cast iron auto exhaust pipe castings pipeMaterial:SS304,SS316 Process:Silica solution casting Certificate ... :ISO9001:20 Product Name: cast iron auto exhaust pipe castingsMaterials: grey iron, ductile iron, malleable iron,heat resistant ... , electric furnace, resin-bonded, dry sand mix miller, quake press molding machine, turning molding machine, hanging shot blast cabinet, roller ...