Hardness conversion (HRC / HV / HB)
HRCHVHBRm (MPa)
20238226770
25266253850
30302286950
353453271,080
403923711,250
454464211,450
484844551,580
505134811,680
52544
55595
58653
60697
63772
65832

Approximate values for un-/low-alloy steel (ISO 18265). Above ~450 HB, Brinell is unreliable; the Rm estimate holds to ~50 HRC.

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