1 Scope
This standard specifies the technical requirements, inspection methods and inspection rules for the bearing rings made from 45 steel meeting the requirements of GB/T 699-1999 or the quality carbon structural steels with equivalent performance after forging or forging annealing and quenching and tempering as well as the technical requirements, inspection methods and inspection rules for the carburizing, quenching and tempering of the carbon steel balls made from 10 and 15 quality carbon structural steels or carbon steels with the similar carbon content and mechanical property.
This standard is applicable to the heat treatment quality inspection of bearing parts made from above-mentioned steels. Bearing parts with special requirements and carbon steel balls for other purposes shall comply with the requirements of product drawing.
2 Normative References
The following standards contain provisions which, through reference in this text, constitute provisions of this standard. For dated reference, subsequent amendments to (excluding corrections to), or revisions of, any of these publications do not apply. However, the parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the standards. For undated references, the latest edition of the normative document referred to applies.
GB/T 230.1-2004 Metallic Rockwell Hardness Test-Part 1: Test Method (Scales A, B, C, D, E, F, G, H, K, N, T) (ISO 6508-1: 1999, MOD)
GB/T 231.1-2002 Metallic Materials - Brinell Hardness Test - Part 1: Test Method (eqv ISO 6506-1: 1999)
GB/T 699-1999 Quality Carbon Structural Steels
JB/T 1255-2001 Specification for Heat-treatment of Rolling Bearing Parts Made from High Carbon Chromium Steel
JB/T 7361-2007 Rolling Bearings-Test Method for Hardness of Parts
JB/T 7362-2007 Rolling Bearings - Determination of Decarburized Depth for Parts
JB/T 8881-2001 Specifications for Carburizing Heat Treatment of Rolling Bearing Parts
Contents
Foreword I
1 Scope
2 Normative References
3 Technical Requirements of Rings
3.1 Forging or Annealing
3.2 Quenching and Tempering
4 Technical Requirements of Carbon Steel Balls after Carburized Quenching and Tempering
4.1 Surface Carbon Content
4.2 Hardness
4.3 Effective Hardening Depth
4.4 Microstructure
4.5 Cracks
4.6 Decarburized Layer and Soft Spot
4.7 Crushing Load
5 Inspection Methods and Inspection Rules
Appendix A (Normative) Crushing Load Values after Carburized Quenching and Tempering and of Finished Carbon Steel Balls
