... IN SAND,PRECISION/INVESTMETN CASTING OEM SERVICE grey iron casting valve parts,industrial corporation 1.We are manufacturer and ... experiences with casting parts. Material can be reached cast iron,grey iron,ductile iron,steel,carbon steel,stainless steel,copper,brass,bronze ... parts. Vessel parts etc.. 2.Product instruction: • Material:cast iron,GG50,GG40,GGG50,GGG40 etc • Process:sand casting,precision/ ...