Incoloy is a group of nickel-chromium-based high-temperature alloys resistant to corrosion and oxidation. Incoloy 800 and Incoloy 825 are two of the most popular members of this group. While they may seem similar at first glance, some significant differences make them ideal for different applications. In this blog post, we will explore these differences and help you understand the advantages and disadvantages of each material.
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Difference Between Incoloy 800 and 825
Chemical Composition
Incoloy 800 and Incoloy 825 are made of nickel, iron, and chromium. However, Incoloy 800 has a higher nickel content, ranging between 30-35%, compared to Incoloy 825, which has a nickel content between 38-46%. Incoloy 825 also contains molybdenum and copper, making it more resistant to reducing and oxidizing environments.
Mechanical Properties
Incoloy 800 has a higher yield strength and tensile strength at elevated temperatures, making it more resistant to creep and stress rupture. On the other hand, Incoloy 825 has a lower yield strength and tensile strength, but it is more ductile and easier to form.
Corrosion Resistance
Both Incoloy 800 and Incoloy 825 have excellent corrosion resistance in various environments. However, Incoloy 825 has a higher resistance to corrosion in sulfuric acid, phosphoric acid, and seawater. It is also more resistant to pitting, cracking, and carburization, making it ideal for high-stress corrosion applications.
Applications
Incoloy 800 is commonly used in steam turbines, heat exchangers, and petrochemical processing equipment. Incoloy 825, on the other hand, is used in desalination plants, offshore oil and gas exploration, and chemical processing equipment. Adding molybdenum and copper in Incoloy 825 makes it suitable for high-temperature applications where the material is exposed to corrosive and oxidizing environments.
Cost
Incoloy 800 is cheaper than Incoloy 825, which can affect the decision-making process when choosing the right material for a specific application. However, when cost is not the primary concern, Incoloy 825 provides superior performance and longer service life, making it a better long-term investment.
Conclusion
In conclusion, choosing between Incoloy 800 and Incoloy 825 depends on various factors, including the specific application, the operating environment, and the budget. Both materials are suitable for high-temperature applications and provide excellent corrosion resistance. Incoloy 800 is ideal for applications where high strength and creep resistance are essential, while Incoloy 825 is more suitable for applications where high resistance to corrosion and oxidation is critical. Ultimately, the choice depends on the specific needs of your project, and consulting with an expert can help you make an informed decision.
