Inconel 718, Alloy 718, 2.4668, N07718

Grade	Code	UNS	Nickel Alloys
Inconel 718	Alloy 718 (2.4668)	N07718	Nickel Alloys

Nickel Alloy Properties

Inconel 718 / Alloy 718 is a precipitation-hardenable nickel-chromium-based superalloy containing significant amounts of iron, niobium and molybdenum, together with smaller additions of titanium and aluminum. This composition provides a strong combination of high mechanical strength, good corrosion resistance and favorable fabrication characteristics.

Chemical Composition (Inconel 718 / Alloy 718)

Ni %	Cr %	Nb+Ta %	Mo %	Mn %	Si %	Al %	Ti %	Co %	Cu %	Fe %
50.00 – 55.00	17.00 – 21.00	4.75 – 5.50	2.80 – 3.30	0.35 max.	0.35 max.	0.20 – 0.80	0.65 – 1.15	1.00 max.	0.30 max.	Balance

Mechanical Properties (Solution Annealed)

Product Form	Rp0.2, MPa	Rm, MPa	Elongation [%]	Hardness [HB]	Density [g/cm³]
Round Bar	483	931	45	≈240*	8.2
Plate (AMS 5596)	≤724	≤1034	≥30	≈253*	8.2

* HB values are approximate conversions.

Applications

Industry	Most Common Products
Aerospace	Turbine discs, engine/turbine casings, fastening components
Energy / Gas Turbines	Turbine rings, turbine casings, formed sheet components
Space & Rocket Systems	Rocket propulsion components, liquid-fuel rocket parts, spacecraft components
Oil & Gas	Hanger/packer systems, completion tools, pump shafts
Automotive	Turbocharger heat shields, turbocharger gaskets, high-temperature turbocharger components
Fasteners / Machinery	High-strength bolts and screws, springs, fastening components
Industrial Manufacturing / Tooling	Forging dies, extrusion tooling, hot-cutting/shearing tools

Additional Information

Inconel 718 / Alloy 718 stands out for its comparatively good weldability despite its high strength, and it shows lower susceptibility to strain-age cracking than many other precipitation-hardened nickel superalloys. The alloy can be hot- and cold-formed; however, its high strength and work-hardening tendency require suitable tooling and controlled cutting conditions during machining. Aging after solution annealing significantly increases its mechanical strength. Inconel 718 / Alloy 718 is widely used where high mechanical strength is required from cryogenic conditions up to about 650°C, and may also be considered for service approaching 700°C under specific design and operating conditions.