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Hardness conversion

Conversion of hardness-to-hardness or hardness-to-tensile-strength values for unalloyed and low-alloy steels and cast iron.

Based on ISO 18265-2003 

Valid range
Tensile strength N/mm² 255 - 2180
Vickers hardness HV10 80 - 940
Brinell hardness HB 76 - 618
Rockwell hardness HRB 41 - 105
Rockwell hardness HRF 82.6 - 115.1
Rockwell hardness HRC 20.3 - 68
Rockwell hardness HRA 60.7 - 85.6
Rockwell hardness HRD 40.3 - 76.9
Rockwell hardness HR15N 69.6 - 93.2
Rockwell hardness HR30N 41.7 - 84.4
Rockwell hardness HR45N 19.9 - 75.4


This application is based on ISO 18265-2003:
Metallic materials, conversion of hardness values.



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