text: what is the common metal name for cd4m?   this is cast stainless alloy., it is widely used in pumps, valves, and fittings. all corrosion resistant alloys have theletter c plus a second letter (a to n) denoting increasing nickel content. numerals indicate maximum carbon. typical members of this group are cf-8, similar to 304 stainless; cf- 8m, similar to 316; cf3m, similar to 316l and cd4m cu, which has improved resistance to nitric, sulfuric, and phosphoric acids