... , ductile iron specifiedStandardASTM , AISI , BS , DIN , JIS , NFProcessInvestment casting , die casting , gravity casting , sand castingMachiningTurning , milling , drilling , grinding , threading , CNC machining, ... , acid treatment , anodizing , painting and PVC powder coatingInspectionCoordinate measuring machine, optical comparator , surface indicator, chemical element analysis, hardness testing, ...