Alloy 718 | 2.4668 | API 6A

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.

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.

For oil and gas applications Alloy 718 is produced to meet API 6A and NACE MR0175 requirements. The specification
API 6A has tighter controls on chemistry and is heat treated following a different solution annealing and precipitation
hardening procedure as compared to the AMS specifications.

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 | AMS 5662 | AMS 5663 for more information on Alloy 718 for aerospace applications.