Patent ID: 8512488

Claim:
An Ni—Fe based forging superalloy comprising 30 to 40 wt % of Fe, 14 to 16 wt % of Cr, 1.2 to 1.7 wt % of Ti, 1.1 to 1.5 wt % of Al, 1.9 to 2.2 wt % of Nb, 0.05 wt % or less of C, and the remainder of Ni and inevitable impurities, wherein γ′ phase (Ni 3 Al) precipitate having an initial mean particle size of 50 to 100 nm is enhanced in the grain, wherein said Ni—Fe based superalloy forging material has a 0.2% yield strength of 450 to 600 MPa at 700° C. and reduction of area of 25% or greater, and wherein the C is bonded with Nb and Ti to form MC carbide.