Inconel Alloy 600 vs. Incoloy Alloy 800

When it comes to high-performance nickel alloys, Inconel Alloy 600 and Incoloy Alloy 800 are prominent choices, each with its unique set of characteristics. In this comparison, we will explore these alloys, highlighting their key properties and applications, helping you make informed decisions for your specific engineering requirements.

Composition and Structure

Inconel Alloy 600 is primarily a nickel-chromium-iron alloy known for its corrosion resistance and high mechanical strength. It boasts a combination of approximately 72% nickel, 14-17% chromium, and 6-10% iron that provides an excellent balance of attributes. This composition offers not only corrosion resistance but also impressive mechanical properties, making it a versatile engineering material.

Incoloy Alloy 800 on the other hand, is a widely recognised alloy designed to meet the demands of high-temperature applications. Its composition includes approximately 32-39% nickel, 21-23% chromium, 0.75-1.25% iron, and a small percentage of copper, which enhances its resistance to oxidation and carburisation at elevated temperatures. Incoloy 800's ability to perform under extreme heat conditions sets it apart in applications requiring strength and stability at temperatures up to 1500°F (816°C).

Temperature Resistance

Incoloy alloy 800 excels in high-temperature environments. It can maintain its mechanical properties even when subjected to temperatures as high as 1500°F (816°C). This capability makes it a preferred choice for applications like furnace components and heat-treating equipment, where exposure to extreme heat is a constant challenge.

In contrast, Inconel alloy 600, while still offering impressive temperature resistance, is better suited for applications with temperature requirements up to approximately 2000°F (1095°C). Therefore, the selection between these alloys depends on your specific temperature range needs.

Corrosion Resistance

Both alloys exhibit excellent corrosion resistance, albeit with some differences. Inconel alloy 600 stands out in acidic environments, particularly against corrosive substances like sulfuric and hydrochloric acids. It is widely used in the chemical processing industry, where resistance to a broad range of chemicals is crucial.

Incoloy alloy 800, however, shines in resisting oxidation and carburisation at high temperatures. It is well-suited for applications in oxidising atmospheres and environments where exposure to corrosive substances is less of a concern. This makes it a dependable choice for high-temperature applications in industrial settings.

Mechanical Properties

Incoloy alloy 800 boasts superior high-temperature strength, making it ideal for applications requiring strength and stability at elevated temperatures. Its nickel content contributes to remarkable mechanical properties, ensuring reliability in high-stress scenarios.

Inconel alloy 600 maintains good mechanical properties at lower temperatures but may experience some reduction in strength at higher temperatures compared to Incoloy 800. Therefore, the choice between the two alloys depends on the mechanical demands of your specific application.


Both alloys are weldable using standard methods, but Incoloy 800 exhibits better weldability. It retains its properties even after welding, provided recommended procedures are followed. Inconel alloy 600, while weldable, may require more attention to post-weld heat treatment to restore its properties.

Applications of alloy 600 vs alloy 800

Inconel alloy 600 finds extensive use in the chemical processing industry, aerospace applications (such as jet engine components), and various engineering systems where corrosion resistance and high mechanical strength are essential.

Incoloy alloy 800's niche lies in high-temperature applications, particularly in industrial furnace components, heat-treating equipment, and petrochemical processing. Its ability to withstand extreme heat and maintain stability is invaluable in these demanding environments.

Inconel alloy 600 and Incoloy alloy 800 are formidable nickel alloys with unique attributes suited for diverse applications. The selection between these alloys should be based on your application's specific needs, considering factors like temperature, corrosion resistance, mechanical strength, and budget. For expert guidance and high-quality materials tailored to your project, Corrotherm's experienced team is here to assist you. Contact us today to make the right alloy choice for your engineering endeavours.

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