Standard No.:	JB/T 11087-2011
English Name:	Rolling bearings － Parts made from W-series steel elevated temperature－ Specifications for heat-treatment
Chinese Name:	滚动轴承 钨系高温轴承钢零件 热处理技术条件
Chinese Classification:	J11    Rolling bearing
Professional Classification:	JB    Professional Standard - Machinery
ICS Classification:	21.100.20 21.100.20    Rolling bearings 21.100.20
Source Content Issued by:	MIIT
Issued on:	2011-8-15
Implemented on:	2011-11-1
Status:	valid
Target Language:	English
File Format:	PDF
Word Count:	3000 words
Translation Price(USD):	264.0
Delivery:	via email in 1 business day

1 Scope This standard specifies technical requirements and inspection method of rolling bearings ferrule made from W-series (such as W9Cr4V2Mo and W18Cr4V) steel elevated temperature as well as rolling elements (hereinafter referred to as “parts”) after annealing, quenching and tempering. This standard is applicable to the heat treatment quality inspection of bearing parts made from above-mentioned materials. 2 Normative References The following normative documents contain provisions which, through reference in this standard, constitute provisions of this standard. For dated reference, subsequent amendments (excluding corrections to) to, or revisions of, any of these publications do not apply. However, all parties coming to an agreement according to this standard are encouraged to study whether the latest edition of these documents is applicable. For undated references, the latest editions of the normative documents apply. 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) (ISO 6508-1: 2005, MOD) GB/T 231.1-2009 Metallic Materials-Brinell Hardness Test-Part 1: Test Method (ISO 6506-1: 2005, MOD) GB/T 4340.1-2009 Metallic Materials-Vickers Hardness Test-Part 1: Test Method (ISO 6507-1: 1997, MOD) GB/T 24606-2009 Rolling bearings-Non-destructive Testing-Magnetic Particle Testing JB/T 1255-2001 Specification for Heat-treatment of Rolling Bearing Parts Made from High Carbon Chromium Steel JB/T 2850-2007 Rolling Bearings-Parts Made from Cr4Mo4V Bearing Steel Elevated Temperature-Specification for Heat-treatment JB/T 7361-2007 Rolling Bearings-Test Method for Hardness of Parts JB/T 7362-2007 Rolling Bearings-Determination of Decarburized Depth for Parts

Contents Foreword I 1 Scope 2 Normative References 3 Technical Requirements 3.1 Technical Requirements of Bearing Parts after Annealing 3.2 Technical Requirements of Bearing parts after Quenching and Tempering 4 Inspection Methods Appendix A (Normative) Crushing Test Load of Steel Ball Appendix B (Informative) Inspection Regulation of Pickling B.1 Inspection Regulation of Cold Pickling B.2 Inspection Regulations of Hot Pickling Table 1 Decarburized Layer Depth of Bearing Parts after Quenching and Tempering Table 2 Inspection Methods Table A.1 Crushing Load of Steel Ball