MIL-S-7393C
MIL-S-7393C, MILITARY SPECIFICATION: STEEL ALLOY CARBURIZING, BARS AND BILLETS, STEEL NICKEL-CHROMIUM (3310, 3316 AND 9310), AIRCRAFT QUALITY (28 AUG 1968)., This specification covers air melted nickel-chromium - molybdenum steels intended for use in carburized aircraft parts
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