Nickel Alloy 800
UNS N08800/N08810/N08811
Alloy 800, 800H and 800HT are nickel-iron-chromium alloys developed for high-temperature service where strength and resistance to carburization and oxidation are required. They were designed to perform reliably in environments exposed to elevated temperatures and aggressive atmospheres.
These alloys are the result of decades of development: Alloy 800 was introduced in the 1950s as a heat- and corrosion-resistant alloy with relatively low nickel content. Alloy 800H followed with a higher carbon content, and Alloy 800HT was further refined by tightening the carbon range and increasing the combined aluminium and titanium content to improve creep strength at high temperatures.
Key Characteristics
- Nickel-iron-chromium alloys with high strength at elevated temperatures
- Excellent resistance to carburization and oxidation
- Very good corrosion resistance, including:
- Resistance to chloride stress-corrosion cracking
- Resistance to embrittlement from sigma-phase precipitation
- Alloy 800H and 800HT offer:
- Superior creep and stress-rupture properties compared with Alloy 800 (solution-annealed condition)
- Alloy 800HT maintains toughness and strength after prolonged exposure to 1200–1600 °F (650–870 °C)
- Good hot and cold workability
Fast, Flexible, Global Delivery
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Product Details
Applications – by service and function
High-temperature service up to and above 1100 °F:
- Alloy 800: mainly used up to 1100 °F
- Alloy 800H / 800HT: used above 1100 °F where higher creep and fracture resistance are required
Equipment exposed to:
- Carburizing atmospheres
- Oxidizing atmospheres
- Nitriding atmospheres
Heat treatment equipment, including:
- Baskets
- Trays
- Fixtures
Heat exchangers and piping systems in high-temperature and corrosive environments
Applications – by industry
- Chemical processing industry
- Petrochemical processing industry
- Nuclear power generation
- Pulp and paper industry
- Heat treatment and thermal processing facilities
Standards and Specifications
| Product | Standard | Grade / Notes |
|---|---|---|
| Seamless tubing | ASTM B407 | Alloy 800, 800H, 800HT; stock range ½” through 8″ |
Stainalloy Capabilities
- Products are extensively tested to meet leading international material specifications
- Dedicated logistics hub with trained warehouse personnel
- Possibility to upgrade materials to specific client requirements
- Stock of seamless Alloy 800 tubing from ½” through 8″
- Materials sourced from reputable mills and supplied in accordance with ASTM B407
- All elements in place for controlled and reliable delivery
Rowan de Visser
Senior Sales Engineer
Germán Gómez
Head of Stock Sales
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