ATI 718 alloy (UNS N07718) is an extremely versatile precipitation-hardening, Ni-base alloy with excellent strength and good ductility up to 1300° F (704° C). These characteristics, combined with good weldability, good formability, and excellent cryogenic properties account for the popularity of this alloy. The main hardening constituent is a niobium containing ?'', Ni3 (Nb, Al, Ti). The unique welding characteristics of this alloy are attributed to the kinetics of the precipitation reaction. It is produced by vacuum induction melting followed by consumable remelting (vacuum arc or electroslag).

Typical applications are high strength components for jet engines made from forgings, castings, and bar stock; welded and fabricated sheet-metal parts; fasteners; miscellaneous hardware, tooling; and liquid rocket components involving cryogenic temperatures.