... Stainless steel parts: 302, 304, 316 etc.1) Sand casting parts material: Gray iron, ductile iron, malleable iron, ... aluminum, bronze, zinc brass. Prisission casting parts: Middle carbon steel, stainless steel . Bronze.Forged: friction ... sand equipment, dry sand mix millaer, quake press molding machine.4) Inspection equipment: elongation teser, hardness tester, metallographic ...