... nitriding of various steel products, testing of copper alloy, aluminum, carbide and other metal materials. Rockwell Hardness ... pearlitic malleable iron.Diamond indenterD100CCast iron, aluminum, magnesium alloy, bearing alloys.1/8 steel ballE100BAnnealed brass, ... —TDiamond indenter45N45N—TMild steel, stainless steel, copper alloy, aluminum alloy thin strips, thin-walled tubes, small parts, ...