Nickel-chromium high strength casting

A cast nickel-chromium alloy characterized by a good combination of stress-rupture strength at temperatures of 850.degree. C. or higher together with marked resistance to embrittlement upon prolonged exposure to such temperature, and also good weldability, said alloy consisting of from 27 to 31% chromium, 10 to 25% cobalt, up to 1.9% niobium, titanium and aluminum in a total amount of 3.5 to 5.5%, the ratio of titanium to aluminum being from 1:1 to 4:1 and with the niobium, titanium, aluminum and chromium being correlated such that the "Correlated Factor" of 5 (% Nb) + 6 (% Ti + Al) + 2/3 (% Cr) is more than 49 and up to 54, 0.02 to 0.2% carbon, up to 0.025% zirconium, up to 1.2% hafnium with the %Zr + 1/2 (% Hf) not exceeding 0.6%, up to 0.002% boron, up to 0.2% of yttrium and/or lanthanum, the balance being essentially nickel.--