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Hardness Conversion: HRB
70 to 79
Hardness conversion table — Rockwell B, Rockwell C, Brinell, and Vickers equivalents per ASTM E140 and ASTM A370
| scale | hardness value | hb (dimensionless) | hrb (dimensionless) | hv (dimensionless) | material class |
|---|---|---|---|---|---|
| HRB | 70 | 120 | 70 | 120 | steel |
| HRB | 71 | 122 | 71 | 122 | steel |
| HRB | 72 | 124 | 72 | 124 | steel |
| HRB | 73 | 126 | 73 | 126 | steel |
| HRB | 74 | 128 | 74 | 128 | steel |
| HRB | 75 | 131 | 75 | 131 | steel |
| HRB | 76 | 134 | 76 | 134 | steel |
| HRB | 77 | 137 | 77 | 137 | steel |
| HRB | 78 | 140 | 78 | 140 | steel |
| HRB | 79 | 143 | 79 | 143 | steel |
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