This Part of GB/T 230 specifies the principle, symbols and description, test equipment, test piece, test procedures, uncertainty of results and test report of Rockwell hardness and Rockwell superficial hardness test for metallic materials.
Attention is drawn to the fact that, spherical hard alloy indenters are considered to be the standard type of Rockwell hardness indenters. Steel ball indenters may be used if specified in a product standard or agreement.
Note 1: attention is drawn to the fact that results obtained with two kinds of balls for the hardness test can be different. For specific materials and/or products, other standards apply.
Note 2: for certain materials, the application scope may be narrower than those specified.
Foreword i
1 Scope 1
2 Normative References 1
3 Principle 1
4 Symbols and Description 2
5 Test Equipment 2
5.1 Hardness Tester 2
5.2 Indenter 2
5.3 Measuring System 2
6 Test Piece 2
7 Test Procedures 3
8 Uncertainty of the Results 4
9 Test Report 4
Appendix A (Normative) HR30Tm and HR15Tm Test Specification for Thin Products 6
Appendix B (Normative) Minimum Thickness Relational Graph of the Test Piece in Relation to the Rockwell Hardness 7
Appendix C (Normative) Correction Values of Rockwell Hardness Tested on the Convex Cylindrical Surface 9
Appendix D (Normative) Correction Table of Rockwell Hardness C Scale Tested on the Convex Spherical Surface 12
Appendix E (Informative) Method for Periodic Check of Hardness Tester by the User 13
Appendix F (Informative) Descriptions on Diamond Indenters 14
Appendix G (Informative) Uncertainty Evaluation for the Measured Hardness Values 15
