UNS N08810, or Incoloy 800H pipe, is a nickel-iron-chromium alloy known for its enhanced high-temperature creep and stress-rupture strength due to its controlled high carbon, titanium, and aluminum contents. Its excellent resistance to oxidation, carburization, and sulfidation makes it an ideal choice for welded boiler tubes in demanding applications such as petrochemical plants, power plants, and high-temperature furnaces, while maintaining excellent mechanical properties.
Incoloy 800 has a lower carbon content, typically around 0.05%, while Incoloy 800H has a higher carbon content of 0.05-0.10%. The higher carbon content of 800H increases its strength, making it more suitable for high-temperature applications.
Uns N08810 Welded Nickel Alloy Boiler Tube Chemical Composition %
| B514 | Ni | Cr | FeA | Mn | C | Cu | Si | S | Al | Ti |
| NO8810 | 30.0-35.0 | 19.0-23.0 | 39.5min | 1.5max | 0.05-0.10 | 0.75max | 1.0 | 0.015 | 0.15-0.60 | 0.15-0.60 |
Uns N08810 Welded Nickel Alloy Boiler Tube Mechanical Property
| Condition (Temper) | Tensile Strength min | Yield Strength, 0.2% offset min | Elongation |
| annealed | 65000 psi,450 MPa | 25000 psi,170 MPa | 30% |
Key Features
Composition: A nickel-iron-chromium alloy with controlled additions of titanium and aluminum, and a higher carbon content than 800 alloy.
High-Temperature Strength: Improved creep and stress-rupture resistance enable reliable operation in high-temperature applications.
Corrosion Resistance: Excellent resistance to oxidation, carburization, and sulfidation, making it suitable for corrosive environments.
Stable Microstructure: The presence of titanium and aluminum stabilizes the microstructure at high temperatures, preventing harmful carbide precipitation during service.
Coarse-Grained Microstructure: High-temperature annealing and controlled composition result in a coarser grain size, resulting in superior high-temperature strength and stability.
Applications
Welded Incoloy 800H boiler tubes can be used in a variety of high-temperature and high-pressure environments, including:
Petrochemical Industry: Process equipment and furnace tubes.
Power Generation: Superheaters, reheaters, and heat exchangers.
Chemical Industry: Equipment for the production of various chemicals.
Heat Treatment: Fixtures, radiant tubes, and components for heat treatment furnaces.
Benefits
Durability: Maintains high tensile strength and creep-rupture properties at elevated temperatures.
Performance: Provides reliable performance and structural integrity in harsh environments.
Versatility: Suitable for a variety of high-temperature and corrosive industrial applications.
Gnee Steel specializes in the production and sale of various nickel-based alloys, including Nickel 201, Nickel 202, Hastelloy C-276, Hastelloy C-22, Hastelloy B, Hastelloy C-4, Inconel Alloy 600, Inconel 625, Inconel 718, Inconel X-750, Incoloy Alloy 800, Incoloy 800H/HT, Incoloy 825, Monel Alloy 400, Monel K500, and high-temperature alloys. Gnee Steel's products are widely used in aerospace, chemical, electric power, automotive, and nuclear energy applications. We also offer customized alloy solutions tailored to customer needs. For alloy pricing inquiries or customized alloy solutions, please contact us for a quote at ss@gneesteel.com.
