ductile iron casting with 100%pressure test, certified by ISO, TUV-PED, BV ... welding, dipping, sand-coating, shell-making, dewaxing, cleaning, pouring, cutting.2, Materials: carbon steel, alloy steel, cast iron, cast steel, pig iron, grey iron, ductile cast iron and so ... of machining equipment, including 4 CNC machining centers. pressure investment casting, ductile iron