The Rockwell hardness test method, as properly defined in ASTM E-18 standards, is the most commonly used hardness test method among all the other methods. All metals can be tested using the Rockwell method, with the exception of those where too many changes would result from the test sample structure or surface characteristics, where the indentations might be too large, or where the sample size or shape might preclude its application.

The permanent depth of the indentation caused by a force or load on an indenter is measured using the Rockwell hardness testing method. With the use of a diamond or ball indenter, a preliminary test force (preload or small load) is first given to the sample. In order to lessen the impacts of surface polish, this preload penetrates the surface. It is feasible to determine the baseline depth of indentation by holding this first test force for a predetermined dwell duration.

The following Rockwell Test Force test force can be applied in Universal Hardness Tester for Vickers / Knoop, Rockwell and Brinell: 60kgf(588N), 100kgf(980N), 150kgf(1471N);

Initial test force:10kgf(98N).

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