Here are five common questions and answers related to Alloy 800 Welded Tubing & ASTM B163 UNS N08800 Incoloy 800 Tube:
1. What is the composition of Incoloy 800 (UNS N08800)?
Answer:
Incoloy 800 (UNS N08800) is a nickel-iron-chromium alloy. Its typical composition includes:
Nickel (Ni): 30-35%
Chromium (Cr): 19-23%
Iron (Fe): Balance
Small amounts of Manganese (Mn), Copper (Cu), Silicon (Si), and Carbon (C).
This composition gives the alloy excellent resistance to oxidation, carburization, and high-temperature corrosion.
2. What are the primary applications of Alloy 800 welded tubing?
Answer:
Alloy 800 welded tubing is widely used in high-temperature applications where resistance to oxidation, carburization, and thermal cycling is essential. Its primary applications include:
Heat exchangers
Furnace components
Chemical processing equipment
Power plant components
Nuclear and petrochemical industries
3. What are the mechanical properties of Incoloy 800 tubing?
Answer:
Incoloy 800 tubing has the following typical mechanical properties:
Yield Strength (0.2% offset): 30,000 psi (205 MPa)
Tensile Strength: 70,000-90,000 psi (480-620 MPa)
Elongation in 2 inches (50 mm): 30%
Hardness: Typically HRB 80-90
These properties make it suitable for high-stress applications under extreme conditions.
4. How does Incoloy 800 perform in high-temperature environments?
Answer:
Incoloy 800 performs very well in high-temperature environments due to its excellent oxidation and carburization resistance. It can withstand temperatures up to 1100°F (593°C) in continuous service without significant degradation. This makes it ideal for applications involving heat cycles, such as furnace tubes, heat exchangers, and reactors in the chemical industry.
5. What are the advantages of using Alloy 800 welded tubing over other materials?
Answer:
The advantages of using Alloy 800 welded tubing over other materials include:
Superior High-Temperature Performance: It has excellent resistance to high-temperature oxidation and carburization, which is critical in furnace and reactor applications.
Corrosion Resistance: Alloy 800 provides resistance to a variety of corrosive environments, including acids and alkalis.
Good Fabricability: Incoloy 800 can be welded easily, making it ideal for fabricating welded tubes and components.
Long Service Life: Its ability to resist thermal cycling and thermal-fatigue cracking ensures longer service life in demanding applications.
Versatility: It performs well in both oxidizing and carburizing environments, making it highly versatile across various industries.
These qualities make it a popular choice for industries like chemical processing, power generation, and aerospace.
