Metallic materials - Brinell hardness test - Part 2: Verification and calibration of hardness testing machines (ISO 6506-2:1999); German version EN ISO 6506-2:1999— 7 стр.
Metallic materials - Rockwell hardness test (scales A, B, C, D, E, F, G, H, K, N, T) - Part 2: Verification and calibration of testing machines (ISO 6508-2:1999); German version EN ISO 6508-2:1999— 12 стр.
Metallic materials - Rockwell hardness test (scales A, B, C, D, E, F, G, H, K, N, T) - Part 3: Calibration of reference blocks (ISO 6508-3:1999); German version EN ISO 6508-3:1999— 9 стр.