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FLAME METALLURGICAL, INC. | |
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The Brinell hardness number is calculated by dividing the applied load by the surface area of the indentation according to the following formula:
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| Input Ball Diameter (mm) D = | |
| Input Impression Diameter (mm) d = | |
| Brinell Number HB = |
| The Brinell hardness number followed by the symbol HB denotes standard test conditions of 3000 kg, 10mm ball and 10-15 seconds loading.
Other testing conditions are suffixed as 'ball/kgs/load duration(secs)' after the number obtained and HB symbol (ie. 50.3 HB 10/500/30) for 10mm ball, 500 kg, 30 seconds load and an impression reading of 3.50mm.
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