HAYNES® 263 alloy is an age-hardenable nickel-cobalt-chromium-molybdenum alloy designed specifically to combine very good aged strength properties with excellent fabrication characteristics in the annealed condition. While its strength at elevated temperature is not quite as high as materials such as Waspaloy alloy or alloy R-41, it is far easier to form or weld than these alloys. Alloy 263 exhibits excellent intermediate temperature tensile ductility, and is not normally subject to strain age cracking problems common for gamma prime strenghened alloys.

Alloy 263 is normally used for applications up to about 1650°F (900°C). Its oxidation resistance is comparable to that for other gamma-prime-strengthened superalloys.