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Hardness Testing Equipment
Engineering Metals and Materials Table of Contents
The Rockwell hardness test is the most common method for
determining hardness of ferrous and many nonferrous metals. (See table below.)
It differs from Brinell hardness testing in that the hardness is determined by
the depth of indentation made by a constant load impressing on an indenter. In
this test, a standard minor load is applied to set a hardened steel ball or a
diamond cone in the surface of the metal, followed by the application of a
standard major load. The hardness is measured by depth of penetration. Rockwell
superficial hardness tests are made using light minor and major loads and a more
sensitive system for measuring depth of indentation. It is useful for thin
sections, very small parts, etc. Calibration of Rockwell hardness testers is
done in accordance with American Society of Testing Materials (ASTM E-18)
specifications.
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