MIL-S-8840B, MILITARY SPECIFICATION, STEEL SHEET AND STRIP, CORROSION-RESISTANT, PRECIPITATION HARDENING (AM350 AND AM355), PREMIUM QUALITY (05 OCT 1965) [S/S BY SAE-AMS-S-8840]., This specification covers corrosion resistant, heat treatable steel in sheet and strip form (see 6.3) of the compositions and conditions indicated.