Alloy 718 | 2.4668 | AMS 5662 | AMS 5663

Alloy 718 is a precipitation hardened nickel-chromium alloy with additions of niobium, molybdenum, aluminium and
titanium for improved corrosion resistance combined with extremely high strength and excellent weldability. For aerospace
applications Alloy 718 | AMS 5662 | AMS 5663 has excellent creep rupture strength at temperatures up to
700 °C. Alloy 718 achieves its strength through a precipitation hardening heat treatment and can be supplied in the
annealed condition (AMS 5662) for ease of fabrication, requiring later heat treatment to develop full strength, or in
the fully precipitation strengthened condition (AMS 5663).

Though originally developed for aerospace applications the unique combination of strength and corrosion resistance
of Alloy 718 made it candidate for applications in the oil and gas sector. As well environments became more severe
stress corrosion and hydrogen embrittlement became a challenge the chemistry and microstructure of Alloy 718 was
optimised to offer the greatest resistance and distinguishes today’s oil field grade (API 6A) from aerospace grades.
With different specification and heat treatment procedures resulting in optimised properties for the industry sector
it is important to understand which specification is required.

Please see our datasheet Alloy 718 | API6A for more information on Alloy 718 for oil and gas applications