1, the Brunel hardness (HB)

A certain load (usually 3000kg) to a certain size (diameter typically 10mm) hardened steel ball pressed into the surface, a period of time to load, the load area with the ratio of indentation, is the Brunel hardness value (HB), in units of kg / mm2 (N/mm2).

2, Rockwell hardness (HR)

When HB> 450 or the sample is too small, can not be used to switch Brunel hardness test Rock well hardness measurement. It is 120 ° angle with a diamond cone or steel ball 1.59,3.18 mm in diameter, to a certain load onto the surface of the test material, obtained by the depth of he indentation hardness of the material. According to the different hardness tests, in three different scales to represent:

HRA: 60kg load is the use of diamond cone pressed into the device and the hardness obtained for the high hardness of the material (eg, carbide, etc.).

HRB: 100kg load and is the use of hardened steel ball diameter of 1.58mm, the hardness obtained for the lower hardness of the material (such as annealed steel, cast iron, etc.).

HRC: 150kg load is the use of diamond cone pressed into the device and the hardness obtained for the high hardness of the material (such as hardened steel, etc.).

3, Vickers hardness (HV)

To less than 120kg load and angle of 136 ° diamond cone pressed into a square device pressed into the surface, the surface area of ??pit material indentation load divided by the value, that is, the Vickers hardness (HV).



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