Incoloy 825 and Incoloy 800 are austenitic nickel-based alloys with outstanding corrosion resistance. Incoloy 825 flanges
offer higher chromium, molybdenum, and copper content compared to Inconel 800. This improved pitting resistance and enhanced tensile strength up to 1800MPa (262 ksi). Moreover, it can be used in reducing conditions due to its superior protection against chloride crevice corrosion and stress corrosion cracking. On the other hand, Incoloy 800 has better oxidation characteristics at very high temperatures. Thus it is more suitable for applications with higher temperature requirements than 825 flanges but will not perform well in corrosive environments like the latter ones.
What are Incoloy 825 Flanges?
Incoloy 825 Flanges are corrosion-resistant, nickel-based alloy flanges. They are made of austenitic stainless steel with a combination of chromium, iron, and other elements such as molybdenum and copper. In highly corrosive environments, these alloys offer superior protection against pitting, crevice corrosion, and stress cracking. Incoloy 825 flanges also have good mechanical properties making them ideal for use in demanding applications like chemical processing equipment and nuclear fuel handling components.
What are Incoloy 800 Flanges?
Incoloy 800 Flanges are high-temperature flanges made of a nickel-iron-chromium alloy with added aluminium and titanium. They have excellent corrosion, oxidation, and carburization resistance at temperatures up to 1100°F (593°C). As such, these flanges are ideal for oil refineries, petrochemical plants, and other industries that handle extreme heat. Additionally, Incoloy 800 Flanges offer 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 containing molybdenum, copper, and titanium. It is highly resistant to corrosion, particularly in acidic environments, and has good mechanical properties. On the other hand, Incoloy 800 is a nickel-iron-chromium alloy that also contains small amounts of aluminium and titanium. It is also corrosion-resistant and has 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 a flange that can withstand extreme heat, Incoloy 800 is the 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 acid. It is also highly resistant to stress corrosion cracking and pitting corrosion. In contrast, Incoloy 800 is better suited for high-temperature environments and is more resistant to oxidation and carburization, which can occur in high-heat 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. Incoloy 800, on the other hand, is typically used in applications that involve high-temperature environments, such as furnace components, heat exchangers, and chemical and petrochemical processing equipment.
Cost
The cost of Incoloy 825 is generally lower than that of Incoloy 800. This is because Incoloy 825 contains less nickel than Incoloy 800, which makes it more affordable. However, the cost of the flanges may vary depending on the manufacturer, size, and quantity ordered.
Conclusion:
When it comes to determining which flange material is best for your project, it ultimately comes down to your specific needs. If you need a flange that can withstand extreme heat, then Incoloy 800 is the better choice. However, if your project involves acidic environments or requires resistance to stress corrosion cracking and pitting corrosion, then Incoloy 825 is the better choice. Remember that the cost can also be a factor, as Incoloy 825 is generally the more affordable. Regardless of which material you choose, work with a reliable and experienced manufacturer to ensure your equipment’s highest quality and functionality.