Alloy 718 (N07718) is a high strength nickel-base alloy initially developed for the aerospace industry and is used in applications requiring high strength to approximately 1400°F (760°C) and oxidation resistance to approximately 1800°F (982°C).
In addition, the alloy exhibits excellent tensile and impact strength even at cryogenic temperatures. High strength at room and elevated temperatures is developed by a precipitation heat treatment at 1325°F (718°C) with cooling and a hold of 1150°F (621°C).
The relatively slow response to precipitation hardening permits repair welding of Alloy 718, even in the aged condition. Its excellent strength and corrosion resistance have been recognised by the oil industry and it is now widely used in this field.