Incoloy 800HT (UNS N08811) Seamless Pipes & Tubes
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.
Size Range
1/4" NPS to 10" NPS (6.35mm to 273.1mm OD)
Wall Thickness
SCH 5S to SCH 80S
Standards
4 specs
Chemical Composition (% by weight)
| 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 (Minimum at Room Temperature)
| Tensile Strength | Yield Strength | Elongation | Hardness |
|---|---|---|---|
| 520 MPa min | 205 MPa min | 30% min | N/A |
Physical Properties - Alloy 800HT
| Density | Melting Range | Thermal Conductivity | Electrical Resistivity | Specific Heat | Coeff. of Thermal Expansion |
|---|---|---|---|---|---|
| 7.94 g/cm3 | 1357-1385 C | 11.5 W/m-K | 989 nOhm-m | 460 J/kg-K | 14.4 um/m-C |
Corrosion Resistance - Alloy 800HT
| Property | Value |
|---|---|
| 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 |
Equivalent International Grades
| ASTM | Trade | DIN |
|---|---|---|
| N08811 | Incoloy 800HT | 1.4876 (H/HT) |
Alloy 800HT vs Comparable Grades
| Grade | UNS | Tensile | Yield | PREN | Max Temp |
|---|---|---|---|---|---|
| Alloy 800Nickel-Iron-Chromium Alloy | N08800 | 520 MPa min | 205 MPa min | N/A | 815 C |
| Alloy 600Nickel Alloy | N06600 | 550 MPa min | 240 MPa min | N/A (Ni alloy) | 1175 C |
| Alloy 601Nickel Alloy | N06601 | 550 MPa min | 205 MPa min | N/A (Ni alloy) | 1250 C |
Applicable Standards
Applications
Key Advantages of Alloy 800HT
Alloy 800HT Applications by Region
Middle East (UAE, Saudi Arabia, Qatar, Oman, Kuwait)
Premium grade for ethylene cracker tubes and reformer applications in SABIC, Qatar Petrochemical, and UAE facilities.
Europe (Germany, UK, Norway, Netherlands, Italy)
Standard for ethylene and hydrogen production furnace tubes in Netherlands, Germany, and UK.
United States
Specified for ethylene pyrolysis, hydrogen reforming, and high-temperature industrial processes.
Frequently Asked Questions about Alloy 800HT Seamless Pipes
Quick Specifications
1/4" NPS to 10" NPS (6.35mm to 273.1mm OD)
SCH 5S to SCH 80S
Industries Served
Related Grades
Ready to Order Alloy 800HT Seamless Pipes?
Stancor is India's leading manufacturer of Alloy 800HT seamless pipes, exporting to UAE, Saudi Arabia, Qatar, Germany, UK, and USA. Contact our sales team for competitive pricing, fast delivery, and full material certification.