Both Inconel 600 and Incoloy 800 are commonly used high temperature alloys. They perform similarly.
But in every aspect, Inconel 600 outperforms Incoloy 800.
Despite some differences, both alloys exhibit excellent corrosion resistance. Inconel 600 alloy performs well in acidic environments, especially for corrosive substances such as sulfuric acid and hydrochloric acid. It is widely used in the chemical processing industry, where resistance to a wide range of chemicals is critical.
However, Incoloy800 alloy excels in resistance to oxidation and carburization at high temperatures. It is well suited for applications in oxidizing atmospheres and environments where contact with corrosive substances is not a big concern. This makes it a reliable choice for high temperature applications in industrial environments.
More iron is added to Incoloy 800 to save costs. In comparison, Incoloy 800 has a lower nickel content than Inconel 600. The lower nickel content will inevitably lead to a reduction in the corrosion resistance of the material.
To reduce this effect, Incoloy 800 has more chromium added to improve the resistance of the material to oxidation. Incoloy 800 also contains some aluminum, which further enhances its high temperature corrosion resistance. Overall, Inconel 600 has better oxidation resistance than Incoloy 800.
Inconel 600 and Incoloy 800 are solid solution strengthened alloys. In both alloys, the only solid solution strengthening elements are chromium and iron. Although Incoloy 800 has more strengthening elements, it has more iron and less nickel than Inconel 600. This results in an insufficient amount of austenite. Therefore, the mechanical properties of Inconel 600 are better than those of Incoloy 800.
GNEE Main Supply standards
Inconel 600
Condenser and heat exchanger tubes: ASTM B163
Seamless pipe and tube: ASTM B167, ASTM B829
Welded pipe: ASTM B517, ASTM B775
Welded pipe: ASTM B516, ASTM B751
Welded fittings: ASTM B366
Bars, bars and wire: ASTM B166
Forgings: ASTM B564
Plate, sheet and strip: ASTM B168, ASTM B906
Incoloy 800
Condenser and heat exchanger tubes: ASTM B163
Seamless pipe and tube: ASTM B407, ASTM B829
Welded pipe: ASTM B514, ASTM B775
Welded pipe: ASTM B515, ASTM B751
Welded fittings: ASTM B366
Bars and bars: ASTM B408
Forgings: ASTM B564
Plate, sheet and strip: ASTM A240, ASTM A480.ASTM B409, ASTM B906
