Form: This Specification covers an aircraft-quality@ low-alloy steel in the form of bars@ forgings@ flash welded rings@ and stock for forging and flash welded rings. Application: Primarily for parts with section thickness of 0.50 in (12.5 mm) and under in nominal at time of heat treatment requiring a through-hardening steel capable of developing hardness as high as 50 HRC when properly hardened and tempered and also for parts of greater thickness requiring proportionately lower hardness.
SAE AMS6382J-1981 history
1970SAE AMS6382S-2023 Steel, Bars, Forgings, Rings, and Stock for Forging or Flash Welded Rings Aircraft Quality 0.95Cr - 0.20Mo (0.38 - 0.43C) (4140) Annealed