Brinell hardness - √دنیـــــــای متـــــــــــالورژی فقـــــــط از ایـــــــنجا
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تاريخ : سه‌شنبه ٩ فروردین ۱۳۸٤


Description

The 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 Scales

Hardness scaleBall diameter,
D (mm)
Nominal force,
F (N)
HBW 10/30001029420
HBW 10/15001014710
HBW 10/1000109807
HBW 10/500104903
HBW 10/250102452
HBW 10/10010980.7
HBW 5/75057355
HBW 5/25052452
HBW 5/12551226
HBW 5/62.55612.9
HBW 5/255245.2
HBW 2.5/187.52.51839
HBW 2.5/62.52.5612.9
HBW 2.5/31.252.5306.5
HBW 2.5/15.6252.5153.2
HBW 2.5/6.252.561.29
HBW 1/301294.2
HBW 1/10198.07
HBW 1/5149.03
HBW 1/2.5124.52
HBW 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.

Standards

BS EN ISO 6506-1:1999,
(BS 240:Part 1:1962)
Metallic materials. Brinell hardness test. Test method
E10-01Standard Test Method for Brinell Hardness of Metallic Materials

                                                              



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