12681-83-3 AMS 5656C ASTM XM10 Alloy 21-6-9 Armco 21-6-9 Iron alloy, base, Fe 60-69, Cr 18-21, Mn 8-10, Ni 5-7, Si 0-1, N 0.2-0.4, C 0-0.1, P 0-0.1 Nickel containing steels Nickel containing steels [Nickel and nickel compounds] Nitronic 40 Nitronic 40 stainless steel Pyromet 538 Stainless steel 21-6-9 Steel 21-6-9