... ISO9001:20 Product Name: cast iron auto exhaust pipe castingsMaterials: grey iron, ductile iron, malleable iron,heat resistant iron, carbon steel, stainless steel ... injection, CNC-machine, machine-center, Heat treatment Furnace 1) We can do different kinds of surface treatment ... service.6. Manufacturing equipment (foundry used): cupola, electric furnace, resin-bonded, dry sand mix miller, quake press ...