Patent ID: 7416618

Claim:
A high strength corrosion resistant alloy consisting essentially of in percent by weight: 35-55% Ni, 12-25% Cr, 0.5-5% Mo, 0.2-3.0% Cu, 2.2-4.5% Nb, 0.5-3% Ti, up to 0.7% Al, 0.005-0.04% C, 16-35% Fe plus incidental impurities and deoxidizers and wherein the alloy satisfies the equation: ( Nb - 7.75 ⁢ C ) ( Al + Ti ) = 0.5 ⁢ ⁢ to ⁢ ⁢ 9 , the alloy containing a mixture of γ′ and γ″ phases with a minimum of 1% by weight γ″ and having a minimum yield strength of 120 ksi when in an annealed, water quenched and aged condition.