... JIS, NF 3.100%QC 4.ISO9001Detail Feature:sand casting cast ironMaterials: grey iron, ductile iron, malleable iron, ... We make them by precision casting, investment casting and steel sand casting process in Ningbo, China ( Valve Casting / Casting valve / ball Valves) 3 ... supply carbon steel, stainless steel and alloy steel precision casting part. and supply chasing ,heat treatment,machining service.6. ...