Drawing No. EH–MT–017 // Engineering Materials
INCONEL 718 Properties
Reviewed August 2026
INCONEL 718 is a precipitation-hardenable nickel superalloy used where high strength, fatigue/creep resistance and corrosion resistance are required over a broad temperature range.
Representative properties
The stated basis, temperature and direction are part of the value. Switch units without changing the physical reference.
What changes these properties?
Engineering variability
- Heat treatment strongly controls γ′/γ″ strengthening and therefore yield/tensile properties.
- Elastic properties are anisotropic at the single-crystal grain level; wrought product values are engineering averages.
- Thermal conductivity is low compared with steels and rises with temperature.
- For turbine/aerospace design, use product-form-specific fatigue, creep and rupture data.
Selection note
A benchmark aerospace and high-temperature alloy for turbine disks, fasteners, rocket components, springs and high-strength corrosion-resistant hardware.
Where a property is shown as qualitative rather than numeric, that is intentional: the selected source or the material physics does not justify a single comparable scalar.
How to interpret this material
Stiffness
Young’s modulus describes elastic stiffness. For crystals and composites, orientation can make one scalar modulus only a directional reference.
Strength / failure
Ductile metals can use yield and tensile strength. Brittle ceramics/semiconductors and anisotropic composites require fracture, flexural or directional strength descriptions instead.
Thermal response
Conductivity, heat capacity and expansion are temperature dependent. The last column is a melting or transition descriptor only where that physical concept is appropriate.
Technical sources
The database favors manufacturer, industry, government or academic technical references and labels secondary condition-specific datasets when a primary source does not expose a complete property set.