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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 24588-2009 Stainless steel wires for spring. The following technical changes have been made with respect to GB/T 24588-2009:
——The requirements for tolerance of steel wire diameter are strengthened (see 6.2; 6.2 of Edition 2009);
——Four designations (namely 07Cr19Ni10, 06Cr18Ni11Ti, 12Cr18Mn12Ni2N and 04Cr12Ni8Cu2TiNb) and related technical requirements are added (see Tables 1, 4, 5, 6 and 7; Tables 1, 4 and 5 of Edition 2009);
——Some designation representations are adjusted, 06Cr19Ni9 is changed to 06Cr19Ni10, 06Cr19Ni9N is changed to 06Cr19Ni10N, 12Cr17Mn8Ni3Cu3N is changed to 12Cr16Mn8Ni3Cu3N (see Tables 1, 4 and 5; Tables 1, 4 and 5 of Edition 2009);
——The nitrogen contents of 12Cr18Mn9Ni5N and 12Cr16Mn8Ni3Cu3N are tightened and changed from 0.05% ~ 0.30% to 0.05% ~ 0.25% (see Table 4; Table 4 of Edition 2009);
——The dimension range of steel wire torsion test is expanded, and the nominal diameter is changed from 0.50mm~4.00mm to 0.50mm~6.00mm (see 7.5.1; 7.5.1 of Edition 2009);
——The requirements for the surface state of steel wire are modified (see 7.2.2; 7.2.2 of Edition 2009);
——Technical requirements and methods for intergranular corrosion test of austenitic type stainless steel are added (see 7.7 and Table 8);
——Cross-reference of designations between different editions of this standard is added (see Annex A).
This standard was proposed by the 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 edition of this standard is as follows:
——GB/T 24588-2009.
Stainless steel spring wires
1 Scope
This standard specifies the terms and definitions, order contents, designation and group, dimension, shape, mass and tolerance, technical requirements, test methods, inspection rules, packaging, marking and quality certificate of stainless steel spring wires.
It is applicable to the fabrication austenitic type and precipitation hardening type stainless steel spring wire.
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 223.5 Steel and iron - Determination of Acid-Soluble Silicon and Total Silicon Content - Reduced Molybdosilicate Spectrophotometric Method
GB/T 223.8 Methods for chemical analysis of iron, steel and alloy－The sodium fluoride separation-EDTA titration method for the determination of aluminium content
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 223.40 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 223.64 Iron, steel and alloy - Determination of manganese content - Flame atomic absorption spectrometric method
GB/T 223.85 Steel and iron - Determination of sulfur content - Infrared absorption method after combustion in an induction furnace
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 238 Metallic materials - Wire - Reverse bend test
GB/T 239.1 Metallic materials - Wire - Part 1: Simple torsion test
GB/T 342-2017 Dimension, shape, mass and tolerance of cold-drawn round, square and hexagonal steel wires
GB/T 2103-2008 General requirements for acceptance, packing, marking and quality certification of steel wire
GB/T 2976 Metallic materials - Wire - Wrapping test
GB/T 4240 Stainless steel wires
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 terms and definitions given in GB/T 4240 and GB/T 20878 and the following apply.
3.1
pitch
cut out several circles of steel wire from coil or spool , and put them at free state and cut out a complete circle of steel wire, then suspend it freely at midpoint, the distance between both ends of steel wire coil in the axial direction is the pitch
3.2
diameter of free ring
cut out several circles of steel wire from coil or spool and put them at free state, then cut out a complete circle of steel wire and put it freely on the horizontal plane, the outer diameter of steel wire coil is the diameter of free ring
4 Order contents
Contracts or orders made based on this standard shall cover the following items:
a) reference to this standard;
b) product name;
c) designation;
d) dimension and shape (see Clause 6);
e) weight (or quantity);
f) delivery state (see 7.2);
g) other requirements.
5 Designation and group
Steel wire can be classified into 4 groups according to designation and tensile strength grade, and applicable tensile strength group and corresponding nominal diameter range of each designation is specified in Table 1.
Table 1 Designation, group and corresponding nominal diameter range of steel wire
Designation Group Nominal diameter range /mm
a This designation should not be used in environment of higher corrosion resistance requirements.
6 Dimension, shape, mass and tolerance
6.1 Nominal diameter range of steel wire is as shown in Table 1
6.2 The tolerance of steel wire diameter shall meet those specified for Grade 11, Table 2, GB/T 342-2017. As agreed by the supplier and purchaser and indicated in the contract, steel wires with other tolerance may be provided.
6.3 The out-of-roundness of steel wire shall not be larger than half of the diameter tolerance.
6.4 Steel wire shall be delivered in coils or spools. The coil shall be neat, and the steel wire in it shall not be scattered, twisted, wrapped or knotted when opening the coil. The spool shall ensure smooth pay-off and the end shall be clearly marked. Its pitch and diameter of free ring shall meet those specified in Table 2.
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Order contents
5 Designation and group
6 Dimension, shape, mass and tolerance
7 Technical requirements
8 Test methods
9 Inspection rules
10 Packing, marking and quality certification
Annex A (Informative) The designation cross-references between this standard and foreign standards.
