1 Scope
This standard specifies the technical requirements for the pre-heat treatment before carburization and the primary quenching and tempering, high-temperature tempering and secondary quenching and tempering after carburization as well as the inspection methods for average grain size, case-hardened depth, hardness, microscopic structure and crack etc. of the rolling bearing parts made from G20CrMo(A) ,G20CrNiMo(A), G20CrNi2Mo(A), G20Cr2Ni4(A), G10CrNi3Mo(A) and G20Cr2Mn2Mo(A) that meet the requirements of GB/T 3203.
This standard is applicable to the carburizing heat treatment quality inspection for the above-mentioned rolling bearing parts made from carburizing bearing steel, and also is applicable to the carburizing heat treatment quality inspection for rolling bearing parts made from low carbon alloy steel.
2 Normative References
The following references are indispensable for the application of this standard. For dated reference, only the dated editions are applicable to this standard. For undated references, the latest edition (including any amendments) is applicable to this standard.
GB/T 230.1 Metallic Materials - Rockwell Hardness Test - Part 1: Test Method (Scales A, B, C, D, E, F, G, H, K, N and T)
GB/T 231.1 Metallic Materials-Brinell Hardness Test-Part 1: Test Method
GB/T 3203 Specification for Carburizing Steels of Bearings
GB/T 6394 Metal-methods for Estimating the Average Grain Size
GB/T 9450 Steels-Determination and Verification of the Depth of Carburized and Hardened Cases
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 7361 Rolling Bearings-Test Method for Hardness of Parts
Contents
Foreword I
1 Scope
2 Normative References
3 Terms and Definitions
4 Technical Requirements
4.1 Technical Requirements for Pre-heat Treatment before Carburization
4.2 Technical Requirements for Carburizing Heat Treatment
5 Inspection Methods
Appendix A (Normative) Measurement Methods for Case-hardened Depth
A.1 Hardness Method
A.2 Macrofracture Method
A.3 Microstructure Analysis Method
Appendix B (Normative) Specification for Color Penetration Testing
B.1 Scope
B.2 Defect Indication and Judgment
B.3 Materials for Detection and Sensitivity Verification
B.4 Requirements for Workpiece Surface Detection
B.5 Operating Method
B.6 Inspection
