Inconel® alloy 718

UNS N07718
W.Nr 2.4668

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.

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). 

Industries Supplied

Oil & Gas Extraction, Nuclear, Aerospace, Defense and Automotive.

Nominal Composition

C: 0.08 max
Mn: 0.35 max
Si: 0.35 max
P: 0.015 max
S: 0.015 max
Cr: 17.0 - 21.0 
Ni: 50.0 - 55.0 
Mo: 2.80 - 3.30 
Nb: 4.75 - 5.50
Ti: 0.65 - 1.15
Al: 0.20 - 0.80
Co: 1.0 max 
Fe: Balance

Physical Properties

Density: 0.296 lb/in3, (8.19 g/cm3)

Modulus of Elasticity (E): 
At 70°F (20°C): 29 x 103 ksi (200 GPa)

Modulus of Rigidity (G)
At 70°F (20°C):  11.6 x 103 ksi (80 GPa)

Coefficient of Expansion:
7.7 µin/in.-°F (70°F to 600°F)
13.9 µm/m-°C (20°C to 538°C)

Electrical Resistivity: 47.5 µΩ.in, (121 µΩ.cm)

Thermal Conductivity: 79 Btu-in/ft2hr-°F, (11.4 W/m-K)

Applicable Specifications

Strip and Foil: AMS 5596, AMS 5597, ASTM B670

Typical Mechanical Properties

  • Annealed
    • Heat Treatment: 1800°F (980°C)
    • Tensile Strength: 120 - 140 ksi (830 - 965 MPa)
    • Suggested Operating Conditions: -330°F to 1200°F (-200°C to 650°C)
  • Spring Temper
  • Tensile Strength: 180 - 230 ksi (1240 - 1585 MPa)
  • Suggested Operating Conditions: -330°F to 1200°F (-200°C to 650°C)
  •  
  • After Precipitation Heat Treat
  • Heat Treatment: Per AMS 5596
  • Tensile Strength: 190 - 240 ksi (1310 - 1655 MPa)
  • Suggested Operating Conditions: -330°F to 1200°F (-200°C to 650°C)

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

    For further information Contact:

    Email: stripinfo@elgiloy.com
    Phone: 1 888 843 2350 
    Elgiloy Specialty Metals - Strip Products
    1565 Fleetwood Dr.
    Elgin, IL 60123 USA