This specification covers a premium aircraft-quality, low-alloy steel in the form of bars and forgings 25 square inches (161 cm2) and under, and forging stock of any size.
SAE AMS6408F-2023 history
2023SAE AMS6408F-2023 Steel, Hotwork Tool, Bars, and Forgings and Forging Stock 5.25Cr - 1.5Mo - 1.0V (0.35-0.45C) (H-13) Electroslag Remelted (ESR) or Consumable Electrode Vacuum Arc Remelted (VAR) Annealed