1. What is Incoloy 800HT (UNS N08811) and what makes it suitable for high-temperature applications?
Answer:
Incoloy 800HT is a nickel-iron-chromium alloy designed for enhanced high-temperature strength and creep resistance.
Can operate in temperatures up to 1100°C (2012°F).
Resists oxidation, carburization, and thermal fatigue, making it ideal for furnace components, heat exchangers, and industrial heating systems.
Heat-treated version of Incoloy 800 provides improved mechanical properties over standard Incoloy 800.
2. What standards does Incoloy 800HT round bar conform to?
Answer:
ASTM B408: Standard specification for nickel-iron-chromium alloy bars and shapes for high-temperature service.
UNS N08811: Unique material designation for Incoloy 800HT.
These standards ensure consistent chemical composition, mechanical properties, and heat-resistance performance.
3. What sizes and forms are available for Incoloy 800HT round bars?
Answer:
Forms: Round bars, also available in custom shapes upon request.
Diameter: Typically 6 mm to 250 mm, with custom diameters available.
Length: Standard lengths 2 m to 6 m, cut-to-length options possible.
Bars are hot-rolled or forged, ensuring uniform metallurgical structure and excellent high-temperature performance.
4. What are the typical applications of Incoloy 800HT round bars?
Answer:
Industrial Heating: Furnace components, radiant tubes, and heat exchanger tubes.
Chemical and Petrochemical Industry: Equipment exposed to high-temperature corrosive environments.
Power Generation: Boiler components, heat recovery systems, and high-temperature piping.
Metallurgical Industry: Kilns, annealing, and sintering equipment requiring oxidation resistance and mechanical stability.
5. How should Incoloy 800HT round bars be stored and maintained?
Answer:
Store in dry, clean, and ventilated areas to prevent surface oxidation or contamination.
Avoid direct contact with halides or strong acids that may affect surface integrity.
Perform periodic inspections for scaling or surface deposits.
Maintain proper handling practices to prevent mechanical damage.
Heat treatment after forming may be applied to restore mechanical properties for high-temperature service.
