Alloy 800HT UNS N08811: Properties, Applications, and Performance Characteristics
Alloy 800HT, also known by its UNS designation N08811, is a high-temperature, nickel-iron-chromium alloy renowned for its exceptional strength and oxidation resistance. This advanced material is widely utilized in demanding industrial environments where reliability and durability are critical.
Key Properties of Alloy 800HT
The outstanding performance of Alloy 800HT UNS N08811 stems from its optimized chemical composition. It contains approximately 33% nickel, 21% chromium, and balanced iron, with additions of titanium and aluminum for stabilization. This structure grants excellent creep rupture strength and carburization resistance up to 1500°F (815°C).
High-Temperature Mechanical Performance
Alloy 800HT maintains superior tensile and creep properties under prolonged exposure to extreme heat, making it ideal for applications in thermal processing and power generation industries.
Common Applications
This alloy is extensively used in furnace components, heat treatment trays, and radiant tubes. Its resistance to oxidation and carburization makes it suitable for petrochemical processing equipment and nuclear steam generators.
Industrial and Chemical Processing Uses
Industries leverage Alloy 800HT for piping systems, heat exchangers, and catalyst support grids in aggressive environments where lesser materials would fail.
Frequently Asked Questions
What distinguishes Alloy 800HT from other high-temperature alloys?
Its enhanced titanium and carbon content provide better stability and strength during long-term exposure to high temperatures compared to standard alloys.
Can Alloy 800HT be welded easily?
Yes, it exhibits good weldability using common techniques like GTAW and GMAW, though post-weld heat treatment is often recommended.
Performance in Extreme Conditions
Alloy 800HT demonstrates remarkable resistance to oxidation, sulfidation, and carburization, ensuring longevity and reduced maintenance costs in critical operations.
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