32. Hardness conversion table ■Conversion table from Rockwell C hardness of steel. (Approximate) Production data Brinell Hardness Rockwell Hardness※2 Rockwell Superficial Hardness Rockwell Rockwell Vickers Shore Tensile C Scale C Scale Hardness Hardness Strength Hardness Tungsten Hardness※2 Standard ball A scale B scale D scale 15-N scale 30-N scale 45-N scale MPa※1 Carbide ball HRC HV HBS HBW HRA HRB HRD HR15N HR30N HR45N HS − HRC Information Technical ※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