1. What are the differences between Incoloy 800, 800H, and 800HT bars?
Answer:
Incoloy 800: Standard alloy with good high-temperature strength and resistance to oxidation and carburization.
Incoloy 800H: Has a higher carbon content, providing increased creep and stress-rupture strength at elevated temperatures (up to ~700°C).
Incoloy 800HT: Heat-treated for maximum high-temperature strength and stability, suitable for long-term service in severe environments.
These variations allow selection based on specific temperature and mechanical requirements.
2. What applications are Incoloy 800/825 bars used for?
Answer:
Incoloy 800/800H/800HT: Heat exchangers, furnace components, chemical processing equipment, and petrochemical industry applications requiring high-temperature oxidation resistance.
Incoloy 825 (UNS N08825): Corrosion-resistant applications in chemical plants, seawater systems, pollution control, and acid handling.
Both alloys excel in environments where a combination of high strength and corrosion resistance is required.
3. What standards and specifications do these bars comply with?
Answer:
ASTM B408: Covers seamless nickel-iron-chromium alloy bars for high-temperature and corrosive environments.
UNS N08825 (Incoloy 825): Complies with UNS standards for chemical composition and mechanical properties.
Mechanical properties, chemical composition, and heat treatment processes are tested to ensure compliance with industry standards.
4. Can these Incoloy bars be machined and welded easily?
Answer:
Yes:
Machining: Standard machining techniques for austenitic alloys apply; tools must be sharp, and cutting speeds may need to be adjusted.
Welding: Alloys can be welded using compatible nickel-based filler metals. Incoloy 800 series requires careful heat control, while Incoloy 825 needs proper filler metals (e.g., Alloy 82/182) to maintain corrosion resistance.
5. Why choose ASTM B408 Incoloy bars for industrial applications?
Answer:
Excellent combination of high-temperature strength and corrosion resistance.
Durable in oxidizing, reducing, and acid environments.
Long service life reduces maintenance costs.
Available in multiple grades (800, 800H, 800HT, 825) to match specific temperature, corrosion, and mechanical requirements.
ASTM B408 ensures standardized quality and reliability for demanding industrial applications.
