of expanded bubbles, ripple
makings, scaliness are allowed within the limits of permissible deviation.
Surface blemishes’ classification is based on the State Standard - GOST
21014.
5.4Statistic indexes of tensile strength αt and wield strength αw(α0,2)
mentioned in the table 3 should be not less than 0,95 in every consignment.
5.5Rebar must endure the bend up to the angle of 45° in cold condition around
the saddle 5 dn in diameter. Norma in cold bending is established as not
less than 30° for the rebar with the diameter equal to 18mm.
5.6Finished rebar’s chemistry must corresponds the requirements mentioned
in the table
Table 4 – Finished rebar’s chemistry.
Stee
l
mar
k
76
Carbo
n
Manganes
e
Silico
n
Vanadiu
m
Titaniu
m
Zirconiu
m
Sulfu Phosphor
r
us
Not more than
0,710,75-1,25 0,18- 0,04 0,035
0,84
0,55
5
Note: occurrence of vanadium up to 0.025 % and titanium up to 0,02% is allowed
5.7Finished rebar’s chemistry deviation under the condition of compliance
with technical requirements’ norma is mentioned in the table 5.
Table 5 – Extreme deviation in the chemistry of finished rebar.
Elements
Carbon
Silicon
Manganese
Sulfur
Phosphorus
Titanium
Vanadium
Extreme deviation
±0,03
±0,05
±0,20
±0,005
±0,005
±0,005
±0,005
5.8Statistic indicators of tensile strength αv and wield strength αt(α0,2) of
rebar must correspond with the requirements in the table 6. Methodic of
rebar statistic indicators’ definition is in the State Standard - GOST P
52544.
Table 6 – Statistic indicators of the rebar’s mechanical properties.
Mechanical properties’ statistic indicators, not more than
Mean square deviation, N/mm2
Constant of variation
S
S ˳̥
S/ X͞
S ˳̥/ X͂
αt(α0,2)
αw
αt(α0,2)
αw
αt(α0,2)
αw
αt(α0,2)
70
70
40
40
0,08
0,07
0,05
Note:
1. Following symbols are used in the given table:
αw
0,04
S – Parameter’s mean square deviation in tests’ parent population;
S˳̥ - Parameter’s mean square deviation in consignment;
X͞ – Parameter’s average value in tests’ parent population;
X͂ – Parameter’s minimal average value in consignment.
6. Rules of acceptance
6.1General rules of acceptance according to the State Standard - GOST 7566.
6.2Acceptance control at producer’s.
6.2.1 Rebar at producer’s is received in consignments with the control of the
following characteristics.
- Wield strength
- Tensile strength
- Percentage and even elongation
- Bending properties
- Cross section area and 1 meter length’s mass
- Periodical profile’s dimensions and percentage area of periodical profile
cross ribs’ crumbling.
- Chemistry
- Surface quality
- Rods’ curvature
6.2.2 Consignment must consist of rebar of one nominal diameter and also
must be drawn in one quality certificate.
Consignment mass must be not less than 70 t.
6.2.3 The following things are chosen from every consignment:
- 1 sample for the chemistry control;
- 2 samples for the control of surface quality, geometrical dimensions, profile
and mass;
- 2 samples for extension test;
- 2 samples for curvature tests.
6.2.4 Every test result must satisfy requirements of the section 5.
6.2.5 In case of receiving unsatisfied results of at least one index iterated tests
must be hold on the basis of doubled quantity of samples. Reiterated tests’
results are final.
6.3 Every rebar consignment must be accompanied with quality certificate
drawn in compliance with the State Standard - GOST 7566 requirements.
Rebar quality certificate must include:
- Nominal diameter;
-
Rebar’s grade and given technical requirements’ indexes;
Chemical elements’ mass fraction in steel given in the table 4;
Tensile strength αt;
Wield strength αw (α0,2);
Percentage elongation δ5 and even elongation δr;
Bending test results in cold state.
Such statistic indexes of strength properties as minimal average values of
wield strength αw(α0,2) and tensile strength αt in every consignment and
their mean square value S˳ are indicated in the certificate at customer’s request.
6.4Incoming inspection at customer’s
6.4.1 Every rebar consignment is exposed to incoming inspection at
customer’s.
6.4.2 One sample is chosen for the control of the surface quality, geometrical
dimensions and mass of the rebar with the length equal to 1 meter.
6.4.3 Sample tests of bending, stretching and curve of the rebar delivered with
the notion of mechanical properties’ statistic indexes quality are allowed not
to be conducted.
6.4.3.1 In case of the disagreement in products’ quality assessing mechanical
properties control is fulfilled in compliance with the appendix B of the State
Standard - GOST 52544.
7. Testing methods
7.1 Rebar’s surface quality is tested without using magnifying devices.
7.2 Stretching tests used rebar samples in delivery condition.
Stretching tests with definitions of αw (α0,2), αv, δ5, δr are carried out in
compliance with the State Standard - GOST 52544.
7.3 Definition of rebar’s statistical indexes of mechanical properties’
variability in entire essembly and in every consignment are held in compliance
with State Standard - GOST P 52544.
7.4 Bending test in cold condition is carried out in compliance with the State
Standard - GOST 14019.
7.5 Geometrical parameters of rebar are tested in compliance with the State
Standard - GOST P 52544.
7.6 Steel chemical analysis is carried out according to the State Standards GOST 22536.0 – GOST 22536.4, GOST 22536.5, GOST 22536.11, GOST
22536.12 or to the other methods providing necessary accuracy.
8. Marking, packing, handling and storage
8.1 Marking, packing, handling and storage of rebar is held according to the
State Standard - GOST 7566 with following supplements.
8.2 Marking
8.2.1 Rebar must have rolling marking including trademark of the
manufacturer and the label of rolling grade A 500.
8.3.2 Other types of rolling labels which don’t decrease operating ability of
the rebar and submitted to customer’s approval are allowed.
8.3.3 Every bunch of rebar must have a label including the following
information:
- trademark and manufacturer’s name;
- nominal diameter of the rebar, mm;
- rebar’s grade;
- given standard’s indexes;
- consignment’s number.
9. Application notes
9.1 Given notes are applied to designing and using of general and pre-stressed
ferroconcrete constructions of different purposes of the rod-shaped and hotrolled rebar of periodical profile grade A500 of the grade 76 steel produced
of the rail steel (later – deformed bars A 500) 10-18 mm in diameter.
9.2 Calculation and designing of the elements of general ferroconcrete
constructions with deformed bars A 500 should be carried out according to
the Building Code - SNIP 63.13330.2012 (actualized edition of the Building
code 52-01-2003) taking into consideration the given technical requirements
with the following supplements:
- it is prohibited to weld deformed bars A500 using any methods of welding;
- it is allowed to connect deformed bars A 500 with molded and threading
couplings according to the following normative documents:
- temperature field of the application should be accepted as the one of the
grade 80C° steel in compliance with the Building code 2.03.01-84
(Application 1).
9.3 In prestressed constructions deformed bars A 500 can be used under the
condition of the sufficient economic justification and with the fulfillment of
the following conditions:
- prestressing value αsp+p must be not more than 500 N/mm2;
- Maximum allowed temperature of the electric heating under the electro
thermal method of rebar tension is -450° C.
10.
Producer’s guarantees
10.1 Manufacturer guarantees production’s compliance with the given
technical conditions’ requirements under the condition that Customer will
keep to the handling and storage rules, products’ field of application
established in the given technical requirements.
Application A
(obligatory)
Types and dimensions of the rebar’s periodical profile.
A.1 Configuration, dimensions and extreme deviations from of the reinforcing
rolled metal’s periodical profile providing accomplishment of the following
requirements given in the table 2 of the given technical requirements and
delivered in hot rolled condition are given on the picture A.1 and in the table
A.1.
Picture A.1 – Hot-rolled rebar’s periodical profile.
Table A.1
Rebar’s
nominal
diameter
10
12
14
16
18
d
Nominal Extreme
deviation
9,5
11,3
13,3
15,2
17,1
+0,3
-0,5
h,
not
less
than
0,8
1,0
1,1
1,2
1,3
Periodical profile’s parameters
d1, d2
t
Extreme b
deviation
Nomina Extreme
l
deviation
11,5
13,7
15,9
18,0
20,1
±0,6
±0,8
6 ±15
7
8
9
10
1,0
1,2
1,4
1,6
1,8
E1,e1
not
more
than
3,1
3,8
4,4
5,0
5,6
Not b
less max min
than
45°
60°
Dimensions for which extreme deviations were not established were given for
caliber building and are not tested on the finished rebar.
35°