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Views: 0 Author: Rachel Wynn Publish Time: 2025-06-23 Origin: Site
Inconel 718 sheet is a precipitation-hardened nickel-chromium alloy (UNS N07718) widely used in aerospace, nuclear, energy, and marine industries. Known for its high strength, corrosion resistance, and exceptional performance at extreme temperatures, Inconel 718 is ideal for demanding environments where reliability and longevity are critical.
The strength and heat resistance of Inconel 718 sheet are attributed to its special alloying elements and precipitation-hardened microstructure.
| Element | Content (wt%) | Function |
|---|---|---|
| Nickel (Ni) | 50–55% | Base metal; provides high-temperature strength and corrosion resistance |
| Chromium (Cr) | 17–21% | Improves oxidation and corrosion resistance |
| Niobium + Tantalum | 4.75–5.5% | Key strengthening agent (γ'' phase) |
| Molybdenum (Mo) | 2.8–3.3% | Increases strength and pitting resistance |
| Titanium (Ti) | 0.65–1.15% | Forms strengthening γ' phase with aluminum |
| Aluminum (Al) | 0.2–0.8% | Promotes precipitation hardening |
| Iron (Fe) | Balance | Structural balance and cost efficiency |
Density: 8.19 g/cm³
Melting Point: 1260–1336 °C (2300–2436 °F)
Operating Temperature: –253 °C to ~700 °C
Hardness: 36–44 HRC (heat-treated)
Tensile Strength: ≥1240 MPa
Yield Strength: ≥1035 MPa
Elongation: 12–30%
Creep & Fatigue Resistance: Excellent
Thanks to its unique combination of strength and corrosion resistance, Inconel 718 sheet is widely used across several high-demand sectors:
Aerospace: Turbine blades, exhaust systems, engine parts
Power Generation: Gas turbines, nuclear heat exchangers
Oil & Gas: Subsea tools, downhole components, valves
Marine: Pumps, fasteners, high-pressure parts
3D Printing: Powder bed fusion, direct energy deposition (DED)
Due to its work-hardening tendency, Inconel 718 requires slow-speed machining with rigid tool setups and high-performance cutting fluids.
It offers excellent weldability, even in fully-aged condition. It resists post-weld cracking, and often does not require post-weld heat treatment.
The alloy undergoes solution annealing followed by age hardening to develop high strength and microstructural stability.
A: It can be used from cryogenic temperatures (–253 °C) up to around 700 °C, making it ideal for both aerospace and energy applications.
A: Yes. It offers excellent weldability without susceptibility to post-weld cracking, even in the hardened state.
A: Inconel 718 is stronger due to precipitation hardening, while Inconel 625 offers better corrosion resistance in seawater and acid environments.
A: Absolutely. Inconel 718 is widely used in additive manufacturing due to its weldability and high-temperature performance.
Inconel 718 sheet is a superior material for critical applications requiring strength, reliability, and corrosion resistance. Whether you're in aerospace, energy, or marine sectors, this alloy offers long-term value in demanding environments. Contact us today to learn more or request a datasheet or quote.
