SAE AMS 5940E
Alloy, Corrosion- and Heat-Resistant, Bars, Forgings, and Rings and Stock for Forging, Flash-Welded Rings and Heading, 34Co - 3.0Cr - 28Ni - 3.0Cb(Nb) - 5.5Al - 0.008B - 25.5Fe Multiple Melted, High Temperature, Oxidation-Resistant, Low Expansion, Solution Heat Treated, Precipitation-Hardenable (Alloy 783)