STEEL 0.55 Ni - 0.5 Cr - 0.25Mo (0.38-0.43 C) (SAE 8740)
|Publication Date:||1 December 1950|
FORM: Bars, billets, and forgings.
APPLICATION: Parts with sections 0.375 in. Or less in thickness at the time of heat treatment which require a through-hardening steel capable of developing hardness of Rockwell C50 when properly hardened and tempered and also parts of greater thickness but requiring proportionately lower hardness.