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Based on Vickers hardness

Vickers hardness basisHV 85 to 940 (82 rows)Consult it when the Vickers hardness is known. The step is 5, 10 or 20 depending on the range.Rockwell C hardness basisHRC 0 to 68 (59 rows)Consult it when the Rockwell C hardness is known. The step is 1 HRC, and 2 below 20.

Values converted from Vickers hardness of steel

Vickers hardness
HV		Brinell hardness HB
10 mm ball, 3000 kgf test force		Rockwell hardness HRRockwell superficial hardness
Diamond cone indenter		Shore hardness
HS		Tensile strength (approximate)
Standard ballHultgren ballTungsten carbide ballScale A HRAScale B HRBScale C HRCScale D HRD15-N30-N45-NMPakgf/mm2

Notes

  • References
    • ASTM E140 (paid standard; the source has not been checked)
    • JIS Z 8438 (used for converting tensile strength to kgf/mm²)
Hardness conversion — Based on Vickers hardness | Updraft - Mechanical Engineering Calculators