MIL-S-8949, MILITARY SPECIFICATION (ASG), STEEL BARS, PLATES, SHEETS, BILLETS, AND REFORGING STOCK TYPE D6AC (10 MAY 1965) [S/S BY SAE-AMS-S-8949]., This specification establishes the requirements for procuring vacuum melted Cr-Mo-V-Ni, type D6AC steel forged billets, reforging stock, bars, rods, plate, sheet, and strip