Gnee Steel is a professional manufacturer of various Inconel 718 alloys, nickel-based alloys, Hastelloy alloys, and high-temperature alloy materials. Founded in 2008, the company specializes in the production and sales of alloy materials. Gnee Steel's products are widely used in aerospace, chemical, power generation, automotive, nuclear energy, and other fields, and the company can provide customized alloy material solutions according to customer needs. If you need to inquire about alloy material prices or customized solutions, please feel free to contact our sales staff.
Comparison of Inconel 617 alloy and Inconel 718 alloy for high-temperature applications
Comparison of Inconel 617 alloy and Inconel 718 alloy for high-temperature applications
Both Inconel 617 and 718 are nickel-based superalloys designed for high-temperature environments, but they have different areas of strength: Inconel 617 exhibits excellent oxidation/carburization resistance and strength at temperatures above 800°C, making it ideal for nuclear power and gas turbine applications. Inconel 718 offers the highest tensile strength and creep resistance at temperatures below 700°C, and is commonly used in the aerospace industry.
At what temperature does Inconel 718 oxidize?
1223 K to 1573 K
In a normal atmospheric environment, the oxidation rate of Inconel 718 exhibits a parabolic behavior and is diffusion-controlled over a wide temperature range of 1223 K to 1573 K for extended periods (up to several weeks). When the temperature exceeds 1573 K, oxidation becomes very severe, and the material undergoes significant deformation.
Inconel 718 is a nickel-chromium-based superalloy that achieves precipitation hardening through elements such as niobium and molybdenum. Its core characteristic is maintaining ultra-high strength, excellent creep and fatigue resistance, and good corrosion resistance at temperatures up to approximately 700°C. It is widely used in the manufacture of critical components subjected to extreme stress, high temperatures, and complex loads, such as aircraft engine turbine discs, blades, and casings, aerospace structural components, high-performance racing car parts, and oil and gas drilling tools. It is one of the most important and widely used superalloys in the aerospace and energy sectors.
Inconel 617 is a nickel-chromium-cobalt superalloy strengthened by cobalt, molybdenum, and aluminum. Its core characteristic is its exceptionally excellent oxidation, carburization, and hot corrosion resistance at extreme temperatures up to approximately 1100°C, while maintaining excellent high-temperature strength and creep resistance. It is specifically designed for critical environments requiring long-term exposure to high-temperature corrosive atmospheres and high stress, such as gas turbine components, high-temperature heat treatment equipment, chemical cracking furnaces, and advanced nuclear energy systems. It is particularly suitable for demanding conditions involving high-temperature oxidation and thermal fatigue, making it one of the top materials for ultra-high-temperature industrial applications.
Chemical Composition: Inconel 617 vs. Inconel 718
| Element | Inconel 617 (UNS N06617) Content (%) | Inconel 718 (UNS N07718) Content (%) |
|---|---|---|
| Nickel | 44.5 min (Balance) | 50.0 – 55.0 |
| Chromium | 20.0 – 24.0 | 17.0 – 21.0 |
| Cobalt | 10.0 – 15.0 | ≤ 1.00 |
| Molybdenum | 8.0 – 10.0 | 2.80 – 3.30 |
| Iron | ≤ 3.0 | Balance |
| Aluminum | 0.8 – 1.5 | 0.20 – 0.80 |
| Titanium | ≤ 0.6 | 0.65 – 1.15 |
| Carbon | 0.05 – 0.15 | ≤ 0.08 |
| Manganese | ≤ 1.0 | ≤ 0.35 |
| Silicon | ≤ 1.0 | ≤ 0.35 |
| Copper | ≤ 0.5 | ≤ 0.30 |
| Phosphorus | ≤ 0.015 | ≤ 0.015 |
| Sulfur | ≤ 0.015 | ≤ 0.015 |
| Boron | ≤ 0.006 | ≤ 0.006 |
| Niobium | – | 4.75 – 5.50 |
| Tantalum | – | ≤ 0.05 |
Main Differences: Inconel 617 vs. Inconel 718
Temperature Resistance: Inconel 617 has superior temperature resistance compared to Inconel 718, withstanding temperatures up to 1100°C, while Inconel 718 is more suitable for applications around 700°C. This characteristic makes Inconel 617 a better choice for ultra-high temperature environments, while engineers tend to prefer Inconel 718 for applications requiring high strength at moderate to high temperatures.
Mechanical Strength: Due to its age-hardening properties, Inconel 718 exhibits excellent mechanical strength at lower temperatures, making it ideal for aerospace and other high-stress applications. In contrast, while Inconel 617 also possesses high strength, it is not as strong as Inconel 718; however, it excels in environments requiring extremely high temperature resistance.
Corrosion Resistance: Both alloys offer excellent corrosion resistance, but Inconel 718 has a slight advantage in environments exposed to chlorides and sulfides, making it more suitable for oil and gas applications. Inconel 617 is better suited for high-temperature environments requiring excellent oxidation and carburization resistance.
Machinability: Inconel 617 is known for its good machinability, allowing manufacturers to weld and form it more easily. While Inconel 718 is also weldable, it requires careful control of the heat treatment process to achieve optimal mechanical properties.
Inconel 617 vs. Inconel 718
How to Choose Between Inconel 617 and Inconel 718 Alloys?
When choosing between Inconel 617 and Inconel 718, consider the following factors:
Temperature Requirements: If your application involves extremely high temperatures, Inconel 617 alloy may be a better choice. For applications requiring high strength at moderate to high temperatures, Alloy 718 may be more suitable.
Corrosion Resistance: In environments with high chloride or sulfide content, Nickel 718 may offer better corrosion resistance. If high-temperature oxidation resistance is required, consider Inconel 617 alloy.
Mechanical Strength: If mechanical strength is a primary consideration, especially in aerospace or other high-stress environments, Inconel 718 alloy may be a better choice due to its age-hardening properties.
Processing Requirements: If ease of processing is crucial, Inconel 617 alloy may offer greater flexibility in welding and forming.
Gnee Steel also supplies custom Inconel 718 products in various sizes and specifications. Please send us your drawings for a quote!
Gnee Steel is a professional manufacturer of various nickel-based alloys, including Nickel 201, Nickel 202, Hastelloy C-276, Hastelloy C-22, Hastelloy B, Hastelloy C-4, Inconel Alloy 600, Inconel 625, Inconel 718, Inconel X-750, Incoloy Alloy 800, Incoloy 800H/HT, Incoloy 825, Monel Alloy 400, Monel K500, and high-temperature alloys. We specialize in the production and sales of alloy materials. Gnee Steel's products are widely used in aerospace, chemical, power, automotive, and nuclear energy industries, and we can provide customized alloy material solutions according to customer needs. For alloy material price inquiries or to request customized alloy material solutions, please feel free to contact us at ru@gneesteelgroup.com for a quote.