1. What is the chemical composition of Incoloy 800H (UNS N08811)?
Answer:
Nickel (Ni): 38–46%
Iron (Fe): 32–39%
Chromium (Cr): 19–23%
Minor elements: Carbon 0.05–0.10%, Manganese ≤1%, Silicon ≤1%, Copper ≤0.5%
This combination provides excellent resistance to high-temperature oxidation and corrosion.
2. What is the difference between Incoloy 800 and Incoloy 800H?
Answer:
Incoloy 800H is a high-temperature version of Incoloy 800, with increased carbon content (0.05–0.10%).
This allows enhanced creep and stress-rupture resistance at elevated temperatures (up to 700–800°C).
Suitable for long-term high-temperature service where Incoloy 800 may soften.
3. What are the typical mechanical properties of Incoloy 800H round rods/pipes?
Answer (annealed condition, typical):
Tensile Strength: 550–750 MPa
Yield Strength: 220–300 MPa
Elongation: 30–45%
Hardness (HRB): 95 max
These properties make it suitable for structural and high-temperature piping applications.
4. What applications are suitable for Incoloy 800H?
Answer:
Heat exchangers, furnace components, and boiler tubes
Chemical and petrochemical process equipment
Nuclear industry components
Piping and rods in high-temperature corrosive environments
It is ideal where oxidation resistance and strength at elevated temperatures are required.
5. What does DIN W. Nr. 1.4876 standard indicate for this alloy?
Answer:
DIN W. Nr. 1.4876 is the German steel designation for Incoloy 800H/800HT.
It ensures the material meets chemical composition, mechanical properties, and heat treatment requirements for high-temperature nickel alloys.
Compliance guarantees international compatibility and reliability in engineering applications.
