Hardness HRC

The hardness of a metal is a mechanical property of a certain material that expresses the resistance against the penetration of a test body into the surface of the test specimen. The values are given either in the unit MPa, or without units, depending on the testing methods according to Brinell, Rockwell, or Vickers.

As for the Rockwell hardness test, it is a static test of material hardness. It is addressed and standardized by our standard ČSN EN ISO 6508-1. The principle of the test is very simple – the indenter (test body) penetrates another material after a specific load is applied, and based on the depth of the indentation, the hardness of the given metal is determined.

The loading of the material is carried out in preliminary and total forms. The difference is that the preliminary serves to completely minimize the potential elasticity influence of the material on the test.

For the marking and execution of Rockwell tests according to the type, a diamond cone is also used as an indenter for HRC, which is the case for HRA, but unlike the HRA test, not just a force of 588 N is used, but a significantly higher force of 1471 N.

 Source: https://upload.wikimedia.org/wikipedia/commons/3/35/Tvrdosti_C.png