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