Abstract: The process for making a forged nickel-base superalloy part for use in the 700-900.degree. C. range which includes the steps of:a) providing a nickel-base superalloy having the following composition:______________________________________ percentage by weight ______________________________________ Cr 15.5-18 Co 14.0-15.5 Mo 2.75-3.25 W 1.00-1.50 Ti 4.75-5.25 Al 2.25-2.75 Zr 0.025-0.050 B 0.01-0.02 C 0.006-0.025 Cu .ltoreq.0.10 Mn .ltoreq.0.15 Fe .ltoreq.0.50 Si .ltoreq.0.2 P .ltoreq.0.05 S .ltoreq.0.05 Ni balance ______________________________________and eventual impurities, where the weight ration B/C is equal to or greater than 1.1;b) forging said nickel-base superalloy to obtain an as-forged part;c) submitting the as-forged part of step b) to a solution heat treatment at a temperature ranging from 10 to 30.degree. C. above the .gamma.' phase solvus temperature;d) quenching the solution heat treated forged part resulting from step c) at a quenching rate above 100.degree. C.