Technical Production dataInformation 32. Hardness conversion table ■Conversion table from Rockwell C hardness of steel. (Approximate) Brinell Hardness Rockwell Hardness※2 Rockwell Super cial Hardness RockwellC ScaleHardnessVickersHardnessStandard ballTungstenCarbide ballA scaleB scale D scale ShoreHardness15-N scale30-N scale45-N scaleTensileStrengthMPa※1RockwellC ScaleHardness※2 HRC HV HBS HBW HRA HRB HRD HR15N HR30N HR45N HS − HRC ※1 : 1Mpa=1N/mm2 ※2 : In above table, numbers in parenthesis are only for reference. This table is abstracted from SAE J 417. ※Reference (SAE J417) Technical-99