A common hardness test done with a round, very hard steel ball which is pressed into the material being tested. The diameter of the mark left in the steel is measured and a table is used to convert this to a Brinell Hardness Number. The higher the number, the harder the steel. See hardness testing.
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From the Web: ‘Routine’ jobs disappearing; business expands; 3-D printing updates; and brake woes - by Vicki Bell Web articles for fabricators—The future of routine jobs; Lincoln, Neb., business expands; 3-D developments; and brake concerns.
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