The principle of measuring Brinell hardness is to use a certain test force F(N) (the unit of force is usually kg force kgf, note: 1kgf=9.8N, kgf means one kilogram force), and the diameter is D (mm) The quenched steel ball or the cemented carbide ball is pressed into the surface of the metal to be tested. The test force was removed after a predetermined period of time, and the average diameter d (mm) of the indentation was measured with a reading microscope. Then calculate the Brinell hardness HB value according to the formula, or find the HB value from the prepared Brinell hardness table according to d.
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