Inconel 718 Alloy

UNS N07718
W.Nr 2.4668

Inconel 718 Alloy

  • AMS 5596
  • AMS 5597
  • ASTM B670

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Inconel 718 Description:

Inconel® 718 is an age-hardenable Nickel-Chromium-Columbium (Niobium)-Molybdenum alloy with high strength, corrosion-resistance, and good fabrication characteristics. Inconel® 718 has high tensile, yield, and creep-rupture properties at high temperatures up to 1200°F (650°C).


Inconel 718 Uses & Applications:

Alloy 718 combines properties which make it suitable for a variety of fabricated component applications in both aircraft turbine engines and land-based turbines. These include seals, bellows, and many types of stamped metal components. The alloy is used in downhole and well head components for oil and gas wells.

Industries supplied include:

  • Oil & Gas Extraction
  • Nuclear
  • Aerospace
  • Defense
  • Automotive

Nominal Composition


Physical Properties

At 70°FAt 20°C
Density0.296 lb./in³8.19 g/cm³
Modulus of Elasticity (E)29 x 10³ ksi200 GPa
Modulus of Rigidity (G)11.6 x 10³ ksi80 GPa
Coefficient of Expansion7.7 microinches/in.-°F (°F)13.9 μm/m-°C (°C)
Electrical Resistivity47.5 μ ohm.in121 μ
Thermal Conductivity79 Btu-in./ft.²hr.-°F11.4 W/m-K

Typical Mechanical Properties

ConditionHeat TreatmentTensile StrengthSuggested Operating Conditions
Annealed1800°F (980°C)120 – 140 ksi (830-965 MPa)-330°F to 1200°F (-200°C to 650°C)
Spring Temper180 – 230 ksi (1240 – 1585 MPa)-330°F to 1200°F (-200°C to 650°C)
After Precipitation Heat TreatPer AMS 5596190 – 240 ksi (1310 – 1655 MPa)-330°F to 1200°F (-200°C to 650°C)

* INCONEL® is a registered trademark of the Special Metals Corporation group of companies.

Limitation of Liability and Disclaimer of Warranty:
  • The content in these data sheets is provided primarily by third-party melting mills and is provided for reference only. It is not intended for engineering or design.
  • Applications may be discussed, however, Combined Metals Company, LLC, does not recommend or endorse any material for any particular end use or application.
  • The data included in this data sheet are typical values and may vary.
  • Combined Metals Company, LLC, makes no representations or warranties, express or implied, as to the accuracy, completeness, condition, suitability, performance, fitness for a particular purpose, or merchantability of any information contained in any data sheet.

In no event will Combined Metals Company, LLC, be liable for any damages whatsoever arising from the use of the information included in the data sheets.


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