Inconel 718

Inconel 718 is a precipitation-hardenable nickel-chromium-based superalloy known for its high strength, elevated-temperature performance, fatigue resistance, and corrosion resistance. Compared with Inconel 625, 718 places greater emphasis on mechanical strength and high-temperature performance, making it widely used for aircraft engines, gas turbines, and heavily loaded industrial components.

Appearance & Properties

Color: Silver-gray to bright silver-gray

Density: Approx. 8.19 g/cm³

Tensile Strength: Typically above 1,200 MPa after age hardening, depending on specification and condition

Corrosion Resistance: Excellent

High-Temperature Performance: Excellent

Machinability: Difficult

Fatigue Resistance: Excellent

Strength: Very High

Magnetism: Generally essentially non-magnetic

Surface Finishes: Blasting, polishing, passivation, grinding, PVD coating, etc.

Typical Applications

Inconel 718 is widely used in aerospace, gas turbines, energy, oil and gas, high-performance automotive systems, and high-temperature industrial equipment.

Typical parts include aircraft engine components, turbine parts, compressor components, high-temperature fasteners, shafts, valve components, energy-equipment parts, and high-strength heat-resistant CNC components.

Advantages

• Very high mechanical strength

• Excellent elevated-temperature performance

• Good fatigue and creep resistance

• Good corrosion resistance

• Particularly suitable for high-temperature, high-load components

Limitations

• Very difficult to CNC machine

• Strong tendency to work harden

• High tool wear and demanding cutting parameters

• High material and machining costs