HB (Indentation) 5.36 mm Brinell Indentation 6~2 HK 141 Knoop 97~920 HM 2.5 Mohs 1~10 HRA << Rockwell A-Scale 59~86 HRC << Rockwell C-Scale 19~69 HRD << Rockwell D-Scale 39~77 HRF 97 Rockwell F-Scale 88~100 HR-15N << Rockwell Superficial 15N 69~94 HR-15T 84 ...
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...
The Knoop Hardness Test, using an elongated pyramidal indenter, is a micro-indentation method suitable for thin plastic sheets, thin metal sheets, brittle materials, or materials where the applied load must never exceed 3.6 kgf. In the Knoop Hardness Test, a load (typically in the range of ...