casting stainless steel valve ball ISO9001:2000 Approved Process:precision casting Standard:JIS,DIN,ASTM,BS OEM service casting stainless steel valve ballWe ... .OEM service available 3.Materials: stainless steel,cast iron,pig iron,carbon steel,alloy steel,non-ferrous,grey iron,ductile cast iron ... ,polishing,machining,machining center,plating,HeatTreatment,ect. casting stainless steel valve ball