MIL-S-6709A, MILITARY SPECIFICATION, STEEL, CHROME-MOLYBDENUM-ALUMINUM; BARS, RODS, BILLETS AND FORGING STOCK (FOR NITRIDING) (AIRCRAFT QUALITY) (24 MAR 1965) [S/S BY SAE-AMS6470 AND SAE-AMS6472]., This specification covers steel of aircraft quality for use in the manufacture of nitrided parts.