1 hardness (HB)

To a certain load (general 3000kg) to a certain size (diameter) of a certain size (diameter 10mm) of the surface, to maintain a period of time, to load, the ratio of the load and the indentation area, that is, the value of the (HB), the unit is kg force /mm2 (N/mm2).

2 (HR)

When the HB>450 or the sample is too small, the test of the hardness of the specimen can not be used to measure the hardness of the test. It is with a 120 degree angle diamond cone or a diameter of 1.59 3.18mm, the steel ball under load pressure into the measured material surface by the indentation depth and the hardness of the material.

3 Vivtorinox hardness (HV)

To load and angle of 120kg within the diamond square cone of 136 degrees pressing device is pressed into the surface of material, product divided by the load value of surface material of the indentation pit, which is Vivtorinox hardness HV value (kgf/mm2).