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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.
Of these, indentation hardness itself leads to many operational definitions, the most important of which are: 1  Brinell hardness test â using a 10 mm steel ball; 2  Vickers hardness test â using a pyramidal diamond indenter; and. 3  Rockwell hardness test â using a diamond cone indenter.