What is the difference between Inconel 825 and INCOLOY 825?

Dec. 12, 2023

What is the Difference Between Inconel 825 and Incoloy 825?

In the world of high-performance alloys, two names that often arise are Inconel 825 and Incoloy 825. These materials are widely used in various industries due to their excellent resistance to corrosion, high strength, and exceptional weldability. Although the names sound very similar, there are some key differences between Inconel 825 and Incoloy 825, which we will explore in this article.

Chemical Composition.

One of the primary differences between Inconel 825 and Incoloy 825 lies in their chemical compositions. Inconel 825 is classified as a nickel-iron-chromium alloy with the addition of molybdenum and copper. It has a higher nickel content compared to Incoloy 825, which provides enhanced resistance to corrosion, especially in harsh environments such as chlorides, sulfuric acid, and reducing acids.

On the other hand, Incoloy 825 is also a nickel-iron-chromium alloy but contains a higher percentage of iron. The increased iron content gives it better mechanical properties and thermal stability, making it suitable for high-temperature applications.

Mechanical Properties and Applications.

Inconel 825 and Incoloy 825 exhibit slightly different mechanical properties, making them suitable for different applications. Inconel 825 is known for its excellent corrosion resistance, which makes it ideal for use in seawater components, chemical processing, and a range of petrochemical applications. Additionally, its high strength allows it to withstand extreme environments, making it a preferred choice for applications that require resistance to both heat and corrosive substances.

Incoloy 825, with its higher iron content, offers excellent mechanical properties such as high strength and toughness. This alloy performs well in applications that involve elevated temperatures, including industrial furnaces, heat exchangers, and thermocouple sheaths. It also exhibits good resistance to sulfuric and phosphoric acids, which makes it suitable for use in chemical processing plants.

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Weldability.

When it comes to weldability, both Inconel 825 and Incoloy 825 share similar characteristics. They can be easily welded using conventional welding techniques such as gas tungsten arc welding (GTAW) and shielded metal arc welding (SMAW). Their weldability allows for the fabrication of complex components without compromising their strength or corrosion resistance.

However, it is important to note that both alloys require proper heat treatment after welding to ensure optimum performance and resistance to corrosion. Post-weld heat treatment helps to restore the alloy's microstructure and eliminate any detrimental effects caused by welding, such as sensitization.

Conclusion.

In summary, although Inconel 825 and Incoloy 825 are both excellent high-performance alloys, they have some distinct differences. Inconel 825, with its higher nickel content, offers superior corrosion resistance, while Incoloy 825, with its higher iron content, exhibits excellent mechanical properties and thermal stability. Choosing the right alloy depends on the specific application requirements, as each has its own unique advantages.

If you need further information about Inconel 825 or Incoloy 825 or would like to discuss your specific application needs, please do not hesitate to contact us. Our team of experts is always ready to assist you with any queries or assistance you may require.

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