1 Scope
This part of GB/T 231 specifies the principle, symbols and abbreviated terms, apparatus, test piece, procedure, uncertainty of the results and test report for the Brinell hardness test for metallic materials.
This part specifies the Brinell hardness test is up to the limit of 650 HBW.
For Brinell hardness test of specific materials or products, shall be specified in particular standards.
2 Normative References
The following normative documents contain provisions which, through reference in this text, constitute provisions of this part of GB/T 231. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this part are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies.
GB/T 231.2 Metallic Materials — Brinell Hardness Test — Part 1: Verification and Calibration of Testing Machines (GB/T 231.2-2002, ISO6506-2:1999, MOD)
GB/T 231.3 Metallic Materials — Brinell Hardness Test —Part 3: Calibration of Reference Blocks (GB/T 231.3-2002, ISO 6506-3:1999, MOD)
GB/T 231.4 Metallic Materials — Brinell Hardness Test — Part 4: Tables of Hardness Values (GB/T 231.4-2009, ISO 6506-4:2005, IDT)
JJF 1059 Evaluation and Expression of Uncertaintv in Measurement
3 Principle
An indenter (hardmetal ball with certain diameter) is forced into the surface of a test piece and, after removal of the force, the diameter of the indentation d left in the surface is measured (see Figure 1).
Foreword
1 Scope
2 Normative References
3 Principle
4 Symbols and Abbreviated Terms
5 Apparatus
6 Test Piece
7 Procedure
8 Uncertainty of the Results
9 Test Report
Appendix A (Informative) Procedure for Periodic Checking of the Testing Machine by the User
Appendix B (Normative) Minimum Thickness of the Test Piece in Relation to the Mean Diameter of Indentation
Appendix C (Informative) Uncertainty of the Measured Hardness Values
