Steel Bars and Forgings 0.25Mo (0.35 - 0.40C) (SAE 4037)
|Publication Date:||15 November 1971|
Form: This specification covers an aircraft-quality, low-alloy steel in the form of bars, forgings, and forging stock.
Application: Primarily for parts with sections 0.375 in. (9.525 mm) or less in thickness at the time of heat treatment which require a through hardening steel capable of developing hardness of approximately 40 IIRC when properly hardened and tempered and also parts with thinner sections which require proportionately higher hardness.