GB/T 231.1-2009 in English

《GB/T 231.1-2009金属材料 布氏硬度试验 第1部分：试验方法》由TC183（全国钢标准化技术委员会）归口，TC183SC4（全国钢标准化技术委员会力学及工艺性能试验方法分会）执行，主管部门为中国钢铁工业协会。
GB/T231的本部分规定了金属布氏硬度试验的原理、符号及说明、试验设备、试样、试验程序、结果的不确定度及试验报告。
本部分规定的布氏硬度试验范围上限为650HBW。
特殊材料或产品布氏硬度试验,应在相关标准中规定。

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