Form This specification covers a premium aircraft-quality@ low-alloy steel in the form of bars@ forgings@ and forging stock. Application These products have been used typically for hotwork tooling or for parts requiring a steel capable of through-hardening to a minimum hardness of 50 HRC in section thicknesses up to 12 inches (305 mm) with relatively high levels of strength@ fatigue resistance@ ductility@ and thermal stability for use in service from -100 to +1000 ??(-73 to +538 ?? and where such parts may require welding@ but usage is not limited to such applications. Certain design and processing procedures may cause these products to become susceptible to stress-corrosion cracking after heat treatment. ARP1110 recommends practices to minimize such conditions.
SAE AMS6408E-2018 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