INCOLOY® Alloy 800H / 800HT – W. Nr. 1.4876, 1.4958, 1.4959 / UNS N08810 / N08811 / ASTM B409, B408, B564
INCOLOY® 800H / 800HT
INCOLOY® 800H / 800HT are nickel-iron-chromium alloys designed to offer high resistance to corrosion and high temperatures, while maintaining excellent creep and stress-rupture resistance properties. These alloys are an evolution of the traditional INCOLOY® 800, optimized to ensure superior performance in extreme conditions.
- INCOLOY® 800H (UNS N08810) is characterized by a carbon content between 0.05 – 0.10% and an ASTM grain size of 5 or coarser.
- INCOLOY® 800HT (UNS N08811) features a more controlled carbon content between 0.06 – 0.10% and a combined aluminum + titanium content between 0.85 – 1.20%, to optimize creep and rupture resistance properties.
Both alloys are ideal for high-temperature applications, such as ethylene production, heat exchangers, industrial furnace components, and chemical plants.
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Reference standards:
- ASTM B409 (plates and strips)
- ASTM B408 (rods and wires)
- ASTM B564 (flanges and forgings)
- ASME Code Case 1325, 1949, 1987 (pressure applications)
Chemical composition (%)
| Element | INCOLOY 800H | INCOLOY 800HT |
|---|---|---|
| Nickel (Ni) | 30.0 – 35.0 | 30.0 – 35.0 |
| Chromium (Cr) | 19.0 – 23.0 | 19.0 – 23.0 |
| Iron (Fe) | 39.5 min | 39.5 min |
| Carbon (C) | 0.05 – 0.10 | 0.06 – 0.10 |
| Aluminum (Al) | 0.15 – 0.60 | 0.25 – 0.60 |
| Titanium (Ti) | 0.15 – 0.60 | 0.25 – 0.60 |
| Al + Ti | 0.30 – 1.20 | 0.85 – 1.20 |
Mechanical properties
| Temperature (°C) | Tensile strength (MPa) | Yield strength (MPa) | Elongation (%) |
|---|---|---|---|
| 20 | 786 | 779 | 58 |
| 600 | 738 | 547 | 43 |
| 900 | 865 | 547 | 43 |
| 1000 | 724 | 544 | 50 |
Heat treatments
- Solution Annealing: 1149°C (minimum for 800HT) to ensure maximum creep and stress-rupture resistance.
- Rapid Cooling: To avoid sensitization to intergranular corrosion.
- Hot Forming: Temperature range between 870 – 1200°C, with rapid cooling to prevent chromium carbide precipitation.
Available forms
INCOLOY® Alloy 800H and 800HT are available in the following forms:
Industrial applications
Thanks to their high resistance to corrosion and high-temperature deformation, INCOLOY® 800H and 800HT are ideal for:
- Aerospace and Defense: Structural components for high-temperature industrial furnaces and plants.
- Power Generation: Heat exchangers and systems for power and nuclear plants.
- Chemical and Pharmaceutical Industry: Chemical reactor components, furnaces, and heat exchange systems.
- Motorsport: Exhaust systems for high-performance vehicles.
- Nuclear: Structural components for reactors and cooling systems.
- Oil & Gas: Piping and transport systems resistant to carburization and high temperatures
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