When it comes to high-temperature applications, the choice of material for various components is essential. Inconel 600 and 718 are typical superalloys popular in many industries, including aerospace, oil and gas, and chemical processing. Both alloys have outstanding mechanical properties ideal for high-temperature and corrosive environments. In this blog post, we’ll explore the differences between Inconel 600 and 718 to help you decide which alloy to choose for your specific application.

What is Inconel 600?

Inconel 600 is a nickel-chromium alloy that offers good resistance to corrosion and oxidation. The alloy also has good mechanical properties and can be formed into various shapes. Inconel 600 is typically used in high-temperature applications such as heat exchangers, furnaces, and chemical processing equipment.

What is Inconel 718?

Inconel 718 is a nickel-chromium alloy that offers excellent resistance to corrosion and oxidation. The alloy also has excellent mechanical properties and can be formed into various shapes. Inconel 718 is typically used in high-temperature applications such as jet engines, gas turbines, and chemical processing equipment.

Difference Between Inconel 600 and 718

Composition

Inconel 600, also known as alloy 600, is a nickel-chromium alloy with good corrosion resistance properties. It contains around 76% nickel, 15% chromium, and small amounts of iron, carbon, and other elements. The alloy has excellent mechanical properties, high strength, and good weldability, making it ideal for high-temperature applications.

On the other hand, Inconel 718 is a nickel-based superalloy with a composition of around 52% nickel, 19% chromium, and small amounts of iron, niobium, and molybdenum. The alloy is famous for its high-temperature strength, good corrosion resistance, and outstanding fatigue properties. Inconel 718 is a good choice for parts that require high resistance to stress rupture and fatigue.

Temperature Resistance

Both Inconel 600 and 718 exhibit excellent high-temperature properties. Inconel 600 can withstand temperatures up to 1100°C (2000°F) and retain much of its strength at elevated temperatures. The alloy resists oxidation, carburization, and other forms of corrosion, making it ideal for use in furnace components, heat exchangers, and chemical processing equipment.

Inconel 718, on the other hand, can withstand temperatures of up to 704°C (1300°F) for continuous operation. The alloy can reach even higher temperatures but may experience creep deformation and reduced properties when exposed to elevated temperatures for extended periods. Inconel 718 is an excellent choice for gas turbine engine components, heat exchangers, and aerospace applications.

Corrosion Resistance

Both Inconel 600 and 718 possess excellent corrosion resistance properties. Inconel 600 is resistant to oxidation, sulfidation, and other forms of high-temperature corrosion. The alloy also provides good resistance to low-temperature rot and stress-corrosion cracking.

On the other hand, Inconel 718 is highly resistant to corrosion and oxidation in various environments, including seawater, alkaline, and acidic solutions. The alloy also protects against pitting, intergranular corrosion, and crevice corrosion. Inconel 718 is thus an excellent choice for marine and chemical processing applications.

Applications

Inconel 600 finds application in various industries, including chemical processing, furnace components, heat exchangers, and electricity generation. The alloy is also used in medical equipment, aerospace, and nuclear industry applications.

Inconel 718, on the other hand, finds extensive use in the aerospace industry, where its high-temperature properties, fatigue resistance, and high strength make it ideal for gas turbine engine components, rotor and shaft assemblies, and combustion chambers. The alloy is also used in chemical processing, nuclear, and offshore industries, providing excellent corrosion resistance and strength.

Difference in Price

Another difference between Inconel 600 and 718 is their price. In general, Inconel 600 is less expensive than Inconel 718 due to its more straightforward composition. However, the cost of both alloys will vary depending on the specific grade and supplier.

Conclusion

Inconel 600 and 718 are the most popular superalloys in high-temperature and corrosive environments. While both materials exhibit excellent properties, their differences can make one alloy more suitable for specific applications. When selecting the suitable alloy for your application, you must know the composition, temperature and corrosion resistance, and the application where you intend to use the alloy.

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