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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 18579-2001 "High-carbon chromium bearing steel wires".
The following main technical changes have been made with respect to GB/T 18579 - 2001:
——The classification of steel by metallurgical quality (see 3.1) was added;
——Continuous casting steel was added (see 3.2);
——Classification of steel by product end-use is added(see 3.3);
—— “Phosphating cold drawing" delivery status is added and polished delivery status is added (see 3.4; 3.1 in Edition 2001);
——The diameter range of steel wire is modified and the permissible deviation requirements of diameter is tightened (see 5.1.1 and 5.1.2; 5.1.1 and 5.1.2 in Edition 2001);
——The straightness requirements are modified (see Table 3; Table 1 of Edition 2001);
——The coil weight requirements are modified (see 5.3, 5.3 of Edition 2001);
——Designation G8Cr15 and related requirements are added (see 6.1.1);
——The low magnification requirements of steel wires are modified (see 6.4; 6.4 of Edition 2001);
——The requirements for steel wire fracture (see 6.4 of the Edition 2001);
——Mechanical property requirements of cold-drawn and phosphating cold-drawn steel wires are added (see 6.5);
——The test for quenching hardness of the specimen is deleted (see 7.5 of Edition 2001);
——The requirements of carbide banding are added (see 6.7);
——The requirements for decarburized layer and surface quality of steel wires are modified (see 6.9 and 6.11; 6.6.5 and 6.7 of Edition 2001);
——In the re-inspection and judgment rules, “it is allowed to replace materials with blanks and replace small ones with greater ones” is added (see 8.4.3).
This standard was proposed by China Iron and Steel Association.
This standard is under the jurisdiction of SAC/TC 183 National Technical Committee on Iron and Steel of Standardization Administration of China.
The previous edition of this standard is as follows:
——GB/T 18579-2001.
High-carbon chromium bearing steel wires
1 Scope
This standard specifies the classifications and designations, order contents, dimension, shape, weight and permissible tolerance, technical requirements, test methods, inspection rules, packaging, marking and quality certificate of high-carbon chromium bearing steel wires.
This standard is applicable to the manufacture of high-carbon chromium bearing steel wires (hereinafter referred to as steel wires) for bearing rolling elements and rings.
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 (including any amendments) applies.
GB/T 223.5 Steel and iron - Determination of acid-soluble silicon and total silicon content - Reduced molybdosilicate spectrophotometric method
GB/T 223.9 Iron, steel and alloy—Determination of aluminium 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 223.23 Iron, steel and alloy - Determination of nickel content - The dimethylglyoxime spectrophotometric method
GB/T 223.26 Iron, steel and alloy - Determination of molybdenum content - The thiocyanate spectrophotometric method
GB/T 223.29 Iron, steel and alloy - Determination of lead content - Carrier precipitation - Xylenol orange spectrophotometric method
GB/T 223.31 Iron, steel and alloy - Determination of arsenic content - Distillation - Molybdenum blue spectrophotometric method
GB/T 223.47 Methods for chemical analysis of iron, steel and alloy - The carrier precipitation - Molybdenum blue potometric method for the determination of antimony content
GB/T 223.50 Methods for chemical analysis of iron, steel and alloy - The phenylfluorone-CTMAB direct photometric method for the determination of tin content
GB/T 223.53 Methods for chemical analysis of iron,steel and alloy - The flame atomic absorption spectrophotometric method for the determination of copper content
GB/T 223.62 Methods for chemical analysis of iron, steel and alloy - The butyl acetate extraction photometric method for the determination of phosphorus content
GB/T 223.63 Methods for chemical analysis of iron, steel and alloy - The sodium (potassium) periodate photometric method for the determination of manganese content
GB/T 223.77 Methods for chemical analysis of iron, steel and alloy - The flame atomic absorption spectrometric method for the determination of calcium content
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 224 Determination of the depth of decarburization of steels
GB/T 228.1 Metallic materials - Tensile testing - Part 1: Method of test at room temperature
GB/T 231.1 Metallic materials - Brinell hardness test - Part 1: Test method
GB/T 2103 General provisions for checking, packing, marking and quality certification of steel wire
GB/T 4336 Carbon and low-alloy steel - Determination of multi-element contents - Spark discharge atomic emission spectrometric method (routine method)
GB/T 11261 Steel and iron - Determination of oxygen content - The pulse heating inert gas fusion-infra-red absorption method
GB/T 18254-2016 High-carbon chromium bearing steel
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 20125 Low-alloy steel - Determination of multi-element contents - Inductively coupled plasma atomic emission spectrometric method
3 Classification and designation
3.1 Steel is classified into the following by metallurgical quality:
a) High quality steel;
b) High quality steel (with "A" after the designation);
c) Super high quality steel (with "E" after the designation).
3.2 Steel is classified into the following by casting process:
a) Die cast steel;
b) Continuous casting steel.
3.3 Steel is classified into the following by the end use of product:
a) G for rolling elements;
b) T for rings
3.4 The classification and code of steel wire by delivery status are shown in Table 1. Requirements for other delivery conditions shall be indicated in the contract.
Table 1 Delivery status classification and code of steel wires
Delivery status classification Code
Annealed A
Cold drawing WCD
Light drawing WLCD
Phosphating cold drawing STP + WCD
Phosphating light drawing STP+WLCD
4 Order information
The contents of the order shall be specified in the contract and include the following contents:
a) Product name;
b) Designation;
c) Standard No.;
d) Specification and shape (which shall be indicated in the contract when straight delivery is required);
e) Weight and/or quantity;
f) Casting method (continuous casting if not indicated);
g) Delivery state;
h) End use of product;
i) Others.
5 Dimension, shape, weight and permissible deviation
5.1 Dimension
5.1.1 The nominal diameter of steel wire is 1.00mm to 20.00mm.
5.1.2 The permissible diameter deviation of steel wires shall be as specified in Table 2. The permissible deviation of steel wire diameter shall be indicated in the contract. Otherwise, they shall be supplied according to Grade 10. According to the requirements of the purchaser, after negotiation between the two parties, steel wires with other specifications and permissible deviations can also be provided.
Table 2 Permissible deviation of steel wire diameter
Dimensions in millimeters
Nominal diameter of steel wire
D Grade of permissible deviation
Grade 8 Grade 9 Grade 10 Grade 11 Grade 12
Permissible deviation
1.00≤D<3.00 0
-0.014 0
-0.024 0
-0.040 0
-0.060 0
-0.100
3.00≤D<6.00 0
-0.018 0
-0.030 0
-0.048 0
-0.074 0
-0.120
6.00≤D<10.0 0
-0.022 0
-0.036 0
-0.058 0
-0.090 0
-0.150
10.0≤D<16.0 0
-0.026 0
-0.042 0
-0.070 0
-0.110 0
-0.180
16.0≤D≤20.0 0
-0.032 0
-0.052 0
-0.084 0
-0.130 0
-0.210
5.2 Shape
5.2.1 Coil
Each coil of steel wire shall consist of one steel wire. The coil shall be regular, and the wire in it shall not be scattered, twisted or knotted when opened.
5.2.2 Straight bar
5.2.2.1 When the wires are delivered in straight bars, the length shall be in accordance with the provisions of Table 3, and the wires shall be delivered in aligned ways, allowing short-length steel wire with a weight not exceeding 5% of the total weight and not shorter than the minimum length. When the purchaser requires fixed or double-length delivery, it shall be indicated in the contract, and the permissible deviation of its length shall be 0 to + 50mm.
5.2.2.2 The straightness of the straight steel wire shall meet the requirements of Table 3.
Table 3 Length and straightness of straight steel wires
Nominal diameter of steel wire/mm Length of straight steel wire/mm Straightness of straight steel wire / (mm/m)
≤8.00 2000 to 4000 ≤3
>8.00 3000 to 6000 ≤2
5.2.2.3 There shall be no flash or burr at the end of the straight steel wire.
5.2.3 Out-of-roundness
The out-of-roundness of steel wire shall not be larger than half of the diameter tolerance.
5.3 Weight
5.3.1 The minimum inner diameter and minimum weight of each coil of steel wire shall comply with the provisions in Table 4.
5.3.2 Steel wire with coil weight less than the minimum coil weight but not less than 50kg is allowed, but the weight shall not exceed 5% of the batch weight. After negotiation between the supplier and the purchaser, and it is indicated in the contract, the weight of the steel wire coil can be specified separately.
Foreword i
1 Scope
2 Normative references
3 Classification and designation
4 Order information
5 Dimension, shape, weight and permissible deviation
6 Technical requirements
7 Test methods
8 Inspection rules
9 Packaging, marking and quality certificate
