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GB/T 36915-2019 English PDF (GBT36915-2019)

GB/T 36915-2019 English PDF (GBT36915-2019)

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GB/T 36915-2019: Steel wire and wire products -- General test methods
GB/T 36915-2019
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.65
H 22
Steel wire and wire products - General test methods
(ISO 22034-1:2007, Steel wire and wire products -
Part 1: General test methods, MOD)
ISSUED ON: MARCH 25, 2019
IMPLEMENTED ON: FEBRUARY 01, 2020
Issued by: State Market Regulatory Administration;
Standardization Administration of PRC.
Table of Contents
Foreword ... 4 
1 Scope ... 5 
2 Normative references ... 5 
3 Tensile test ... 6 
4 Torsion test ... 8 
5 Bending test ... 9 
6 Winding test ... 10 
7 Compression test ... 10 
8 Acid-leaching test ... 11 
9 Hardness test ... 11 
10 Hardenability test ... 11 
11 Fatigue test ... 12 
12 Measurement of ring ... 12 
13 Artificial aging ... 14 
14 Stress-relaxation test ... 14 
15 Microstructure test ... 14 
16 Decarburization-layer test ... 14 
17 Grain-size test ... 15 
18 Segregation test ... 15 
19 Non-metallic inclusion test ... 15 
20 Non-destructive testing ... 15 
21 Chemical analysis ... 15 
22 Zinc-layer quality ... 15 
23 Retest ... 16 
Appendix A (Informative) Comparison of clause numbers between this standard
and ISO 22034-1:2007 ... 17 
Appendix B (Informative) Technical differences between this standard and ISO
22034-1:2007 and their causes ... 19 
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard uses the redrafting method to modify and use ISO 22034-1:2007
“Steel wire and wire products - Part 1: General test methods”.
As compared with ISO 22034-1:2007, this standard has structural adjustments.
Appendix A lists the comparison of clause numbers between this standard and
ISO 22034-1:2007.
There are technical differences between this standard and ISO 22034-1:2007.
The terms involved in these differences have been marked by a vertical single
line (|) in the blank position of the outer margin. Appendix B gives the
corresponding technical differences and their causes.
This standard also made the following editorial changes:
- CHANGE the standard name to “Steel wire and wire products - General
test methods”.
This standard was proposed by the China Iron and Steel Association.
This standard shall be under the jurisdiction of the National Steel
Standardization Technical Committee (SAC/TC 183).
Drafting organizations of this standard: National Wire Rope Product Quality
Supervision and Inspection Center, Guangdong Jianlang Hardware Products
Co., Ltd., Jiangsu Shenyuan Group Co., Ltd., Shandong Daye Co., Ltd.,
Nantong Songcheng Industrial Co., Ltd., Metallurgical Industry Information
Standards Institute.
The main drafters of this standard: Chen Jianhao, Wu Peng, Ren Cuiying, Wang
Lingjun, Han Kun, Zhang Guofu, Chen Ziwang, Li Wenjun, Lu Yafei, Tu Yuguo,
Mao Liuquan, Leng Mingjian.
Steel wire and wire products - General test methods
1 Scope
This standard specifies the tensile test, torsion test, bending test, winding test,
compression test, acid-leaching test, hardness test, hardenability test, fatigue
test, ring-shape measurement, artificial aging, stress-relaxation test,
microstructure test, decarburization layer test, grain size test, segregation test,
non-metallic inclusion test, non-destructive testing, chemical analysis, zinc-
layer quality, retest, other general test methods of steel wire and wire products.
This standard applies to cold-worked steel wire with constant cross-section
(circular or profiled), annealed steel wire, quenched and tempered steel wire,
coated steel wire, etc.
2 Normative references
The following documents are essential to the application of this document. For
the dated documents, only the versions with the dates indicated are applicable
to this document; for the undated documents, only the latest version (including
all the amendments) are applicable to this standard.
GB/T 224 Determination of depth of decarburization of steels (GB/T 224-
2008, ISO 3887:2003, MOD)
GB/T 228.1 Metallic materials - Tensile testing - Part 1: Method of test at
room temperature (GB/T 228.1-2010, ISO 6892-1:2009, MOD)
GB/T 230.1 Metallic materials - Rockwell hardness test - Part 1: Test method
(GB/T 230.1-2018, ISO 6508-1:2016, MOD)
GB/T 231.1 Metallic materials-Brinell hardness test - Part 1: Test method
(GB/T 231.1-2018, ISO 6506-1:2014, MOD)
GB/T 232 Metallic materials - Bend test (GB/T 232-2010, ISO 7438:2005,
MOD)
GB/T 238 Metallic materials - Wire - Reverse bend test (GB/T 238-2013, ISO
7801: 1984, MOD)
GB/T 239.1 Metallic materials - Wire - Part 1: Simple torsion test (GB/T
239.1-2012, ISO 7800:2003, MOD)
GB/T 239.2 Metallic materials - Wire - Part 2: Reverse torsion test (GB/T
239.2-2012, ISO 9649:1990, MOD)
GB/T 1839 Test method for gravimetric determination of the mass per unit
area of galvanized coatings on steel products (GB/T 1839-2008, ISO
1460:1992, MOD)
GB/T 2103 General requirements for acceptance, packing, marking and
quality certification of steel wire
GB/T 2972 Test method for uniformity of zinc coating on zinc-coated steel
wire by the copper sulphate dip (GB/T 2972-2016, ISO 7989-2:2007, NEQ)
GB/T 2975 Steel and steel products - Location and preparation of samples
and test pieces for mechanical testing (GB/T 2975-2018, ISO 377:2017,
MOD)
GB/T 2976 Metallic materials - Wire - Wrapping test (GB/T 2976-2004, ISO
7802:1983, IDT)
GB/T 4337 Metallic materials - Fatigue testing - Rotating bar bending method
(GB/T 4337-2015, ISO 1143:2010, MOD)
GB/T 4340.1 Metallic materials - Vickers hardness test - Part 1: Test method
(GB/T 4340.1-2009, ISO 6507-1: 2005, MOD)
GB/T 6394 Metal - Methods for estimating the average grain size
GB/T 10561 Steel - Determination of Content of Nonmetallic Inclusions -
Micrographic Method Using Standards Diagrams (GB/T 10561-2005, ISO
4967:1998, IDT)
GB/T 13298 Inspection methods of microstructure for metals
GB/T 21839 Steel for prestressed concrete - Test methods (GB/T 21839-
2008, ISO 15630-3:2002, MOD)
YB/T 4413 Metallographic evaluation method for center segregation of high-
carbon steel wire rod
3 Tensile test
3.1 General requirements
The tensile test shall be carried out in accordance with GB/T 228.1. Determine
the mechanical properties such as tensile strength, yield strength, elongation,
percentage reduction of area, modulus of elasticity of the steel wire.
3.2 Preparation of specimens
The sample can be made according to GB/T 2975. Generally, the full section is
used, that is, the part where the steel wire is not machined. When the specimen
is straightened, damage should be avoided.
3.3 Cross-sectional area of specimen
In the calculation, the cross-sectional area uses the nominal size. When
specified in the relevant product standard, it shall be implemented in
accordance with the relevant standards.
For profiled steel wire, the cross-sectional area of the specimen may be
calculated with reference to formula (1):
Where:
A - Cross-sectional area of specimen, in square millimeters (mm2);
m - Mass of specimen, in grams(g);
ρ - Density of specimen, in grams per cubic centimeter (g/cm3);
L - Length of specimen, in millimeters (mm).
3.4 Clamping method
In order to avoid the steel wire from breaking in the clamping zone, when the
diameter of the specimen is small (generally not more than 1 mm), it is
recommended to wrap the both ends of the steel wire aro...
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