1 Scope
This standard specifies the technical requirements and test methods of the annealed, quenched and tempered rolling bearing ring and rolling element (hereinafter referred to as "bearing parts") made from GCr15, GCr15SiMn, GCr15SiMo and GCr18Mo steels which meet those specified in GB/T 18254-2002.
This standard is applicable to the heat treatment quality test of bearing parts during process and finished parts made from above-mentioned steels and also applicable to the heat treatment quality test of bearing parts made from other high-carbon chromium steels. The bearing parts with special requirements shall be in accordance with corresponding product drawings.
2 Normative References
The following referenced documents are indispensable for the application of this document. For dated references, only the dated editions apply. For undated references, the latest editions (including any amendments) apply.
GB/T 230.1 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 1172 Conversion of Hardness and Strength for Ferrous Metal
GB/T 4340.1 Metallic Materials - Vickers Hardness - Part 1: Test Method
GB/T 6394 Metal - methods for Estimating the Average Grain Size
GB/T 17394 Metallic Materials - Leeb Hardness Test
GB/T 18254 High-carbon Chromium Bearing Steel
GB/T 24606 Rolling Bearings - Non-destructive Testing - Magnetic Particle Testing
JB/T 2974-2004 Rolling Bearings - Identification Code - Supplemental Regulations
JB/T 7361 Rolling Bearings - Test Method for Hardness of Parts
JB/T 7362 Rolling Bearings - Determination of Decarburized depth for Parts
3 Technical Repuirements
3.1 Technical requirements of bearing parts after spheroidizing annealing
The technical requirements of bearing parts after spheroidizing annealing shall be in accordance with those specified in Table 1.
3.2 Technical requirements of bearing parts martensite after quenching and tempering
3.2.1 Hardness
The hardness and hardness difference of the same bearing part after quenching and tempering of martensite shall be respectively in accordance with those specified in Table 2 and Table 3.
Table 1 Technical Requirements after Spheroidizing Annealing
Foreword I
1 Scope
2 Normative References
3 Technical Repuirements
4 Test Method
Appendix A (Informative) Effective Wall Thickness of Ring and Effective Diameter of Rollers
Appendix B (Normative) Test Specifications for Crushing Load of Steel Ball and Crushing Load Values
Appendix C (Informative) Decarburized Layer Depth of Bearing Parts after Quenching and Tempering
Appendix D (Informative) Allowable Deformation of Bearing Ring after Quenching and Tempering
Appendix E (Informative) Residual Austenite Content of Bearing Parts after Quenching and Tempering
Appendix F (Normative) Hardness Correction of Curved Surface
Appendix G (Normative) Acid Cleaning Inspection Specifications
1 Scope
This standard specifies the technical requirements and test methods of the annealed, quenched and tempered rolling bearing ring and rolling element (hereinafter referred to as "bearing parts") made from GCr15, GCr15SiMn, GCr15SiMo and GCr18Mo steels which meet those specified in GB/T 18254-2002.
This standard is applicable to the heat treatment quality test of bearing parts during process and finished parts made from above-mentioned steels and also applicable to the heat treatment quality test of bearing parts made from other high-carbon chromium steels. The bearing parts with special requirements shall be in accordance with corresponding product drawings.
2 Normative References
The following referenced documents are indispensable for the application of this document. For dated references, only the dated editions apply. For undated references, the latest editions (including any amendments) apply.
GB/T 230.1 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 1172 Conversion of Hardness and Strength for Ferrous Metal
GB/T 4340.1 Metallic Materials - Vickers Hardness - Part 1: Test Method
GB/T 6394 Metal - methods for Estimating the Average Grain Size
GB/T 17394 Metallic Materials - Leeb Hardness Test
GB/T 18254 High-carbon Chromium Bearing Steel
GB/T 24606 Rolling Bearings - Non-destructive Testing - Magnetic Particle Testing
JB/T 2974-2004 Rolling Bearings - Identification Code - Supplemental Regulations
JB/T 7361 Rolling Bearings - Test Method for Hardness of Parts
JB/T 7362 Rolling Bearings - Determination of Decarburized depth for Parts
3 Technical Repuirements
3.1 Technical requirements of bearing parts after spheroidizing annealing
The technical requirements of bearing parts after spheroidizing annealing shall be in accordance with those specified in Table 1.
3.2 Technical requirements of bearing parts martensite after quenching and tempering
3.2.1 Hardness
The hardness and hardness difference of the same bearing part after quenching and tempering of martensite shall be respectively in accordance with those specified in Table 2 and Table 3.
Table 1 Technical Requirements after Spheroidizing Annealing
Contents of JB/T 1255-2014
Foreword I
1 Scope
2 Normative References
3 Technical Repuirements
4 Test Method
Appendix A (Informative) Effective Wall Thickness of Ring and Effective Diameter of Rollers
Appendix B (Normative) Test Specifications for Crushing Load of Steel Ball and Crushing Load Values
Appendix C (Informative) Decarburized Layer Depth of Bearing Parts after Quenching and Tempering
Appendix D (Informative) Allowable Deformation of Bearing Ring after Quenching and Tempering
Appendix E (Informative) Residual Austenite Content of Bearing Parts after Quenching and Tempering
Appendix F (Normative) Hardness Correction of Curved Surface
Appendix G (Normative) Acid Cleaning Inspection Specifications
