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GB/T 34891-2017: Rolling Bearings - Parts Made from High-carbon Chromium Bearing Steels - Specifications for Heat Treatment Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid
Similar standardsGB/T 34891-2017: Rolling Bearings - Parts Made from High-carbon Chromium Bearing Steels - Specifications for Heat Treatment---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/GBT34891-2017 NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 21.100.20 J 11 Rolling Bearings - Parts Made from High-carbon Chromium Bearing Steels - Specifications for Heat Treatment Issued on. NOVEMBER 01, 2017 Implemented on. MAY 01, 2018 Issued by. General Administration of Quality Supervision, Inspection and Quarantine; Standardization Administration of the People's Republic of China. Table of ContentsForeword... 3 1 Scope... 4 2 Normative references... 4 3 Technical Requirements... 5 4 Test method... 8 Appendix A (Informative) Effective wall thickness of the ferrule and effective diameter of the roller... 16 Appendix B (Normative) Steel ball crushing load test procedure and crushing load value after heat treatment... 18 Appendix C (Normative) Decarburization depth of bearing parts after quenching ... 21 Appendix D (Informative) Allowable deformation of bearing ferrule after quenching and tempering... 22 Appendix E (Informative) Residual austenite content of bearing part after quenching and tempering... 25 Appendix F (Normative) Curved surface hardness correction... 26 Appendix G (Normative) Pickling inspection procedure... 28 References... 31ForewordThis Standard was drafted in accordance with the rules given in GB/T 1.1-2009. This Standard was proposed by China Machinery Industry Federation. This Standard shall be under the jurisdiction of National Rolling Bearing Standardization Technical Committee (SAC/TC 98). The drafting organizations of this Standard. Luoyang Bearing Research Institute Co., Ltd., Zhejiang Tianma Bearing Group Limited Company, Zhejiang XCC Group Co., Ltd., Dong’e Shandong Steel Ball Group Co., Ltd., Jiangsu Lixing General Steel Ball Co., Ltd., Pizhou Power-Steering Bearing Co., Ltd., Xinchang Hengli Bearings Co., Ltd., Shandong Yujie Bearing Manufacturing Co., Ltd., Hebei Xintai Bearing Forging Co., Ltd., Zhejiang Jinhuan Bearing Co., Ltd., Yanshan University, Ruilian Machinery (Hangzhou) Co., Ltd., Dong E County Hua Tao Steel Ball Co., Ltd. Zhejiang Zhongji Casting & Forging Co., Ltd., Changzhou Longpont Lube Co., Ltd., Chongqing Changjiang Bearing Co., Ltd. The drafters of this Standard. Lei Jianzhong, Shi Dafang, Wang Mingzhou, Hu Linzhuang, Yang Yong, Ma Lin, Mei Yali, Zhang Yunxi, Xiao Caichao, Cai Meigui, Li Jingui, Dong Guanjun, Zhang Fucheng, Zhang Zhenhua, Fan Zhiguo, Hu Weiyong, Geng Wei, Zhao Xingxin. Rolling Bearings - Parts Made from High-carbon Chromium Bearing Steels - Specifications for Heat Treatment1 ScopeThis Standard specifies the technical requirements and test methods for annealing, quenching and tempering of G8Cr15, GCr15, GCr15SiMn, GCr15SiMo, GCr18Mo steel rolling bearing rings and rolling elements (hereinafter referred to as bearing parts) in accordance with GB/T 18254. This Standard is applicable to the heat treatment quality inspection of the above-mentioned steel bearing parts process and finished parts, and also to the heat treatment quality inspection of other high-carbon chromium steel bearing parts. For bearing parts with special requirements, perform according to the specifications of corresponding product drawings.2 Normative referencesThe following documents are indispensable for the application of this document. For dated references, only the dated version applies to this document. For undated references, the latest edition (including all amendments) applies to this document. GB/T 230.1-2009, Metallic materials. Rockwell hardness test. Part 1.Test method (scales A, B, C, D, E, F, G, H, K, N, T) GB/T 231.1, Metallic materials. Brinell hardness test. Part 1.Test method GB/T 272-2017, Rolling bearings. Identification code GB/T 1172, Conversion of hardness and strength for ferrous metal GB/T 4340.1, Metallic materials. Vickers hardness test. Part 1.Test method GB/T 6394, Determination of estimating the average grain size of metal GB/T 17394, Metallic materials - Leeb hardness test GB/T 24606, Rolling bearings. Non-destructive testing. Magnetic particle testing JB/T 7361, Rolling bearings. Test method for hardness of parts JB/T 7362, Rolling bearing. Determination of decarburized depth for parts3 Technical Requirements3.1 Technical requirements of bearing parts after spheroidizing annealing The technical requirements of bearing parts after spheroidizing annealing are as specified Table 1. 3.2 Technical requirements of bearing parts after martensite quenching and tempering4 Test methodThe test method is as specified in Table 7.Appendix A(Informative) Effective wall thickness of the ferrule and effective diameter of the roller For the effective wall thickness of the ferrule and the effective diameter of the roller, see Figure A.1.Appendix B(Normative) Steel ball crushing load test procedure and crushing load value after heat treatment B.1 Scope This appendix specifies the crushing load test procedure and crushing load value for steel balls whose nominal diameter is ɸ3 mm ~ ɸ50.8 mm. B.2 Steel ball crushing load test procedure B.2.1 For each batch of heat-treated steel balls, take three sets of balls (9 pieces) for the ball crushing load test. The dimensional tolerances of the steel balls shall be the same. B.2.2 When the semi-finished steel ball after heat treatment is taken for the crushing test, the surface of the steel ball is not allowed to have surface defects such as wheel injury, pit, bump or pitting. B.2.3 When the crushing test is carried out, the loading speed can be loaded as per 980 N/s ~ 5 880 N/s. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. 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