32. Hardness conversion table Production data ■Conversion table from Rockwell C hardness of steel. (Approximate) Brinell Hardness Rockwell Hardness 2 Rockwell Superficial Hardness Rockwell Vickers Shore Tensile Rockwell C Scale Hardness Hardness Strength C Scale 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 HB HRA HRB HRD HS15N HS30N HS45N HS - HRC Technical Information 1 : 1Mpa=1N/mm2 2 : In above table, numbers in parenthesis are only for reference. This table is abstracted from SAE J 417. Technical-89 860