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GB/T 18579-2019: High-carbon Chromium Bearing Steel Wires Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid GB/T 18579: Historical versions
Similar standardsGB/T 18579-2019: High-carbon Chromium Bearing 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/GBT18579-2019NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 77.140.65 H 49 Replacing GB/T 18579-2001 High-carbon Chromium Bearing Steel Wires Issued on. DECEMBER 10, 2019 Implemented on. JULY 1, 2020 Issued by. State Administration for Market Regulation; Standardization Administration of the People’s Republic of China. Table of ContentsForeword... 3 1 Scope... 5 2 Normative References... 5 3 Classification and Code... 7 4 Order Content... 7 5 Dimensions, Appearances, Weights and Allowable Deviations... 8 6 Technical Requirements... 10 7 Test Methods... 13 8 Inspection Rules... 15 9 Packaging, Marking and Quality Certificate... 16ForewordThis Standard was drafted in accordance with the rules in GB/T 1.1-2009. This Standard serves as a replacement of GB/T 18579-2001 High-carbon Chromium Bearing Steel Wires. In comparison with GB/T 18579-2001, the main changes in technical content are as follows. ---The classification of steel by metallurgical quality is added (see 3.1); ---Continuous cast steel is added (see 3.2); ---The classification of steel by product’s final purposes is added (see 3.3); ---The delivery state of “phosphating cold-drawn” is added; the delivery state of polishing is deleted (see 3.4; 3.1 in Version 2001); ---The diameter range of steel wires is modified; the requirements of the allowable deviation of diameter become more rigorous (see 5.1.1 and 5.1.2; 5.1.1 and 5.1.2 in Version 2001); ---The requirements of straightness are modified (see Table 3; Table 1 in Version 2001); ---The requirements of coil weight are modified (see 5.3; 5.3 in Version 2001); ---Designation G8Cr15 and relevant requirements are added (see 6.1.1); ---The requirements of low magnification of steel wires are modified (see 6.4; 6.4 in Version 2001); ---The requirements of steel wire fractures are deleted (see 6.4 in Version 2001); ---The requirements of mechanical property of cold-drawn and phosphating cold- drawn steel wires are added (see 6.5); ---Quenching hardness test of sample is deleted (see 7.5 in Version 2001); ---The requirements of carbide band are added (see 6.7); ---The requirements of steel wire decarburization layer and surface quality are modified (see 6.9 and 6.11; 6.6.5 and 6.7 in Version 2001); ---In re-inspection and determination rules, the stipulation that allows the replacement of materials with billets and the replacement of large pieces with small pieces is added (see 8.4.3). This Standard was proposed by China Iron and Steel Industry Association. This Standard shall be under the jurisdiction of National Technical Committee 183 on Iron and Steel of Standardization Administration of China (SAC/TC 183). The drafting organizations of this Standard. DONGBEI Special Steel Group Co., Ltd.; Jiangyin XINGCHENG Special Steel Works Co., Ltd.; Luoyang Bearing Research Institute Co., Ltd.; Shandong DONGE Steel Ball Group Co., Ltd.; Wuxi KAIMING Metal Product Co., Ltd.; MCC Construction Research Institute Co., Ltd.; MCC Testing & Certification Co., Ltd.; China Metallurgical Information and Standardization Institute. The main drafters of this Standard. Kangge, Xie Yaping, Gong Chunlin, Baiyun, Lu Changhe, Lei Jianzhong, Yangyong, Zhu Meijuan, Liudong, Mengyu, Zhang Jianfeng, Wang Shanshan, Hanbing, Li Xiaobin, Wang Lingjun, Leng Mingjian, Wangyong. The issuing of the previous versions of the standard replaced by this Standard is as follows. ---GB/T 18579-2001. High-carbon Chromium Bearing Steel Wires1 ScopeThis Standard stipulates the classification and code, order content, dimensions, appearances, weights and allowable deviations, technical requirements, test methods, inspection rules, packaging, marking and quality certificate of high-carbon chromium bearing steel wires. This Standard is applicable to high-carbon chromium bearing steel wires used in the manufacturing of bearing rolling elements and rings (hereinafter referred to as steel wires).2 Normative ReferencesThe following documents are indispensable to the application of this document. In terms of references with a specified date, only versions with a specified date are applicable to this document. In terms of references without a specified date, the latest version (including all the modifications) is applicable to this document. 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 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 223.23 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 Method for Chemical Analysis of Iron, Steel and Alloy - The Carrier Precipitation - Molybdenum Blue Photometric Method for the Determination of Antimony Content3 Classification and Code3.1 By metallurgical quality, steel can be divided into. 3.2 By casting process, steel can be divided into. 3.3 By product’s final purpose, steel can be divided into. 3.4 The classification and code of steel wires by the delivery state are shown in Table 1.When other delivery states are requested, this shall be indicated in the contract.4 Order ContentOrder content shall be indicated in the contract and shall include the following content.5 Dimensions, Appearances, Weights and Allowable Deviations5.1 Dimensions 5.1.1 The nominal diameter range of steel wires is 1.00 mm ~ 20.00 mm. 5.2 Appearances 5.2.1 Coil state Each coil of steel wire shall be constituted of one steel wire. Coil shall be put in order. When open a coil, steel wire shall not be scattered, twisted, tangled or knotted. 5.2.2 Straight state 5.2.3 Out-of-roundness Out-of-roundness of steel wires shall be not more than a half of diameter tolerance of steel wires. 5.3 Weights 5.3.1 The minimum internal diameter and minimum weight of each coil of steel wire shall comply with the stipulations in Table 4. 5.3.2 Steel wire whose coil weight is less than the minimum coil weight, but not less than 50 kg, is allowed. However, its weight shall not exceed 5% of the weight of that batch.6 Technical Requirements6.1 Designation and Chemical Composition 6.1.1 The designations of steel are. GCr15 and G8Cr15.The chemical composition (smelting analysis) shall comply with the stipulations in GB/T 18254-2016. 6.2 Smelting Method Steel shall adopt vacuum degassing. Unless user’s consent has been obtained, the manufacturer shall not intentionally add calcium and its alloy deoxidation, or, control 6.4 Low Magnification The low magnification of steel wires used for rolling elements shall comply with the stipulations in Table 5.The low magnification of steel wires used for rings shall comply with the stipulations of high-quality steel and advanced high-quality steel in GB/T 18254-2016. 6.5 Mechanical Property In terms of steel wires whose nominal diameter is not more than 10 mm, inspect tensile strength. In terms of steel wires whose nominal diameter is more than 10 mm, inspect Brinell hardness. The result shall comply with the stipulations in Table 6. 6.6 Microstructure The microstructure of steel wires shall be fine, uniform and completely spheroidized pearlite structure. Inspect in accordance with the 5th rating chart in Appendix A of GB/T 18254-2016; the qualification level is Level 2 ~ Level 4. 6.7 Carbide Heterogeneity Delivery State Tensile Strength/MPa Brinell Hardness/HBW 6.12 Special Requirements In accordance with the demand-side’s demands, through the negotiation between the demand-side and the supply-side, and indication in the contract, the following special requirements may be proposed.7 Test Methods7.1 Dimensions and Appearances Each batch of steel wires shall receive appearance and dimensional inspection (if the supply-side can guarantee that the dimensions of straight steel wires are qualified, then, conduct spot check in accordance with a certain proportion) per coil (PCS). 7.2 Chemical Composition Analysis 7.2.1 Methods of chemical composition analysis shall comply with the general methods in GB/T 223.5, GB/T 223.9, GB/T 223.11, GB/T 223.23, GB/T 223.26, GB/T 223.29, GB/T 223.31, GB/T 223.47, GB/T 223.50, GB/T 223.53, GB/T 223.62, GB/T 223.63, GB/T 223.77, 7.2.2 Oxygen content sample shall be inspected after thoroughly eliminating the decarburization layer. The analysis method shall comply with GB/T 11261. Nominal Diameter of Steel Wires (D) Single-sided Defect Depth, not more than 7.2.3 Titanium content analysis method shall be determined by the demand-side and the supply-side through negotiation. 7.3 Mechanical Property 7.3.1 Tensile strength test. from both ends (in terms of straight steel wire. from any end) of steel wire coil, take a sample whose length is not less than 250 mm; test the tensile strength. Test method shall comply with the stipulations in GB/T 228.1. 7.4 Low Magnification On different coils (PCS) of steel wire, randomly take 6 samples. In accordance with the stipulations in 7.5 in GB/T 18254-2016, test the low magnification. 7.5 Surface Quality 7.5.1 From both ends of each coil of steel wire, respectively take a sample whose length is not less than 250 mm, under acid pickling, inspect the surface quality of the steel wire (firstly, remove one end whose length is not less than 500 mm, then, take a sample, under acid pickling, inspect the surface quality). After sulfuric acid or hydrochloric acid pickling, inspect the sample. 7.7 Determination All the microscopic inspections are based on the most severe field of view or area on the sample inspection surface.8 Inspection Rules8.1 Inspection and Acceptance Inspection The quality of steel wires shall receive exit-factory inspection conducted by the supply- side’s technical supervision department. 8.2 Group Rules Steel wires shall receive inspection and acceptance inspection by batches. Each batch shall be constituted of steel wires of the same smelting furnace number, the same dimensions, the same heat treatment charge plan and the same delivery state. 8.3 Sampling Quantity and Sampling Part The sampling quantity and sampling part of steel wires shall comply with the stipulations in Table 9. 8.4 Re-inspection and Determination Rules 8.4.1 Among all the inspection items, when any inspection item is disqualified (excluding non-metallic inclusion, carbide liquefaction and white dot), re-sampling and re-inspection of the disqualified item are allowed. 8.4.2 When oxygen content is disqualified, on different PCS of finished products, randomly take 3 samples to conduct re-inspection. The average value of the re- inspection result shall be not more than the value stipulated by standard; 1 sample is allowed to exceed the value stipulated by the standard, but it shall not exceed the numerical value of the standard value after adding 0.0003%.9 Packaging, Marking and Quality CertificateThe packaging, marking and quality certificate of steel wires shall comply with the stipulations in GB/T 2103. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of English version of GB/T 18579-2019 be delivered?Answer: The full copy PDF of English version of GB/T 18579-2019 can be downloaded in 9 seconds, and it will also be emailed to you in 9 seconds (double mechanisms to ensure the delivery reliably), with PDF-invoice.Question 2: Can I share the purchased PDF of GB/T 18579-2019_English with my colleagues?Answer: Yes. 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