BHN - Brinell Hardness Number

The Brinell hardness test of  metals and alloys

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The Brinell hardness test is commonly used to determine the hardness of materials like metals and alloys.

The test is achieved by applying a known load to the surface of the tested material through a hardened steel ball of known diameter. The diameter of the resulting permanent impression in the tested metal is measured and the Brinell Hardness Number is calculated as

BHN = 2 P / [π D / (D - (D2 - d2)1/2 )] (1)

where

BHN = Brinell Hardness Number

P = load on the indenting tool (kg)

D = diameter of steel ball (mm)

d = measure diameter at the rim of the impression (mm)

It is desirable that the test load are limited to a impression diameter in the range of 2.5 to 4.75 mm.

Approximate loads and Brinell Hardness Numbers:

Brinell Hardness Number Load (kg)
160 - 600 3000
80 - 300 1500
26 - 100 500

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Related Topics

  • Material Properties Material properties - density, heat capacity, viscosity and more - for gases, fluids and solids

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