Alloy 800 INCOLOY® 800 – W. Nr. 1.4876 / UNS N08800 / ASTM B408, B409, B564
Alloy 800 INCOLOY® 800
Alloy 800 INCOLOY® 800 is a nickel-iron-chromium alloy designed to offer excellent resistance to corrosion and oxidation at high temperatures. Originally developed in the 1950s, this alloy is widely used for its structural stability up to 1,500°F (816°C) and its resistance to oxidation, carburization, and other types of high-temperature corrosion.
Thanks to its composition, INCOLOY® 800 also offers good corrosion resistance in aqueous environments, particularly against chloride stress-corrosion cracking. Its primary use is in high-temperature industrial applications, such as furnaces, heat exchangers, and piping for the chemical and petrochemical industries.
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This alloy is regulated by several international standards, including:
- ASTM B408 (rods and wires)
- ASTM B409 (plates and strips)
- ASTM B564 (flanges and forgings)
Chemical composition (%)
| Element | Content (%) |
|---|---|
| Nickel (Ni) | 30.0 – 35.0 |
| Chromium (Cr) | 19.0 – 23.0 |
| Iron (Fe) | 39.5 min |
| Carbon (C) | 0.10 max |
| Manganese (Mn) | 1.50 max |
| Sulfur (S) | 0.015 max |
| Silicon (Si) | 1.0 max |
| Copper (Cu) | 0.75 max |
| Aluminum (Al) | 0.15 – 0.60 |
| Titanium (Ti) | 0.15 – 0.60 |
| Al + Ti | 0.30 – 1.20 |
Mechanical properties
| Temperature (°C) | Tensile strength (MPa) | Yield strength (MPa) | Elongation (%) |
|---|---|---|---|
| 20 | 596 | 262 | 30 |
| 600 | 450 | 176 | 25 |
| 800 | 369 | 149 | 22 |
| 1000 | 319 | 124 | 18 |
Heat treatments
- Standard annealing: 980–1,100°C followed by air cooling.
- Stabilization treatment: 870–980°C to improve intergranular corrosion resistance.
- Rapid cooling: Necessary to avoid chromium carbide precipitation, improving intergranular corrosion resistance.
Available forms
INCOLOY® Alloy 800 is available in the following forms:
Industrial applications
Thanks to its exceptional high-temperature properties and corrosion resistance, INCOLOY® 800 is used in critical sectors such as:
- Aerospace and Defense: Components for turbines and exhaust systems.
- Power Generation: Heat exchangers and piping in thermal power plants.
- Chemical and Pharmaceutical Industry: Equipment for cracking processes and reactors.
- Motorsport: High-performance exhaust systems.
- Nuclear: Piping for steam generators.
- Oil & Gas: Components for furnaces and refining plants.
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