Inconel 718

Inconel 718 is the most widely used nickel-based superalloy, offering very high strength up to 704°C. It is precipitation-hardenable and resistant to creep and stress rupture at elevated temperatures, making it essential for jet engine and rocket components.

Machinability

12/100

Tolerance

±0.02 mm

Category

Superalloys

Material Properties

PropertyValue
Tensile Strength1,241 MPa (180 ksi)
Yield Strength1,034 MPa (150 ksi)
Hardness36 HRC
Density8.19 g/cm³
Machinability Rating12/100
Thermal Conductivity11.4 W/m·K
Melting Point1,260–1,336 °C
Tolerance±0.02 mm

Common Grades

718Alloy 718UNS N07718AMS 5662

Advantages

  • Very high strength at elevated temperatures
  • Excellent creep resistance
  • Age-hardenable
  • Good weldability for a superalloy

Limitations

  • Extremely difficult to machine
  • Very expensive
  • Work-hardens rapidly
  • Low thermal conductivity causes heat buildup

Common Applications

Turbine disks

Rocket engine components

Cryogenic tanks

Fasteners

Downhole tools

Industries Served

AerospaceDefenseOil & GasNuclearEnergy

Available Surface Finishes

PassivationShot PeenBead Blast

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