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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)