Production process of our valve seat ring . Application : According to supplied drawing and metal compositions, many kinds of parts can be made by investment casting and powder metallurgy methods, such as valve seat insert, forging mould, valve cage and Cobalt Chrome Alloy series 3, 4, 6, 12, 21, 23, 25, 27, 30, 31, 36, as well as Co# 400, Umco …