1. What is the chemical composition of Incoloy 800H (N08811)?
Answer: Incoloy 800H is a nickel-iron-chromium alloy, typically composed of 30–35% Ni, 19–23% Fe, 39–43% Cr, along with small amounts of titanium and aluminum. This composition provides excellent high-temperature strength and oxidation resistance.
2. What are the main applications of Incoloy 800H round bars?
Answer: Incoloy 800H bars are used in furnace components, heat exchangers, chemical processing equipment, boiler parts, and gas turbines. They are particularly suitable for high-temperature applications where thermal stability and corrosion resistance are required.
3. What are the mechanical properties of Incoloy 800H rods?
Answer: Incoloy 800H exhibits high tensile strength (~515–690 MPa), excellent creep and stress-rupture resistance at temperatures up to 1100℃F–1500℃F (600–815℃), and good elongation (~30–40%). It maintains its properties under thermal cycling and corrosive environments.
4. How does Incoloy 800H perform under high-temperature corrosion conditions?
Answer: Incoloy 800H has excellent oxidation and carburization resistance at elevated temperatures. It performs well in oxidizing environments, flue gases, and certain chemical atmospheres, making it superior to standard nickel-chromium alloys for long-term high-temperature service.
5. What should be considered when machining, welding, or installing Incoloy 800H bars?
Machining requires sharp tools and slower speeds due to its work-hardening tendency.
Welding should use matching nickel-chromium filler metals and avoid overheating to preserve strength.
Surface preparation is important to prevent oxidation or scaling.
Ensure proper thermal expansion allowances in high-temperature installations to avoid stress cracking.
