DescriptionThe Brinell hardness test uses a ball indenter of diameter, D, which is pressed into the surface of the test piece using a prescribed force, F. The time for the initial application of the force is 2 s to 8 s, and the test force is maintained for 10 s to 15 s. The diameter of the indentation, d, is measured after the force has been removed. The Brinell hardness number, HB, is given by:
HB = Constant × F / Surface area of indentation
Standard Brinell ScalesHardness scaleBall diameter,
D (mm)Nominal force,
F (N)HBW 10/30001029420HBW 10/15001014710HBW 10/1000109807HBW 10/500104903HBW 10/250102452HBW 10/10010980.7HBW 5/75057355HBW 5/25052452HBW 5/12551226HBW 5/62.55612.9HBW 5/255245.2HBW 2.5/187.52.51839HBW 2.5/62.52.5612.9HBW 2.5/31.252.5306.5HBW 2.5/15.6252.5153.2HBW 2.5/6.252.561.29HBW 1/301294.2HBW 1/10198.07HBW 1/5149.03HBW 1/2.5124.52HBW 1/119.807/>
The designation "HBW" specifies the use of a tungsten carbide ball indenter.
The designation "HBS" specifies the use of a hardened steel ball indenter but is now deleted from standards.
It should be noted that measurements of HBW and HBS on the same sample may differ in value due to differences in the tribological characteristics of the indenter-specimen interface.
StandardsBS EN ISO 6506-1:1999,
(BS 240:Part 1:1962)Metallic materials. Brinell hardness test. Test methodE10-01Standard Test Method for Brinell Hardness of Metallic Materials