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This standard is developed in accordance with the rules given in GB/T 1.1-2009.
This standard replaces GB/T 4240-2009 Stainless steel wires.
The following main technical changes have been made with respect to GB/T 4240-2009:
——the texture-based types are expanded from the original three types to four types, and "austenitic-ferritic" type is added (see Tables 1 and 3; Tables 1 and 3 of Edition 2009);
——the permissible deviation of steel wire dimension is strengthened (see 6.2; 6.2 of Edition 2009);
——the permissible deviation of straight steel wire length is strengthened (see 6.6; 6.6 of Edition 2009);
——the chemical composition and relevant requirements of six designations, i.e., O7Cr19Ni10, 06Cr18Ni11Ti, 022Cr23Ni5Mo3N, 026Cr24, 06Cr13 and 14Cr17Ni2 are added, and the designation 21Cr17Ni2 and relevant requirements are deleted (see Tables 1, 3, 4, 5 and 6; Tables 1, 3, 4, 5 and 6 of Edition 2009);
——the mechanical properties of some designations of soft steel wires are supplemented (see Table 4; Table 4 of Edition 2009);
——the surface condition requirements are modified (see 7.2.3; 7.2.3 of Edition 2009);
——the technical requirements and methods for intergranular corrosion test of austenitic stainless steel wire are added (see 7.5.2 and Table 7);
——the designation cross-references of different editions of this standard are added (see Annex A).
This standard was proposed by China Iron and Steel Association.
This standard is under jurisdiction of the National Technical Committee on Iron and Steel of Standardization Administration of China (SAC/TC 183).
The previous editions of this standard are as follows:
——GB/T 4240-1984, GB/T 4240-1993 and GB/T 4240-2009.
Stainless steel wires
1 Scope
This standard specifies the terms and definitions, order information, classification and designation, dimension, shape, technical requirements, test methods, inspection rules, packaging , marking and quality certificate for stainless steel wires.
This standard is applicable to stainless steel wires (hereinafter referred to as steel wires), but excluding stainless steel wires for cold heading, cold forging and welding, and stainless steel spring wires of austenitic type and PH type.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 222 Permissible tolerances for chemical composition of steel products
GB/T 223.4 Alloyed steel - Determination of manganese content - Potentiometric or visual titration method
GB/T 223.9 Iron, steel and alloy - Determination of aluminium content - Chrom 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 copper 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 methods for the determination of nitrogen content after distillation separation
GB/T 223.40 Iron, steel and alloy - Determination of niobium content by the sulphochlorophenol S spectrophotometric method
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 Steel and iron - 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
GB/T 342-2017 Dimension shape mass and tolerance for cold-drawn round square and hexagonal steel wires
GB/T 2103-2008 General provisions for checking, packing, marking and quality certification of steel wire
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 specimen 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 condition
3.1.1
soft
steel wire with the surface oxide scale removed through pickling or similar treatment after bright heat treatment or heat treatment
3.1.2
lightly drawn
steel wire drawn to the finished product dimension at a smaller reduction rate after heat treatment
3.1.3
cold drawn
steel wire conventionally drawn after heat treatment, i.e. the processing through pressure forming methods such as die drawing and roller drawing
3.2 Surface condition
3.2.1
gray
steel wire with lackluster surface after processing such as dry drawing and heat treatment
3.2.2
bright
steel wire with bright surface after processing such as wet drawing and heat treatment
3.2.3
cleanliness
steel wire with clean surface after processing such as drawing and heat treatment
3.2.4
coating
steel wire with surface coated or plated
4 Order information
Contracts or orders made shall cover the following items:
a) No. of this standard;
b) product name;
c) designation;
d) dimension and shape (see Clause 6);
e) weight (or quantity);
f) delivery condition and surface condition (see 7.2);
g) other requirements.
5 Classification, designation and code
Steel wires are classified into four types according to texture, with their types, designations, delivery conditions and codes shown in Table 1.
Table 1 Type, designation, delivery condition and code of steel wire
Type Designation Delivery condition and code
Austenitic steel Soft (S), slightly drawn (LD), cold drawn (WCD)
Austenitic-ferritic steel Soft (S)
Ferritic steel Soft (S), slightly drawn (LD), cold drawn (WCD)
Martensitic steel Soft state (S), slightly drawn (LD)
Soft (S)
6 Dimensions and shapes
6.1 The nominal dimension range of soft steel wire is 0.05~16.0mm, while that of lightly drawn steel wire and cold drawn steel wire is 0.30~16.0mm and 0.10~12.0mm respectively.
6.2 The permissible deviation of steel wire dimension shall be in accordance with the requirements of Grade 11, Table 2, GB/T 342-2017. As negotiated by the parties and indicated in the contract, steel wires with other permissible deviation may be provided.
6.3 The out-of-roundness of steel wire shall not be greater than half of the diameter tolerance.
6.4 The steel wires shall be delivered by coils, reels, tightly layered winding with/without mandrel and containers. The coil and tightly layered winding shall be regular, and the wire in it shall not be scattered, twisted or knotted when opened. It shall be ensured that the reels and containers shall enable smooth setting-out and their ends shall be clearly marked. The delivery method, where not specified by the purchaser, shall be decided by the supplier.
6.5 The inner diameter of steel wire coil shall conform to the requirements of Table 2. The coil diameter, where specially required by the purchaser, shall be agreed by the supplier and the purchaser.
6.6 The length of straight steel wire and its permissible deviation shall meet the requirements of Grade II in Table 6 of GB/T 342-2017. The dimension, shape and permissible deviation of polished steel wire shall conform to the requirements of GB/T 3207-2008. Unless otherwise specified by the purchaser, the permissible deviation of diameter shall comply with the requirements of Grade h11 in GB/T 3207-2008.
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Order information
5 Classification, designation and code
6 Dimensions and shapes
7 Technical requirements
8 Test methods
9 Inspection rules
10 Packaging, marking and quality certificate
Annex A (Informative) Designation cross-references between this standard and other domestic and foreign standards
