casting stainless steel valve ball ISO9001:2000 Approved Process:precision casting Standard:JIS,DIN,ASTM, ... process, soluble glass process , silicon process casting5.Weight range: 0.02 to 30kg 6.Application: Industrial parts, Machinery parts, hardware, construction ... ,machining,machining center,plating,HeatTreatment,ect. casting stainless steel valve ball