Alloy 718 is an austenitic nickel-based super alloy which is used in applications requiring high strength to approximately 1400°F (760°C) and oxidation resistant to approximately 1800°F (982°C). Alloy 718 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 aged condition.
We stock a comprehensive range of round bars between 22mm and 142mm in diameter and flat bars with thickness of 15mm-60mm and width of 20mm-160mm.
We also offer:
Primarily manufactured in: Europe, US
Material may also be supplied to customer specifications, subject to enquiry.
Alloy 718 is hardened by the precipitation of secondary nickel- (aluminium, titanium, niobium) phases,
giving the alloy a combination of high strength and good corrosion resistance.Chemical Composition, %
Alloy 718 is distinguished from other nickel–based alloys by its composition and microstructure. Lower alloyed materials have a more uniform structure, and hence depict better machining behavior. Due to its high strength and work hardening characteristics, tooling, operating speeds and coolants should be considered.
There are generally two heat treatments used for Alloy 718:
Alloy 718 has excellent corrosion resistance in a range of environments including sea water, HS2, CO2, elemental sulphur and chloride ions over various temperatures. It is resistant to sulphide stress cracking and is capable of passing the sulphide stress corrosion test in accordance with NACE TM 0177 Method C solution A.