HB (Tungsten 3000) 411 Brinell 10 mm Tungsten 3000 kgf 80~620 HB (Indentation) 3.03 mm Brinell Indentation 6~2 HK 455 Knoop 97~920 HM 4 Mohs 1~10 HRA 73 Rockwell A-Scale 59~86 HRB >> Rockwell B-Scale 41~100 HRC 44 Rockwell C-Scale 19~69 HRD 58 Rockwell D-Scale 39...
The Rockwell Hardness Test presses a steel or diamond hemisphere-conical penetrator against a test specimen and measures the resulting indentation depth as a gage of the specimen hardness. The harder the material, the higher the HR reading. In the test, a minor load (10 kgf) is first applie...