Incoloy 800HT (UNS N08811 / W.Nr. 1.4959)
Incoloy 800HT (UNS N08811 / W.Nr. 1.4959) nickel-iron-chromium alloys that have the same basic composition as INCOLOY alloy 800 but with significantly higher creep-rupture strength. The higher strength results from close control of the carbon, aluminum and titanium contents in conjunction with a high temperature anneal. Used in chemical and petrochemical processing, power plants for super-heater and reheater tubing, industrial furnaces and heat-treating equipment.
Equivalent Grades
| Trademark | GB | GOST | ASTM | UNS | DIN | W.Nr. | NF | BS | JIS | SS |
| Incoloy 800HT | NS1102
NS112 | – | Incoloy 800HT | N08811 | X10NiCrAlTi32-20 | 1.4959 | – | NA15H | – | – |
Chemical Composition, %
| Alloy | C | Si | Mn | P | S | Cr | Ni | Al+Ti | Ti | Fe |
| Incoloy 800HT | 0.06-0.10 | ≤0.10 | ≤3.00 | ≤0.03 | ≤0.02 | 19.0-23.0 | 30.0-35.0 | 0.25-1.20 | 0.15-0.60 | ≥39.5 |
Typical Physical and Mechanical Properties (RT, Solution annealed)
| Density, g/cm3 | Melting Point, ℃ | Tensile Strength, MPa | Yield Strength, MPa | ELongation, % | Hardness, HB |
| 8.00 | 1357-1375 | 531 | 200 | 52 | – |
Available Products and Specifications
| Rod, Bar, Wire and Forgings | ASTM B408/ASME SB408, ASTM B564/ASME SB564, ISO 9723/9724/9725 |
| Plate, Sheet and Strip | ASTM A240/A480/B409/B906/ASME SA240/SA480/SB409/SB906, ISO 6208 |
| Pipe and Tube | ASTM B163/ASME SB163, ASTM B407/B829/ASME SB407/SB829, ASTM B514/B775/ASME SB514/SB775, ASTM B515/B751/ASME SB515/SB751, ISO 6207 |
| Welding Product | – |
| Others | ASTM B366/ASME SB366(Fittings) |
Features
- Resistance to prolonged exposure to elevated temperatures
- Excellent resistance to oxidation, sulfidation, and carburization
- Added Carbon and annealing treatment allows for higher creep and rupture properties above 600℃
- Resistant to high temperature corrosion
- Readily machined by standard methods
- Best joined/welded using products for high temperature situations
- Resistance to aqueous corrosion at moderate temperatures
Applications
- Chemical and Petrochemical Processing—process equipment for the production of ethylene, ethylene dichloride, acetic anhydride, ketene, nitric acid and oxy-alcohol
- Petroleum Refining—steam/hydrocarbon reformers and hydrodealkylation units
- Power Generation—steam super-heaters and high temperature heat exchangers in gas-cooled nuclear reactors, heat exchangers and piping systems in coal-fired power plants
- Thermal Processing Fixtures—radiant tubes, muffles, retorts and fixtures for heat-treating furnaces
