Changzhou Victory Technology Co., Ltd
Changzhou Victory Technology Co., Ltd
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ASTM B670 AMS 5596 UNS N07718 Nickel Alloy 718 Inconel 718 Strip, Slit Coil, Foil Sheet
Inconel 718 is a high-strength, corrosion-resistant nickel-chromium-based superalloy, renowned for its outstanding performance in extreme environments, including high temperatures, corrosive settings, and high-stress conditions. Inconel 718 is widely used in various industries such as aerospace, oil and gas, nuclear power, and automotive due to its exceptional mechanical properties and resistance to oxidation.
Inconel 718's microstructure is primarily composed of a face-centered cubic (FCC) austenitic matrix with precipitates of γ'' (Ni3Nb) and γ' (Ni3(Al,Ti)). These precipitates are responsible for the alloy's high strength and resistance to creep at elevated temperatures. The γ'' phase is the main strengthening phase, providing superior mechanical properties up to 700°C (1292°F).
Inconel 718 exhibits a unique combination of excellent mechanical properties, including:
High Tensile Strength: Inconel 718 maintains its tensile strength up to temperatures as high as 700°C (1292°F). The alloy's ultimate tensile strength typically ranges from 965 MPa to 1379 MPa, depending on the heat treatment applied.
Good Creep Resistance: The alloy demonstrates significant resistance to creep deformation under high stress and temperature conditions, making it suitable for long-term applications in high-temperature environments.
Superior Fatigue Strength: Inconel 718's fatigue strength is enhanced by its fine-grain structure and the presence of precipitates, enabling it to withstand cyclic loading conditions effectively.
Excellent Weldability: Unlike many other high-strength superalloys, Inconel 718 is weldable, with a reduced tendency for cracking during the welding process due to its lower carbon content and controlled niobium levels.
One of the defining characteristics of Inconel 718 is its excellent resistance to oxidation and corrosion. The high chromium content provides protection against oxidation in both static and dynamic conditions, while the presence of molybdenum enhances its resistance to pitting and crevice corrosion in aqueous environments. The alloy is also resistant to chloride-ion stress-corrosion cracking, which is particularly advantageous in offshore and marine applications.
Thanks to its robust properties, Inconel 718 is utilized in a wide range of demanding applications, including:
Aerospace: Used in the manufacture of jet engine components, such as turbine blades, discs, and seals, as well as rocket motors and space vehicles due to its ability to withstand high temperatures and extreme mechanical stress.
Oil and Gas: Employed in downhole tooling, wellhead components, and other high-stress environments where resistance to sulfide stress cracking and high-strength requirements are essential.
Nuclear Power: Applied in reactor cores, control rod components, and other high-temperature environments due to its stability and resistance to radiation damage.
Automotive: Used in high-performance vehicles for turbocharger rotors and other critical components exposed to high temperatures and mechanical stress.
Inconel 718 remains a material of choice for industries requiring high performance in extreme environments. Its unique combination of mechanical strength, corrosion resistance, and versatility makes it invaluable in aerospace, oil and gas, nuclear, and automotive industries. Ongoing research and development continue to expand the applications and enhance the properties of Inconel 718, ensuring its relevance in the future of advanced engineering solutions.
Inconel Alloy Series Composition:
| Item | Inconel 600 | Inconel 601 | Inconel 617 | Inconel 625 | Inconel 690 | Inconel718 | Inconel X750 | Inconel 825 |
| C | ≤0.15 | ≤0.1 | 0.05-0.15 | ≤0.08 | ≤0.05 | ≤0.08 | ≤0.08 | ≤0.05 |
| Mn | ≤1 | ≤1.5 | ≤0.5 | ≤0.35 | ≤0.5 | ≤0.35 | ≤1 | ≤1 |
| Fe | 6-10 | rest | ≤3 | rest | 7-11 | rest | 5-9 | ≥22 |
| P | ≤0.015 | ≤0.02 | ≤0.015 | -- | -- | -- | -- | -- |
| S | ≤0.015 | ≤0.015 | ≤0.015 | ≤0.015 | ≤0.015 | ≤0.01 | ≤0.01 | ≤0.03 |
| Si | ≤0.5 | ≤0.5 | ≤0.5 | ≤0.35 | ≤0.5 | ≤0.35 | ≤0.5 | ≤0.5 |
| Cu | ≤0.5 | ≤1 | -- | ≤0.3 | ≤0.5 | ≤0.3 | ≤0.5 | 1.5-3 |
| Ni | ≥7.2 | 58-63 | ≥44.5 | 50-55 | ≥58 | 50-55 | ≥70 | 38-46 |
| Co | -- | -- | 10-15 | ≤10 | -- | ≤1 | ≤1 | -- |
| Al | -- | 1-1.7 | 0.8-1.5 | ≤0.8 | -- | 0.2-0.8 | 0.4-1 | ≤0.2 |
| Ti | -- | -- | ≤0.6 | ≤1.15 | -- | ≤1.15 | 2.25-2.75 | 0.6-1.2 |
| Cr | 14-17 | 21-25 | 20-24 | 17-21 | 27-31 | 17-21 | 14-17 | 19.5-23.5 |
| Nb+Ta | -- | -- | -- | 4.75-5.5 | -- | 4.75-5.5 | 0.7-1.2 | -- |
| Mo | -- | -- | 8-10 | 2.8-3.3 | -- | 2.8-3.3 | -- | 2.5-3.5 |
| B | -- | -- | ≤0.006 | -- | -- | -- | -- | -- |
| Property | Description |
|---|---|
| Alloy Type | Nickel-based superalloy |
| Chemical Composition | Nickel (50-55%), Chromium (17-21%), Iron (bal.), Molybdenum (2.8-3.3%), Niobium + Tantalum (4.75-5.5%), Titanium (0.65-1.15%), Aluminum (0.2-0.8%), and trace elements. |
| Density | 8.19 g/cm³ |
| Melting Point | 1260-1336°C (2300-2437°F) |
| Tensile Strength | Up to 1240 MPa (180 ksi) |
| Yield Strength | Up to 1035 MPa (150 ksi) |
| Hardness | Typically 330-400 HB (Brinell Hardness) |
| Elongation | 12-20% (varies based on heat treatment) |
| Modulus of Elasticity | Approximately 200 GPa (29 x 10⁶ psi) |
| Corrosion Resistance | Excellent resistance to oxidation and corrosion, especially in high-temperature environments. |
| Thermal Conductivity | 11.2 W/m·K (at room temperature) |
| Electrical Resistivity | 1.25 µΩ·m |
| Operating Temperature | Up to 700°C (1292°F) for prolonged periods, with short-term use at higher temperatures possible. |
| Heat Treatment | Solution annealed and precipitation hardened to improve mechanical properties. |
| Applications | Aerospace (turbine engines), nuclear reactors, chemical processing, oil & gas, marine industries. |
| Weldability | Good, but requires specific procedures to avoid cracking. |
| Machinability | Moderate to difficult; requires rigid tooling and slower speeds due to high strength and hardness. |
This table provides a comprehensive overview of the key properties and details of Inconel 718. Let me know if you need any additional information or modifications!
