Haynes 718 alloy is a precipitation-hardening nickel-chromium alloy that offers high strength, toughness, and resistance to corrosion and high-temperature environments. It was developed in the 1950s for use in gas turbine engine components, and has since found a wide range of applications in other high-stress industries such as aerospace, nuclear, and chemical processing.
The alloy is characterized by its excellent mechanical properties, including high tensile and yield strength, good ductility and toughness, and resistance to fatigue, creep, and stress-corrosion cracking. These properties are achieved through a combination of precipitation hardening and solid-solution strengthening, which involve heat treatment processes that cause the formation of fine, uniform precipitates within the metal matrix.
Haynes 718 alloy also has good resistance to oxidation and other forms of corrosion, particularly in high-temperature environments. It is capable of maintaining its properties at temperatures up to around 1300�°F (700�°C), making it suitable for use in hot sections of gas turbine engines, nuclear reactor components, and other high-temperature applications.
In addition to its mechanical and corrosion resistance properties, Haynes 718 alloy also has good weldability and machinability. It can be readily welded using a range of methods, and can be easily machined using standard metalworking techniques.
Overall, Haynes 718 alloy is a versatile and reliable material that has proven itself in a wide range of demanding applications. Its combination of high strength, toughness, and resistance to corrosion and high-temperature environments make it an ideal choice for use in critical components where reliability and performance are paramount.
Haynes 718 alloy standards vary by country. Here are some of the common ones:
United States Standards: AMS 5596: Standard Specification for Nickel Alloy, Corrosion and Heat-Resistant, Sheet, Strip, and Plate, Haynes 718 AMS 5662: Standard Specification for Nickel Alloy, Bars, Forgings, and Rings, Haynes 718 AMS 5663: Standard Specification for Nickel Alloy, Bars, Forgings, and Rings, Haynes 718 (UNS N07718) AMS 5664: Standard Specification for Nickel Alloy, Bars, Forgings, and Rings, Haynes 718 (UNS N07718) AMS 5832: Standard Specification for Nickel Alloy, Corrosion and Heat-Resistant, Welding Wire, Haynes 718 AMS 5962: Standard Specification for Nickel Alloy, Corrosion and Heat-Resistant, Bars, Forgings, and Rings, Haynes 718 AMS 5838: Standard Specification for Nickel Alloy, Corrosion and Heat-Resistant, Welding Wire, Haynes 718SPF

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GB/JIS:NW7718/UNS:NW7718/W.Nr:2.4668