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The Rockwell hardness test is the most used and versatile of the hardness tests. For soft materials such as copper alloys, soft steel, and aluminum alloys a 1/16 diameter steel ball is used with a 100-kilogram load and the hardness is read on the B scale.
A 4.6.1. with the exception of heatâtreated wire of diameter .100 (2.54 mm) and larger, the Rockwell Hardness Test is not recommended for round wire. On such heatâtreated wire the specimen shall be flatten on two parallel sides by grinding.