NS-EN ISO 6508-2:2005 金属材料洛氏硬度测试 第2部分:试验机的验证和校准(标尺A、B、C、D、E、F、G、H、K、N、T)(ISO 6508-2:2005)
Metallic materials - Rockwell hardness test - Part 2: Verification and calibration of testing machines (scales A, B, C, D, E, F, G, H, K, N, T) (ISO 6508-2:2005)