Full Description This specification has been declared CANCELLED by the Aerospace Materials Division, SAE, as of December, 2007. By this action, this document will remain listed in the Numerical Section of the Index of Aerospace Material Specifications indicating that it has been CANCELLED. Cancelled specifications are available from SAE. Similar but not necessarily identical products are covered in the following specifications. However, this listing is provided for information only and does not constitute authority to substitute these specifications for the CANCELLED specification.Bars, forgings, and tubing SAE AMS 6431, Steel, Bars, Forgings, and Tubing,1.05Cr 0.55Ni 1.0Mo 0.11V (0.45-0.50C), Vacuum Consumable Electrode RemeltedSheet, strip, and plate SAE AMS 6439, Steel, Sheet, Strip, and Plate, 1.05Cr 0.55Ni 1.0Mo 0.12V (0.42-0.48C), Consumable Electrode Vacuum Melted AnnealedThis 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.