... :ISO9001:20 Product Name: cast iron auto exhaust pipe castingsMaterials: grey iron, ductile iron, malleable iron,heat resistant iron, carbon steel, stainless steel, ... Manufacturing equipment (foundry used): cupola, electric furnace, resin-bonded, dry sand mix miller, quake press molding machine, turning molding machine ... , multiple use angle mearuring tool, CMM etc. cast iron auto exhaust pipe castings