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
| Property | Value |
|---|---|
| Tensile Strength | 1,241 MPa (180 ksi) |
| Yield Strength | 1,034 MPa (150 ksi) |
| Hardness | 36 HRC |
| Density | 8.19 g/cm³ |
| Machinability Rating | 12/100 |
| Thermal Conductivity | 11.4 W/m·K |
| Melting Point | 1,260–1,336 °C |
| Tolerance | ±0.02 mm |
Common Grades
718Alloy 718UNS N07718aerospace material spec
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