SAE AMS 6308F:2018-05-16

Steel, Bars and Forgings 0.90Si - 1.0Cr - 2.0Ni - 3.2Mo - 2.0Cu - 0.10V (0.07 - 0.13C) Vacuum Arc or Electroslag Remelted

This specification covers a premium aircraft-quality, low-alloy steel in the form of bars, forgings, and forging stock.