... steel casting. 2.material AISI 304. 3.spare part for valve, threaded, machining. Stainless steel casting,material AISI 304,spare part ... for valve,threaded, machiningWeight: 0.1 - 500kgAccuracy: class CT4 CT7,surface roughness ... ability Special heat treatment: anneal, quenching, normalizing, carburizing. SS casting valve cover