Brinell Hardness Calculator

The principle of Brinell Hardness measurement is to use a certain test force F (N) (the unit of force is usually kilogram force kgf, note: 1kgf=9.8N, kgf means one kilogram of force), press a hardened steel ball or carbide ball with a diameter of D (mm) into the surface of the metal to be tested, keep it for a specified time, remove the test force, measure the average diameter of the indentation d (mm) with a reading microscope, and then calculate the Brinell hardness HB value according to the formula, or find the HB value from the prepared Brinell hardness table based on d.

Formula:

BHN = (2*P) / [ (pi*D)(D - sqrt(D²-d²)) ]