ATI Allegheny Ludlum Altemp® 718 Nickel-Base Superalloy, Solution Treated plus Precipitation Heat Treated, UNS N07718

Allegheny Ludlum Altemp 718 alloy is an austenitic nickel-base superalloy which is used in applications requiring high strength to approximately 760 degrees Celsius and oxidation resistance to approximately 982 degrees Celsius. 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 718 degrees Celsius with cooling and a hold at 621°C.The relatively slow response to precipitation hardening permits repair welding of the Altemp 718 alloy even in the aged condition. The Altemp 718 alloy is usually produced by a double melt practice using consumable electrode remelt procedures to provide homogeneity and extremely clean structures. Uses include aircraft ducting and engine plumbing.Tensile properties below are from AMS 5596 and/or AMS 5597.Information provided by Allegheny Ludlum