Incoloy 800HT (UNS N08811) Seamless Pipes & Tubes Manufacturer & Supplier
Alloy 800HT (Incoloy 800HT, UNS N08811) is an enhanced version of Alloy 800 with controlled carbon (0.06-0.10%) and higher combined Al+Ti content (0.85-1.20%). These controlled additions provide significantly higher creep-rupture strength, making it the premier choice for high-temperature furnace applications.
UNS: N08811 | Category: Nickel-Iron-Chromium Alloy | Werkstoff Nr: 1.4876 | EN Name: X10NiCrAlTi32-20
Size Range
Outer Diameter: 1/4" NPS to 10" NPS (6.35mm to 273.1mm OD)
Wall Thickness: SCH 5S to SCH 80S
Chemical Composition (%)
| Ni | Cr | Fe | C | Al | Ti | Al+Ti | Mn | Si |
|---|---|---|---|---|---|---|---|---|
| 30.0-35.0 | 19.0-23.0 | 39.5 min | 0.06-0.10 | 0.25-0.60 | 0.25-0.60 | 0.85-1.20 | 1.50 max | 1.00 max |
Mechanical Properties
- Tensile Strength
- 520 MPa min
- Yield Strength
- 205 MPa min
- Elongation
- 30% min
- Hardness
- N/A
Physical Properties
- Density
- 7.94 g/cm3
- Melting Range
- 1357-1385 C
- Thermal Conductivity
- 11.5 W/m-K
- Electrical Resistivity
- 989 nOhm-m
- Specific Heat
- 460 J/kg-K
- Coeff. of Thermal Expansion
- 14.4 um/m-C
Corrosion Resistance
- Pitting Resistance (PREN)
- N/A
- Max Service Temp (Oxidizing)
- 900 C (continuous)
- Intergranular Corrosion
- Good
- Stress Corrosion Cracking
- Good
- General Corrosion Rate
- Excellent in carburizing environments
- Seawater Resistance
- Good
Applicable Standards
- ASTM B407 / ASME SB407
- ASTM B163 / ASME SB163
- ASTM B514 / ASME SB514
- DIN 17751
Applications
- Ethylene pyrolysis furnace tubes
- Reformer tubes in hydrogen plants
- Industrial furnace components
- Radiant tubes and muffles
- Power plant superheaters
- Ammonia reformer tubes
Industries Served
- Petrochemical
- Hydrogen Production
- Power Generation
- Chemical Processing
- Fertilizer
Key Advantages
- Superior creep-rupture strength vs Alloy 800/800H
- Controlled Al+Ti for optimum grain boundary strengthening
- Excellent resistance to carburization and oxidation
- Proven in the most demanding furnace tube applications
- Long service life in ethylene cracker tubes
Equivalent Grades
- ASTM
- N08811
- Trade
- Incoloy 800HT
- DIN
- 1.4876 (H/HT)