... S REQUIREMENT Material:grey iron,ductile iron,ss,sc,alu. Sand ,precision casting precision casting valve part group 1.We ... with casting parts. Material can be reached cast iron,grey iron,ductile iron,steel,carbon steel,stainless steel,copper,brass,bronze ... Vessel parts etc.. 2.Product instruction: • Material:grey iron,ductile iron,steel casting,stainless steel, • Process:sand casting,precision/ ...