GB/T 230.2-2022金属材料洛氏硬度试验第2部分:硬度计及压头的检验与校准国家标准
英文:Metallic materials—Rockwell hardness test—Part 2: Verification and calibration of testing machines and indenters GB/T...
英文:Metallic materials—Rockwell hardness test—Part 2: Verification and calibration of testing machines and indenters GB/T...