This standard specifies the technical requirements for GCr15, GCr15SiMn, GCr15SiMo and GCr18Mo steel rolling bearing parts after annealing, quenching and tempering and the inspection procedure for steel ball crushing load, cold and hot pickling, magnetic testing, etc.
This standard is applicable to heat-treatment quality inspection for above-mentioned steel bearing parts interprocess and finished parts. The bearing parts with special requirements shall be in accordance with the corresponding standards and product drawings.
2 Normative References
The following documents contain provisions which, through reference in this text, constitute provisions of this standard. At the time of publication, all editions indicated are valid. As all the standards will be revised, each party using this standard shall discuss the feasibility of using the latest edition of the following standards.
Contents Foreword I 1 Scope 2 Normative References 3 Technical Requirements for Bearing Parts 4 Inspection Methods Appendix A (Normative) Test Procedure for Steel Ball Crushing Load and Crushing Load Value Appendix B (Normative) Magnetic Testing Inspection Procedure Appendix C (Normative) Pickling Inspection Procedure Appendix D (Normative) Curve Hardness Correction Value and Hardness Conversion Table Appendix E (Informative) Decarburized Layer Depth of Bearing Parts after Quenching and Tempering Appendix F (Informative) Allowable Deformation Amount of Bearing Ring after Quenching and Tempering Appendix G (Informative) Requirements for Effective Wall Thickness of Ring and Effective Diameter of Roller
1 Scope
This standard specifies the technical requirements for GCr15, GCr15SiMn, GCr15SiMo and GCr18Mo steel rolling bearing parts after annealing, quenching and tempering and the inspection procedure for steel ball crushing load, cold and hot pickling, magnetic testing, etc.
This standard is applicable to heat-treatment quality inspection for above-mentioned steel bearing parts interprocess and finished parts. The bearing parts with special requirements shall be in accordance with the corresponding standards and product drawings.
2 Normative References
The following documents contain provisions which, through reference in this text, constitute provisions of this standard. At the time of publication, all editions indicated are valid. As all the standards will be revised, each party using this standard shall discuss the feasibility of using the latest edition of the following standards.
Contents of JB/T 1255-2001
Contents
Foreword I
1 Scope
2 Normative References
3 Technical Requirements for Bearing Parts
4 Inspection Methods
Appendix A (Normative) Test Procedure for Steel Ball Crushing Load and Crushing Load Value
Appendix B (Normative) Magnetic Testing Inspection Procedure
Appendix C (Normative) Pickling Inspection Procedure
Appendix D (Normative) Curve Hardness Correction Value and Hardness Conversion Table
Appendix E (Informative) Decarburized Layer Depth of Bearing Parts after Quenching and Tempering
Appendix F (Informative) Allowable Deformation Amount of Bearing Ring after Quenching and Tempering
Appendix G (Informative) Requirements for Effective Wall Thickness of Ring and Effective Diameter of Roller
