GB/T 4240-2019 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 4240-2019 | English | 155 |
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Stainless Steel Wires
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| GB/T 4240-2009 | English | 85 |
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Stainless steel wires
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| GB/T 4240-1993 | English | 70 |
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GB/T 4240-2019: Stainless Steel Wires---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT4240-2019
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.
Chief drafting staffs of this Standard. Xie Yaping, Wen Zhengmao, Ren Cuiying, Gu
Yezhong, Xu Qinhua, Zhang Guofu, Zhai Suping, Lin Ping, Wang Xiaozhu, Xu
Haicheng, Zhen Juan, Xu Liang, Dong Dong, Tu Yuguo, Du Zhonggang, Zhu Xiaojie,
Cheng Yan, Zong Yong, Wang Qing, Wang Baoyu, Wang Lingjun, and Len Mingjian.
The historical edition replaced by this Standard is as follows.
--- GB/T 4240-1984, GB/T 4042-1993, GB/T 4240-2009.
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
Thiocyanate Spectrophotometric Method
GB/T 223.28 Methods for Chemical Analysis of Iron, Steel and Alloy – The α-
Benzoinoxime Gravimetric Method for the Determination of Molybdenum Content
GB/T 223.36 Methods for Chemical Analysis of Iron, Steel and Alloy – The Neutral
Titration Method for the Determination of Nitrogen Content after Distillation
Separation
GB/T 223.37 Methods for Chemical Analysis of Iron, Steel and Alloy - the
Indophenol Blue Photometric Method for the Determination of Nitrogen Content
after Distillation Separation
GB/T 223.40 Methods for Chemical Analysis of Iron, Steel and Alloy - The Anion-
Exchange Separation - Sulphochlorophenol S Photometric Method for the
Determination of Niobium Content
GB/T 223.59 Iron, Steel and Alloy - Determination of Phosphorus Content -
Bismuth Phosphomolybdate Blue Spectrophotometric Method and Antimony
Phosphomolybdate Blue Spectrophotometric Method
GB/T 223.60 Methods for Chemical Analysis of Iron, Steel and Alloy - The
Perchloric Acid Dehydration Gravimetric Method for the Determination of Silicon
Content
GB/T 223.61 Methods for Chemical Analysis of Iron, Steel and Alloy - The
Ammonium Phosphomolybdate Volumetric Method for the Determination of
Phosphorus Content
GB/T 223.64 Iron, Steel and Alloy - Determination of Manganese Content - Flame
Atomic Absorption Spectrometric Method
GB/T 223.72 Iron, Steel and Alloy - Determination of Sulfur Content - Gravimetric
Method
GB/T 223.86 Iron, Steel and Alloy - Determination of Total Carbon Content -
Infrared Absorption Method after Combustion in an Induction Furnace
GB/T 228.1 Metallic Materials - Tensile Testing - Part 1.Method of Test at Room
Temperature
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.
3.2 Surface status
3.2.1 Gray
After the dry drawing and heat treatment, the surface of the steel wire is dull.
3.2.2 Bright
After wet drawing and heat treatment, the surface of the steel wire is bright.
3.2.3 Cleanliness
After the drawing and heat treatment, the surface of the steel wire is clean.
3.2.4 Coating
The surface of the steel wire is coated or plated.
4 Ordering Contents
The contract and ordering list for ordering shall include the following contents.
a) This Standard number;
b) The name of the product;
c) Designation;
5 Classification, Designation and Code
The steel wires are divided into 4 categories according to the structure; its category,
designation, delivery status and code can refer to Table 1.
6 Dimension and Shape
6.1 The nominal size range of the soft steel wire is 0.05mm~16.0mm; the nominal size
range of the lightly drawn steel wire is 0.30mm~16.0mm; while the nominal size range
of the cold drawn steel wire is 0.10mm~12.0mm.
6.2 The allowable deviation of the steel wire size shall conform to the provisions of
Level-11 in Table 2 of GB/T 342-2017.
6.3 The out-of-roundness of the round steel wire shall be no greater than half of the
diameter tolerance.
6.4 The steel wires shall be delivered in coils, spools, tightly wound layers with or
without mandrels, and container package. The coil and densely packed layer winding
shall be regular; when unpacked the coils, the steel wires shall not be scattered,
twisted, tangled or knotted, etc.
6.5 The inner diameter of the steel wire shall conform to the provisions of Table 2.
When the purchaser has special requirements for the diameter of the coil, it shall be
determined through the negotiation between the purchaser and the supplier.
6.6 The length and allowable deviation of the straight steel wires shall conform to the
provisions of Level-II in Table 6 of GB/T 342-2017.
7 Technical Requirements
7.1 Raw materials and chemical composition
7.1.1 The steel designation and chemical composition (smelting analysis) of steel wires
shall conform to the provisions of Table 3.According to the negotiation between the
supplier and the purchaser, and indicated in the contract, the chemical composition
may be adjusted properly;
7.1.2 The allowable deviation of the chemical composition of the steel wire shall
conform to the provisions of GB/T 222.
7.1.3 Other technical requirements for the wire rod of steel wire shall conform to the
provisions of GB/T 4356.
7.2 Delivery status
7.2.1 The steel wire shall be delivered in the condition specified in Table 1.
7.2.2 According to the requirements of the purchaser, the straight or polished steel wire
can be provided.
7.3 Mechanical properties
7.3.1 The mechanical properties of the soft steel wire shall conform to the provisions
of Table 4.
7.3.2 The mechanical properties of the lightly drawn steel wire shall conform to the
provisions of Table 5.
7.3.3 The mechanical properties of the cold drawn steel wire shall conform to the
provisions of Table 6.
7.3.4 The mechanical properties of the straight or polished steel wires are allowed to
have a deviation of ±10%.
7.4 Surface quality
The surface of the steel wire shall be free of scars, folds, cracks, burns, pits, scratches,
scales that are harmful to use; but pits and scratches with an individual depth not
exceeding half of the dimensional tolerance are allowed to exist. The surface of the
straight steel wire allows spiral threads and lubricant residues. The oxide film is allowed
on the surface of the martensitic steel wire delivered in the soft state.
7.5 Special requirements
7.5.1 According to the requirements of the purchaser, through the negotiation between
the supplier and the purchaser, the steel wires with other mechanical properties can
be provided.
7.5.2 According to the requirements of the purchaser, the austenitic stainless-steel wire
with a nominal size greater than 1.0mm can perform the intergranular corrosion test.
The test method shall be negotiated between the supplier and the purchaser, and
indicated in the contract.
8 Test Methods
The inspection items and test methods of steel wire shall conform to the provisions of
Table 7.
9 Inspection Rules
9.1 Inspection and acceptance
9.1.1 The exit-factory inspection and acceptance of the steel wire shall be carried out
by the supplier’s quality department.
9.1.2 The inspection and acceptance of the steel wire shall be performed as per the
Designation Nominal diameter / mm Tensile strength Rm/ MPa
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.
10 Packaging, Marking and Quality Certificate
The steel wires are generally packed according to the Type-C or Type-E in GB/T 2013-
2008; If other package types are required, it shall be indicated in the contract. The
marking and quality certificate shall meet the requirements of GB/T 2103-2008.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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