What is the difference between Inconel 800 and 825?
Incoloy 825 and Incoloy 800 are austenitic nickel-based alloys with excellent corrosion resistance. Incoloy 825 flanges have higher chromium, molybdenum, and copper contents than Inconel 800. This improves pitting resistance and increases tensile strength to 1800MPa (262 ksi). In addition, it can be used in reducing conditions due to its excellent protection against chloride crevice corrosion and stress corrosion cracking. On the other hand, Incoloy 800 has better oxidation characteristics at very high temperatures. Therefore, it is more suitable for applications with higher temperature requirements than 825 flanges, but does not perform well in corrosive environments such as the latter.
What are Incoloy 825 flanges?
Incoloy 825 flanges are corrosion-resistant nickel-based alloy flanges. They are made of austenitic stainless steel combined with chromium, iron, and other elements such as molybdenum and copper. In highly corrosive environments, these alloys provide excellent protection against pitting, crevice corrosion, and stress cracking. Incoloy 825 flanges also have good mechanical properties, making them ideal for demanding applications such as chemical processing equipment and nuclear fuel handling components.
What are Incoloy 800 flanges?
Incoloy 800 flanges are high-temperature flanges made from a nickel-iron-chromium alloy with the addition of aluminum and titanium. They have excellent resistance to corrosion, oxidation, and carburization at temperatures up to 1100°F (593°C). As a result, these flanges are ideal for refineries, petrochemical plants, and other industries that deal with extreme heat. In addition, Incoloy 800 flanges have impressive tensile strength and good fatigue properties even after prolonged exposure to harsh environments.
Incoloy 825 Flanges vs. Incoloy 800 Flanges
Composition
Incoloy 825 is a nickel-iron-chromium alloy that contains molybdenum, copper, and titanium. It has strong corrosion resistance, especially in sour environments, and has good mechanical properties. On the other hand, Incoloy 800 is a nickel-iron-chromium alloy that also contains small amounts of aluminum and titanium. It also has corrosion resistance and good mechanical properties, but is best suited for high-temperature environments up to 1100°C.
Heat resistance
Regarding heat resistance, both Incoloy 825 and Incoloy 800 have high melting points. However, Incoloy 800 is better suited for high-temperature applications than Incoloy 825. Incoloy 825 has a maximum operating temperature of 540°C, while Incoloy 800 can withstand temperatures up to 1100°C. Therefore, if your project requires flanges that can withstand extreme heat, Incoloy 800 is a better choice.
Corrosion resistance
Both Incoloy 825 and Incoloy 800 have excellent corrosion resistance. However, Incoloy 825 is particularly resistant to corrosion in acidic environments, such as sulfuric and phosphoric acids. It also has strong resistance to stress corrosion cracking and pitting. In comparison, Incoloy 800 is more suitable for high temperature environments and is more resistant to oxidation and carburization that may occur in high temperature environments.
Applications
Incoloy 825 is commonly used in chemical processing equipment, oil and gas production, and pollution control. It is also used in marine and offshore engineering and nuclear fuel reprocessing. On the other hand, Incoloy 800 is often used in applications involving high temperature environments, such as furnace components, heat exchangers, and chemical and petrochemical processing equipment.
