Rockwell number

Metall.
a numerical expression of the hardness of a metal as determined by a test (Rockwell test) made by indenting a test piece with a Brale, or with a steel ball of specific diameter, under two successive loads and measuring the resulting permanent indentation.
[1930-35, Amer.; named after Stanley P. Rockwell, 20th-century American metallurgist]

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Universalium. 2010.

Look at other dictionaries:

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