Inconel 718/GH4169/UNS N07718/2.4668/NiCr19Fe19Nb5Mo3 Bar/Rod/Wire/Forging/Plate/Strip Excellent Mechanical Properties In High-stress Environments
Inconel 718 (UNS N07718 / GH4169 / 2.4668 / NiCr19Fe19Nb5Mo3) is a precipitation-hardenable nickel-chromium alloy known for exceptional high-temperature strength, creep resistance, and corrosion resistance. Usable from cryogenic temperatures up to ~700°C, it offers excellent tensile, fatigue, and rupture strength. The alloy contains niobium, molybdenum, and iron, enhancing mechanical properties and oxidation resistance. It is easily weldable, machinable, and maintains stability under extreme heat and stress. Available in Bar, Rod, Wire, Forging, Plate, and Strip, Inconel 718 is widely used in aerospace, gas turbines, nuclear reactors, and oil & gas sectors for critical parts like turbine discs, fasteners, and structural components. It balances high performance with outstanding workability.
| Chemical Composition Wt.% | % | Fe | Cr | P | Cu | Ni | Al | Ti | C | Mn | Si | S | Mo |
| Min | | 23.5 | | | Bal. | | 0.3 | | | | | |
| Max | 4 | 26.5 | 0.013 | 0.07 | Bal. | 0.5 | 0.7 | 0.1 | 0.5 | 0.8 | 0.013 | 1.5 |
| Physical Constants | Density(g/cm³) | 8.89 |
| Melting Range(℃) | 1352-1375 |
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Overview of Inconel 718
Inconel 718 is a nickel-chromium alloy known for its exceptional high-temperature strength, corrosion resistance, and outstanding weldability, especially in the age-hardened condition. It is precipitation-hardenable, making it one of the most widely used superalloys in aerospace, energy, and marine industries.
Key Features (All Forms)
Excellent High-Temperature Strength
- Maintains strength up to 700°C (1300°F).
- Superior creep-rupture resistance, ideal for long-term service at high temps.
Outstanding Corrosion and Oxidation Resistance
- Excellent resistance to oxidation, chloride stress corrosion, pitting, and general corrosion in harsh environments.
- Performs well in aerospace, chemical, and marine atmospheres.
Precipitation Hardening for High Strength
- Strengthened via precipitation of gamma prime (γ') and gamma double prime (γ″) phases.
- Very high yield, tensile, and fatigue strength even after long service at elevated temperatures.
Excellent Weldability
- Unlike many high-strength alloys, Inconel 718 has excellent weldability without risk of post-weld cracking.
- Used extensively in welded structural components.
Resistance to Mechanical Fatigue & Stress
- High resistance to mechanical fatigue, thermal fatigue, and vibration.
- Suitable for rotating parts like turbine discs and shafts.
Form-Specific Applications
Bar / Rod
- Used for aircraft engine parts, fasteners, bolts, shafts, and load-bearing structures in hot zones.
- High tensile strength and fatigue resistance.
Wire
- Ideal for spring wire, lock wire, welding filler wire, and high-temp fastening systems.
- Good ductility and strength.
Forging
- Forged into turbine discs, rings, shafts, flanges, and rotor parts.
- Excellent stability under high mechanical stress.
Plate / Strip
- Used in gas turbines, rocket engines, chemical vessels, and nuclear power plant components.
- Great formability and post-weld strength retention.
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Inconel 718/GH4169/UNS N07718/2.4668/NiCr19Fe19Nb5Mo3 Bar/Rod/Wire/Forging/Plate/Strip Images
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