Full definition
Hardness scale based on indentation diameter made by a 10mm tungsten carbide ball under 3000 kgf (ferrous metals) or 500 kgf (soft metals). Symbol: HBW. Approximate conversions: 200 HBW ≈ 20 HRC ≈ 211 HV; 400 HBW ≈ 42 HRC ≈ 423 HV. Suited for castings and forgings where HRC is not applicable. Standard: ASTM E10, ISO 6506.