... hard to quench a hard steel, shallow carburization, nitriding steel to soft copper, brass, stainless steel, cold rolled steel plate, aluminum plate and so on. The ... , aluminum, magnesium alloy, bearing alloys.1/8 steel ballE100BAnnealed brass, copper, aluminum, mild steel sheet.1/16 steel ballF60BBronze, phosphor bronze, malleable iron, etc ...