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GB/T 4240-2019 PDF in English


GB/T 4240-2019 (GB/T4240-2019, GBT 4240-2019, GBT4240-2019)
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GB/T 4240-2019: PDF in English (GBT 4240-2019)

GB/T 4240-2019
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.65
H 49
Replacing GB/T 4240-2009
Stainless Steel Wires
ISSUED ON: JUNE 04, 2019
IMPLEMENTED ON: JANUARY 01, 2020
Issued by: State Administration for Market Regulation;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative References ... 5
3 Terms and Definitions ... 7
4 Ordering Contents ... 8
5 Classification, Designation and Code... 8
6 Dimension and Shape ... 9
7 Technical Requirements ... 10
8 Test Methods ... 19
9 Inspection Rules ... 19
10 Packaging, Marking and Quality Certificate ... 21
Appendix A (Informative) Comparison between Designation in this Standard
and Domestic & Foreign Designations ... 22
Foreword
This Standard was drafted as per the rules specified in GB/T 1.1-2009.
This Standard replaced GB/T 4240-2009 Stainless Steel Wires.
Compared with GB/T 4240-2009, this Standard has the major technical changes as
follows:
--- The structural category has been expanded from three categories in the original
standard to four categories; add “austenite-ferrite type” (see Tables 1 and 3 of
this Edition; Tables 1 and 3 of 2009 Edition);
--- Tighten the allowable deviation of the steel wire size (see 6.2 of this Edition; 6.2
of 2009 Edition);
--- Tighten the allowable deviation of the steel wire length (see 6.6 of this Edition;
6.6 of 2009 Edition);
--- Add the chemical composition and relevant requirements for 6 designations such
as O7Cr19Ni10, 06Cr18Ni11Ti, 022Cr23Ni5Mo3N, 026Cr24, 06Cr13,
14Cr17Ni2; delete the relevant requirements and the designation of 21Cr17Ni2
(see Tables 1, 3, 4, 5, 6 of this Edition; and Tables 1, 3, 4, 5, 6 of 2009 Edition);
--- Supplement the mechanical properties of some designations for the soft state of
steel wire (see Table 4 of this Edition; Table 4 of 2009 Edition);
--- Modify the requirements for the surface condition of the steel wire (see 7.2.3 of
this Edition; 7.2.3 of 2009 Edition);
--- Add technical requirements and methods for intergranular corrosion test of
austenitic stainless-steel wire (see 7.5.2 and Table 7 of this Edition);
--- Add comparison of different designations of this Standard (see Appendix A).
This Standard was proposed by China Iron and Steel Industry Association.
This Standard shall be under the jurisdiction of National Technical Committee for
Standardization of Steel (SAC/TC 183).
Drafting organizations of this Standard: Dongbei Special Steel Group Co., Ltd.;
Zhejiang Tenglong Stainless Steel Products Co., Ltd.; Jiangsu Fasten Hongsheng
Stainless Steel Products Co., Ltd.; Jiangsu Shenyuan Group Co., Ltd.; Jiangsu
Xinghuo Special Steel Co., Ltd.; Zhejiang Tsingshan Iron & Steel Co., Ltd.; Nantong
Songcheng Industrial Co., Ltd.; and China Metallurgical Information and
Standardization Institute.
Stainless Steel Wires
1 Scope
This Standard specifies the terms and definitions, ordering contents, classification and
designation, dimension, shape, technical requirements, test methods, inspection rules,
packaging, marking and quality certificate of stainless-steel wires.
This Standard is applicable to the stainless-steel wire (hereinafter referred to as steel
wire), but excluding the stainless-steel wire for cold top forging and welding; excluding
the austenitic and precipitation hardening spring stainless-steel wire.
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 document.
GB/T 222 Permissible Tolerances for Chemical Composition of Steel Products
GB/T 223.4 Iron, Steel and Alloy - Determination of Manganese Content -
Potentiometric or Visual Titration Method
GB/T 223.9 Iron, Steel and Alloy - Determination of Aluminum Content – Chrome
Azurol S Photometric Method
GB/T 223.11 Iron, Steel and Alloy - Determination of Chromium Content - Visual
Titration or Potentiometric Titration Method
GB/T 223.17 Methods for Chemical Analysis of Iron, Steel and Alloy – The
Diantipyrylmethane Photometric Method for the Determination of Titanium Content
GB/T 223.18 Methods for Chemical Analysis of Iron, Steel and Alloy – The Sodium
Thiosulfate Separation Iodimetric Method for the Determination of Cupper Content
GB/T 223.23 Iron, Steel and Alloy - Determination of Nickel Content - The
Dimethylglyoxime Spectrophotometric Method
GB/T 223.25 Methods for Chemical Analysis of Iron, Steel and Alloy – The
Dimethylglyoxime Gravimetric Method for the Determination of Nickel Content
GB/T 223.26 Iron, Steel and Alloy - Determination of Molybdenum Content - The
GB/T 3207-2008 Bright Steel
GB/T 4334-2008 Corrosion of Metals and Alloys - Test Methods for Intergranular
Corrosion of Stainless Steels
GB/T 4356 Stainless Steel Wire Rods
GB/T 11170 Stainless Steel - Determination of Multi-Element Contents - Spark
Discharge Atomic Emission Spectrometric Method (Routine Method)
GB/T 20066 Steel and Iron - Sampling and Preparation of Samples for the
Determination of Chemical Composition
GB/T 20123 Steel and Iron - Determination of Total Carbon and Sulfur Content
Infrared Absorption Method after Combustion in an Induction Furnace (Routine
Method)
GB/T 20124 Steel and Iron - Determination of Nitrogen Content - Thermal
Conductimetric Method after Fusion in a Current of Inert Gas (Routine Method)
GB/T 20878 Stainless and Heat-Resisting Steels - Designation and Chemical
Composition
3 Terms and Definitions
For the purposes of this document, the following terms and definitions apply.
3.1 Delivery status
3.1.1 Soft
The steel wire is subjected to bright heat-treatment, or pickled or taken similar
treatment after heat treatment to remove the surface oxide scale.
3.1.2 Lightly drawn
After heat treatment, the steel wire is drawn to the finished product dimension with a
small area reduction ratio.
3.1.3 Cold drawn
After heat treatment, the steel wire is performed the conventional drawing; that is, the
forming process by pressure processing methods such as die drawing and roll drawing
at normal temperature.
3.2 Surface status
provisions of GB/T 2103-2008.
9.2 Batching rules
The steel wires shall be inspected and accepted in batches. Each batch consists of the
steel wires with the same designation, the same furnace number, the same size, and
the same delivery status.
9.3 Sampling quantity and sampling position
The sampling quantity and sampling position of the steel wires shall conform to the
provisions of Table 7.
9.4 Reinspection and judgment rules
The reinspection and judgement rules of the steel wires shall conform to the provisions
of GB/T 2103-2008. When the test results of the mechanical property are unqualified,
the two ends of the steel wire coil shall be removed for a certain length and then double
samples shall be taken for reinspection; the results shall conform to the provisions of
this Standard. Even if one of the specimens in the reinspection results is unqualified,
then such batch shall be judged to be unqualified. Inspection can also be taken on a
disc-by-disc basis; only those qualified can be delivered.
Table 7 – Inspection Items, Sampling Quantity, Sampling Position and Test
Methods of Steel Wire
S/N Inspection items
Sampling
quantity a
Sampling
position Test methods
1 Chemical composition
piece/furnace
As per provisions
of GB/T 20066
GB/T 223.4, GB/T 223.9, GB/T 223.11,
GB/T 223.17, GB/T 223.18, GB/T
223.23, GB/T 223.25, GB/T 223.26,
GB/T 223.28, GB/T 223.36, GB/T
223.37, GB/T 223.40, GB/T 223.59,
GB/T 223.60, GB/T 223.61, GB/T
223.64, GB/T 223.72, GB/T 223.86,
GB/T 11170, GB/T 20123, GB/T 20124
2 Tensile test 3 pieces
One end on
different disc
(piece)
GB/T 228.1
If nominal size of the steel wire is ≤
1.5mm, then gauge for elongation after
break is L=50mm. If nominal size of
steel wire is >1.5mm, the gauge for
elongation after break is L=100mm.
3 Intergranular corrosion 2 pieces
One end on
different disc
(piece)
As agreed b
......
 
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.