This standard specifies the requirements for steel investment castings with a composition of 0.50Cr, 0.55Ni, and 0.20Mo, containing carbon levels between 0.25 and 0.35 (SAE 8630 Mod). It outlines the normalization and tempering processes necessary to achieve specified mechanical properties for these castings.
*** Please note: This description may not be accurate, please refer to the official documentation.