STEEL BARS, FORGINGS, AND RINGS 0.50Cr - 0.55Ni - 0.25Mo (0.038 - 0.43C) (SAE 8740)
|Publication Date:||16 July 1979|
Form: This specification covers an aircraft-quality, low-alloy steel in the form of bars, forgings, flash welded rings, and stock for forging or flash welded rings.
Application: Primarily for parts with sections thickness of 0.375 in. (9.52 mm) and under at the 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 parts of greater thickness but requiring proportionately lower hardness.