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Nickel Alloy 800HT | UNS N08811 | 1.4959 | Incoloy 800HT
| MOQ: | 5Ton |
| Price: | Based on grade, size, surface, processing, quantity and current raw material market price. |
| Standard Packaging: | Standard seaworthy export packing with bundles, waterproof wrapping, pallets or wooden cases. |
| Delivery Period: | 7-15 |
| Payment Method: | L/C,D/A,D/P,T/T,Western Union |
| Supply Capacity: | Stock supply, regular production and custom manufacturing available. |
Nickel Alloy 800HT | UNS N08811 | 1.4959 | Incoloy 800HT
Shaanxi Shangyou Stainless Steel Co., Ltd. supplies Nickel Alloy 800HT, also known as Incoloy 800HT, identified as UNS N08811 and Werkstoff 1.4959, in plate, sheet, strip, round bar, rod, seamless and welded tubing, pipe, and forging forms. Our Alloy 800HT products can be supplied according to ASTM B409 / ASME SB-409 for plate, sheet and strip; ASTM B408 / ASME SB-408 for bar and wire; ASTM B407 / ASME SB-407 for seamless pipe and tube; and ASTM B564 / ASME SB-564 for forgings.
Nickel Alloy 800HT is the highest-performance member of the 800 series nickel-iron-chromium alloy family. It is developed from Alloy 800H (UNS N08810) through tighter control of aluminum (Al) and titanium (Ti) content, with a prescribed Al+Ti total range of 0.85-1.20%. Combined with a high-temperature solution annealing treatment producing an average grain size of ASTM 5 or coarser, this controlled chemistry delivers the highest creep rupture strength in the 800 series, particularly at temperatures above 700°C (1290°F). The alloy utilizes a composite strengthening mechanism of coarse austenitic grains, grain boundary carbide pinning, and fine γ' phase (Ni3(Al,Ti)) precipitation within grains.
| Item | Supply Information |
|---|---|
| Alloy Grade | Nickel Alloy 800HT / Incoloy 800HT |
| UNS Number | N08811 |
| EN / Werkstoff Number | 1.4959 |
| EN Material Name | X8NiCrAlTi32-21 |
| Plate / Sheet / Strip Standard | ASTM B409 / ASME SB-409, AMS 5871 |
| Bar / Rod / Wire Standard | ASTM B408 / ASME SB-408, AMS 5766 |
| Seamless Pipe / Tube Standard | ASTM B407 / ASME SB-407 |
| Forgings Standard | ASTM B564 / ASME SB-564 |
| Welded Tube Standard | ASTM B515 / ASME SB-515 |
| Product Forms | Plate, sheet, strip, round bar, rod, seamless pipe, welded pipe, tubing, forgings |
| Supply Condition | Solution annealed (high temperature) |
| Surface | Pickled, peeled, ground, polished or machined |
| Testing | Chemical analysis, tensile, hardness, PMI, and dimensional inspection |
| Inspection Documents | EN 10204 3.1 MTC; third-party inspection optional |
| Processing | Cutting, turning, milling, drilling and machining |
| Property | Typical Reference |
|---|---|
| Density | 7.94 – 8.0 g/cm3 |
| Melting Range | 1,350 – 1,400°C (approx. 1,385°C) |
| Modulus of Elasticity | ~196 – 200 GPa at 20°C |
| Thermal Conductivity | ~11.5 W/m-K |
| Coefficient of Expansion (20-100°C) | ~14.4 µm/m-°C |
| Tensile Strength, Annealed | 600 – 800 MPa (87 – 116 ksi) |
| Yield Strength (0.2%), Annealed | 180 – 240 MPa (min ~26 ksi) |
| Elongation, Annealed | ≥ 30% |
| Grain Size | ASTM 5 or coarser |
| Maximum Service Temperature | Up to ~1,100°C (2,010°F) for oxidation; optimal creep performance above 700°C |
| Heat Treatment | Solution annealed at ~1,120°C followed by rapid cooling |
| Available Forms | Plate, sheet, strip, round bar, rod, seamless pipe, welded pipe, tubing, forgings |
| Product Standards | ASTM B407, B408, B409, B564; ASME SB-407, SB-408, SB-409, SB-564; AMS 5766, AMS 5871 |
Actual properties depend on product form, dimensions, heat-treatment cycle, and the specified ASTM, ASME or AMS standard.
Alloy 800HT receives a high-temperature solution annealing treatment at approximately 1,120°C (2,050°F) followed by rapid cooling. This treatment produces an average grain size of ASTM 5 or coarser, which is essential for achieving the alloy's highest creep and rupture strength at temperatures above 700°C. The precise control of Al+Ti content (0.85-1.20%) combined with the coarse-grained microstructure gives 800HT its superior high-temperature properties.
Unlike standard Alloy 800 (recommended for service below 600°C), Alloy 800HT is specifically designed for applications requiring maximum creep rupture strength above 700°C. For applications involving frequent temperature excursions below 700°C, Alloy 800H is recommended to avoid ductility loss from γ' precipitation.
Alloy 800HT provides excellent resistance to high-temperature corrosion, oxidation, and carburization.
- Excellent oxidation resistance up to approximately 1,100°C (2,010°F)
- Superior resistance to carburization in high-temperature carbon-rich atmospheres, far superior to 310S stainless steel
- Good resistance to nitriding and sulfur-containing atmospheres
- Resistance to alternating oxidizing and reducing conditions
- Good chloride stress-corrosion cracking resistance due to high nickel content
- Metallurgical stability during prolonged high-temperature service
- For optimal creep performance, use above 700°C; for frequent thermal cycling below this temperature, consider Alloy 800H instead
- Not designed for aqueous strong acid service (inadequate pitting resistance due to no molybdenum)
- For higher oxidation requirements above 1,100°C, consider INCONEL 617 or Haynes 282
- Final selection must consider the specific medium, temperature, and exposure conditions
- Chemical and Petrochemical Processing: Ethylene furnace quench boilers, hydrocarbon cracking equipment, steam/hydrocarbon reformers
- Petroleum Refining: Hydrodealkylation units, reformer tubing, valves and fittings
- Power Generation: Steam superheaters, high-temperature heat exchangers, superheater and reheater tubing
- Thermal Processing: Industrial furnace radiant tubes, muffles, retorts, heat-treating fixtures
- Waste Incineration: Combustion chamber components
Available quality-control services include:
- Heat-number traceability
- Chemical composition verification
- Tensile, yield and elongation testing
- Hardness inspection
- Dimensional and surface inspection
- Positive Material Identification (PMI)
- Ultrasonic testing
- Dye penetrant inspection
- Heat-treatment records
- EN 10204 3.1 material certificate
For an accurate quotation, please provide:
Alloy Grade · Standard · Product Form · Dimensions · Quantity · Heat Treatment · Inspection Requirement · Application · Working Temperature · Destination Port
For high-temperature environments, also provide:
Operating Temperature · Cyclic Heating Requirements · Atmosphere Conditions (Oxidizing/Reducing/Carburizing)
- Request Nickel Alloy 800HT Quote
- Upload Drawing or MTO
- Check Available Stock
- Ask for Alloy Selection Support
Nickel Alloy 800HT (UNS N08811), also known as Incoloy 800HT, is the highest-performance nickel-iron-chromium alloy in the 800 series, with tightly controlled Al+Ti content (0.85-1.20%) for maximum creep rupture strength above 700°C.
