GB/T 34891-2017 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 34891-2017 | English | 165 |
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Rolling Bearings - Parts Made from High-carbon Chromium Bearing Steels - Specifications for Heat Treatment
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GB/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 Contents
Foreword... 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... 31
Foreword
This 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
Treatment
1 Scope
This 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 references
The 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 parts
3 Technical Requirements
3.1 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 tempering
4 Test method
The 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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