Alloy 800HT UNS N08811: Properties, Applications, and Performance Guide
Alloy 800HT UNS N08811 is a nickel-iron-chromium superalloy strengthened by titanium and aluminum additions. Known for its excellent strength and oxidation resistance at high temperatures, it is widely used in demanding industrial environments.
Key Properties of Alloy 800HT
This alloy offers outstanding creep and rupture strength up to 1500°F (815°C). Its high nickel content provides resistance to chloride stress corrosion cracking, while chromium enhances oxidation and carburization resistance.
Industrial Applications
Common uses include heat treatment fixtures, radiant tubes, and steam methane reformer components. It performs exceptionally well in petrochemical processing, nuclear systems, and thermal processing equipment.
Performance Advantages
Alloy 800HT maintains structural integrity under cyclic thermal conditions and prolonged exposure to aggressive atmospheres. Its stable austenitic structure prevents embrittlement during service.
Frequently Asked Questions
What distinguishes Alloy 800HT from other high-temperature alloys?
Its optimized titanium/aluminum ratio and carbon content provide superior creep rupture life compared to standard 800 series alloys.
Can Alloy 800HT withstand sulfur-containing environments?
Yes, it demonstrates good resistance to sulfidation, particularly in moderately oxidizing conditions.
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