GB/T 38751-2020 in English
VALIDGeneral rules of hardness test for heat treated parts
- Issued on:2020-04-28
- Implemented on:2020-11-01
- File Format:PDF
- Delivery:Within 1 day
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《GB/T 38751-2020热处理件硬度检验通则》由TC75（全国热处理标准化技术委员会）归口，主管部门为国家标准化管理委员会。
Introduction
Analysis of the core content of the standard
| Test method | Scope of application | Typical materials | Minimum thickness requirement |
|---|---|---|---|
| Rockwell hardness(GB/T230.1) | Quenched and tempered parts (HRC), thin parts (HRA) | Alloy steel, tool steel | 0.8mm(HRC) |
| Brinell hardness(GB/T231.1) | Annealed/normalized parts (≤450HBW) | Carbon structural steel | 1.5×indentation depth |
| Vickers hardness(GB/T4340.1) | Hardened layer/microstructure | Nitrided parts, thin plates | 0.04mm(HV0.1) |
Key implementation points
Hardness tester management specifications
Standard requirements for hardness testers must:
- Verify with a standard block before daily use, and the error shall not exceed the value specified in GB/T230.2
- Indenter surface roughness Ra≤0.1μm
- Verification period ≤12 months
Surface correction technology
For specimens with a radius of curvature of less than 20mm, correction is required according to Appendix C:
- Correction coefficient for cylindrical Vickers hardness can reach 0.85-1.15
- Maximum correction value for spherical Rockwell hardness is 3HRC
Analysis of standard evolution
Innovations of this standard:
- Uniform use of carbide balls to replace steel ball Brinell indenters
- New standardized application of Leeb hardness (GB/T17394)
- Clear limitations of conversion between hardness value and tensile strength
Sample only — not a preview of GB/T 38751-2020
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