... cast steel gate valve ISO9001:2000 Approved Process:precision casting Standard:JIS,DIN,ASTM,BS OEM service available cast steel gate valveWe ... Materials: stainless steel,cast iron,pig iron,carbon steel,alloy steel,non-ferrous,grey iron,ductile cast iron and so on 4. ... center,plating,HeatTreatment,ect. description materialstainless steel, cast iron, pig iron, carbon steel, alloy steel, non-ferrous, grey ...