Incoloy 800 vs 800H – What’s the Difference

Incoloy 800 vs 800H

Incoloy 800 and 800H are high-performance alloys used in various high-temperature applications. Both these alloys contain a high percentage of nickel and offer excellent resistance to corrosion and oxidation in extreme environments. However, several differences between these alloys make them suitable for different applications. In this blog post, we will explore the differences between Incoloy 800 and 800H and their respective properties that make them unique.

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Differences Between Incoloy 800 and 800H

Chemical Composition

The chemical composition of Incoloy 800 and 800H is quite different. Incoloy 800 contains 30-35% nickel, 46-50% iron, and 0.15% carbon. On the other hand, Incoloy 800H contains 30-35% nickel, 46-50% iron, and 0.05-0.1% carbon. Adding carbon in Incoloy 800H enhances its high-temperature strength and makes it resistant to creep deformation.

Resistance to High-Temperature Oxidation

Incoloy 800 and 800H offer excellent resistance to high-temperature oxidation and carburization. However, Incoloy 800H has superior oxidation resistance at temperatures above 1400°F. This makes it the preferred choice for high-temperature applications such as petrochemical processing, power generation, and gas turbine components.

Mechanical Properties

The mechanical properties of Incoloy 800 and 800H vary based on their chemical composition and heat treatment. Incoloy 800 has a yield strength of approximately 30,000 psi, while Incoloy 800H has a yield strength of approximately 35,000 psi. The higher carbon content in Incoloy 800H enhances its high-temperature strength and reduces the risk of deformation under load.

Weldability

Incoloy 800 and 800H are readily weldable using conventional welding techniques. However, the presence of carbon in Incoloy 800H can cause the formation of carbides during welding. To avoid this issue, using low-carbon filler materials and reducing the heat input during the welding process is recommended.

Applications

Incoloy 800 is typically used where resistance to high-temperature oxidation and stress rupture strength is required. It is commonly used in chemical processing, furnace components, and heat exchangers. Incoloy 800H, on the other hand, is used in applications where high-temperature strength and resistance to creep deformation are required. It is commonly used in gas turbines, petrochemical processing, and power generation.

Conclusion

In conclusion, Incoloy 800 and 800H are high-performance alloys that offer excellent resistance to corrosion, oxidation, and high-temperature environments. However, the chemical composition, mechanical properties, and resistance to oxidation and high-temperature deformation vary between these alloys. Choosing the right alloy for your application is important based on the specific requirements and operating conditions. We hope this blog post has helped you understand the differences between Incoloy 800 and 800H and their unique properties.

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