Brinell scale ( using the SI units)
The Brinell scale characterizes the indentation hardness of materials through the scale of penetration of an indenter, loaded on a material test-piece. It is one of several definitions of hardness in materials science.
BHN or Brinell Number is the numerical value assigned to the hardness of metals and alloys. The test is to determine the hardness of a metal by pressing a steel ball of a standard size into the metal using a standard force.
The standard format for specifying tests can be seen in the example “HBW 10/3000”. “HBW” means that a tungsten carbide (from the chemical symbol for tungsten) ball indenter was used, as opposed to “HBS”, which means a hardened steel ball.
|HBW||Brinell hardness (N/mm2)|
|F||applied force (N)|
|D||diameter of indenter (mm)|
|d||diameter of indentation (mm)|