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: Death of manufacturing greatly exaggerated; entire city to be built on stilts - by Vicki Bell Highlights for fabricators from the past week’s Web articles — Ohio politician says death of manufacturing greatly exaggerated; an entire city to be built on stilts; working women to outnumber men in Canada, but not in trades; metal shaper builds iconic cars; and another builds rat rods.
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