Material No.: N08811

Standard: GB/T14992-2005 UNS AISI ASTM DIIN

Chemical composition and microstructure

Alloy N08811, commercially known as Incoloy 800HT, is a nickel-chromium-iron based superalloy designed for high temperature applications. It is part of the Incoloy 800 series, and its chemical composition includes high percentages of nickel (Ni), chromium (Cr), and moderate amounts of iron (Fe). This alloy is characterized by the addition of controlled carbon (C) and aluminum (Al) content to Incoloy 800H, which improves strength and creep resistance at elevated temperatures.The microstructure of N08811 alloy is predominantly a face-centered cubic austenite phase, which is strengthened by solid solution strengthening and fine tuning of trace elements to enhance its mechanical properties at elevated temperatures.N08811 alloy has an austenite phase that is mainly face-centered cubic and is finely tuned by solid solution strengthening and trace elements to enhance its mechanical properties at elevated temperatures.

● Chemical composition:

Cr: 19.0-23.0

Ni: 30.0-35.0

C0.10

Si: ≤1.00

Mn: ≤1.50

P：≤0.030

S：≤0.015

Fe：余

N08811 physical properties

Melting temperature range: 1350～1400°C

Specific heat capacity: 455J/(kg-°C)

Density: 8.0 g/cm3

Heat treatment and mechanical properties

N08811 alloy is typically solution heat treated to optimize its microstructure and mechanical properties. This heat treatment helps to achieve the creep and fatigue resistance required in high temperature applications. The alloy maintains good tensile strength and toughness at elevated temperatures, making it suitable for applications subjected to high temperatures and stresses for extended periods of time.

Corrosion Resistance

Alloy N08811 exhibits good performance in a wide range of corrosive environments, particularly in high-temperature oxidizing environments. It has good resistance to pitting and stress corrosion cracking (SCC), making it particularly suitable for chemical and petrochemical applications.

Areas of Application

Alloy N08811 is used in a wide range of applications in the petrochemical, power and environmental industries, especially in applications requiring high temperature and corrosion resistance. In these areas it is used in the manufacture of heat exchangers, piping, furnace internals and other equipment in high temperature environments.

Maintenance and longevity

A proper maintenance strategy is key to ensuring the long-term stable performance of N08811 alloy. Regularly inspect the physical condition of alloy components, especially if used in high temperature and corrosive environments. When cleaning the alloy, appropriate cleaning agents should be selected to avoid damaging the alloy surface.

Conclusion

Alloy N08811 is important in industrial applications due to its excellent performance in high temperature, high pressure and corrosive environments. Understanding its chemical composition, physical properties, areas of application and proper maintenance is essential to maximize the effectiveness of this high performance alloy. Through proper application and maintenance, N08811 alloy can provide long-term, consistent performance in challenging environments.

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