incoloy 800ht chemical composition
incoloy 800ht chemical composition
Incoloy 800HT is a high-carbon, titanium-aluminum stabilized upgrade of the Incoloy 800 series. Its core characteristic is the precise control of carbon, aluminum, and titanium content, providing optimal creep resistance, carburization resistance, and high-temperature oxidation resistance at temperatures up to approximately 815°C, while also possessing extremely high high-temperature strength and long-term stability. It is specifically designed for extreme environments requiring long-term exposure to high temperatures, high pressures, and thermal cycling, such as petrochemical cracking furnace tubes, industrial heaters, high-temperature heat exchangers, and nuclear power plant steam generators. It is particularly suitable for critical applications involving high-temperature stress rupture and creep, making it a top-tier alloy choice for high-temperature pressure-bearing components.
What is INCOLOY 800HT?
Incoloy 800HT is a nickel-iron-chromium alloy and an improved version of the 800 alloy. It possesses high creep rupture strength.
800HT alloy/Incoloy 800HT is a compositionally controlled derivative alloy of INCOLOY 800H alloy (UNS N08810), used in the same creep-resistant applications. However, the combined effects of its mechanical processing and heat treatment allow it to withstand higher design stresses than conventional alloys.
Chemical composition of nickel alloy 800HT and Incoloy 800HT
| Element | Content Range / Limit |
|---|---|
| Aluminum (Al) | 0.2 % max |
| Carbon (C) | 0.05 % max |
| Chromium (Cr) | 19.5 – 23.5 % |
| Copper (Cu) | 1.5 – 3.0 % |
| Iron (Fe) | 22.0 % min |
| Manganese (Mn) | 1.0 % max |
| Molybdenum (Mo) | 2.5 – 3.5 % |
| Nickel (Ni) | 38.0 – 46.0 % |
| Sulfur (S) | 0.03 % max |
| Silicon (Si) | 0.5 % max |
| Titanium (Ti) | 0.6 – 1.2 % |
Key properties of Incoloy 800HT
| Tensile strength: | 54.00–77.00 |
| Yield strength: | 13.00–21.00 |
| Elongation: | 18.00–23.00% |
Key Elements (Typical Composition)
Nickel (Ni): 30.0 - 35.0%
Chromium (Cr): 19.0 - 23.0%
Iron (Fe): Minimum 39.5%
Carbon (C): 0.06 - 0.10%
Aluminum (Al): 0.25 - 0.60%
Titanium (Ti): 0.25 - 0.60%
Aluminum + Titanium (Al+Ti): 0.85 - 1.20%
Other Elements (Maximum Content)
Manganese (Mn): Maximum 1.50%
Silicon (Si): Maximum 1.00%
Copper (Cu): Maximum 0.75%
Sulfur (S): Maximum 0.015%
Main Characteristics
Strengthening: Controlled carbon, aluminum, and titanium content, combined with a specific high-temperature annealing process, gives Alloy 800HT excellent creep rupture strength.
Corrosion Resistance: High nickel and chromium content provides excellent resistance to oxidation, carburization, and sulfidation, making it ideal for harsh industrial environments.
Identification: Also known as UNS N08811, it is an upgraded version of Alloy 800, designed to provide higher strength at extremely high temperatures.
Why Choose Gnee as Your Nickel-Based Alloy Supplier
✅ Over 18 years of export experience, products sold to more than 80 countries
✅ Certified by ISO, SGS, and BV
✅ Global inventory of Inconel, Hastelloy, Incoloy, and Monel alloy tubing, plates, and bars
✅ Custom processing services available – including cutting, polishing, CNC machining, and packaging
✅ Fast delivery within 7-15 days, supported by global logistics partners
📦 Packaging and Shipping
All stainless steel products are packaged using the following methods:
Wooden pallets or crates
Moisture-proof packaging
Labels with furnace number, standard, and size labels
Shipped worldwide by sea, air, or express
Gnee Steel also supplies custom incoloy 800HT products in various sizes and specifications. Please send us your drawings for a quote!
