The Brinell hardness test
DIN EN ISO 6506
In addition to these two fundamental tests, certain types of grey cast iron are also tested to determine their hardness in relation to the material thickness. Typically, hardness testing is done according to Brinell, who determined hardness as the mechanical resistance of a material to penetration by an indenting tool (see DIN EN ISO 6506).
During the Brinell hardness test, a hard metal ball is pressed into the surface of the test object with a defined test force F to create an indentation; the size of the indentation can then be used to calculate the material’s hardness. The testing balls can have diameters of 10 mm, 5 mm, 2.5 mm, or 1 mm; particularly when dealing with cast irons, it is advisable to use indenter.