Alloy 800H UNS N08810: Properties, Applications, and Benefits
Alloy 800H (UNS N08810) is a nickel-iron-chromium superalloy renowned for its exceptional high-temperature strength, oxidation resistance, and outstanding creep rupture properties. This material is widely used in demanding industrial environments where reliability under thermal stress is critical.
Key Mechanical and Physical Properties
Alloy 800H offers excellent tensile and creep strength at elevated temperatures up to 1500°F (815°C). Its high nickel content provides resistance to chloride-ion stress-corrosion cracking, while chromium enhances oxidation and carburization resistance. The alloy maintains structural integrity in both oxidizing and reducing atmospheres, making it suitable for prolonged high-temperature service.
Industrial Applications
This superalloy is extensively utilized in heat treatment fixtures, industrial furnace components, and radiant tubes. It serves critical roles in petrochemical processing, nuclear steam generators, and power generation systems. Its stability makes it ideal for reformers, pyrolysis furnaces, and heat exchangers operating under extreme conditions.
Performance Advantages
The controlled carbon content in Alloy 800H UNS N08810 ensures superior creep rupture strength compared to standard Alloy 800. Its balanced composition delivers excellent resistance to sulfur attack, carburization, and internal oxidation. These characteristics translate to extended service life and reduced maintenance costs in high-temperature applications.
Frequently Asked Questions
Temperature Limitations
Alloy 800H performs reliably in continuous service up to 1500°F (815°C) and can withstand short-term exposure to 1800°F (980°C) depending on environmental conditions.
Welding and Fabrication
The alloy can be readily welded using matching filler metals and standard welding techniques, though post-weld heat treatment is recommended for optimized performance.
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