DIN EN ISO 6508-3:2006 金属材料.洛氏硬度试验.第3部分:基准块的校准(A、B、C、D、E、F、G、H、K、N、T刻度)
Metallic materials - Rockwell hardness test - Part 3: Calibration of reference blocks (scales A, B, C, D, E, F, G, H, K, N, T) (ISO 6508-3:2005); English version of DIN EN ISO 6508-3:2006-03