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Alloy 800 / 800H / 800HT Technical Overview
Inconel 800 (UNS N08800) is a nickel-iron-chromium alloy with good strength and excellent resistance to oxidation and carburization in high-temperature exposure. Grade 800H (UNS N08810) and Grade 800HT (UNS N08811) are versions of 800 with controlled carbon content and grain size, specifically designed for improved creep-rupture properties at temperatures above 1100°F (600°C). The addition of aluminum and titanium in 800HT ensures higher strength at extreme heats. These alloys are widely used in chemical and petrochemical processing, power plants, and industrial furnaces. Steel Emporium stocks the complete 800 series in various pipe and tube dimensions.
Key Material Advantages
Creep Resistance
800H/800HT variants offer superior long-term creep-rupture strength.
Carburization Resistance
Excellent stability in carburizing and nitriding industrial atmospheres.
High Temp Strength
Maintains structural integrity up to 1500°F in most process environments.
| Grade | Ni | Cr | Fe | C | Al | Ti | Si | Mn | Cu |
|---|---|---|---|---|---|---|---|---|---|
| 800 | 30-35 | 19-23 | 39.5 min | 0.10 max | 0.15-0.6 | 0.15-0.6 | 1.0 max | 1.5 max | 0.75 max |
| 800H | 30-35 | 19-23 | 39.5 min | 0.05-0.10 | 0.15-0.6 | 0.15-0.6 | 1.0 max | 1.5 max | 0.75 max |
| 800HT | 30-35 | 19-23 | 39.5 min | 0.06-0.10 | 0.25-0.6 | 0.25-0.6 | 1.0 max | 1.5 max | 0.75 max |
| Grade | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) |
|---|---|---|---|
| Alloy 800 (Annealed) | 520 MPa | 205 MPa | 30% min |
| Alloy 800H / 800HT | 450 MPa | 170 MPa | 30% min |
| Property | Value |
|---|---|
| Density | 7.94 g/cm³ (0.287 lb/in³) |
| Melting Range | 1357 - 1385 °C (2475 - 2525 °F) |
| Specific Heat | 460 J/kg·°C (0.11 Btu/lb·°F) |
| Electrical Resistivity | 0.989 µΩ·m |
| Standard | UNS Number | Werkstoff No. | EN Designation |
|---|---|---|---|
| Inconel 800 | N08800 | 1.4876 | X10NiCrAlTi32-20 |
| Inconel 800H | N08810 | 1.4958 | X5NiCrAlTi31-20 |
| Inconel 800HT | N08811 | 1.4959 | X8NiCrAlTi32-21 |
| Nominal Size (NB) | OD (mm) | SCH 10 | SCH 40 | SCH 80 |
|---|---|---|---|---|
| 1/2" | 21.34 | 1.26 | 1.61 | 2.10 |
| 1" | 33.40 | 2.07 | 3.22 | 4.22 |
| 2" | 60.33 | 3.91 | 5.41 | 7.45 |
| 4" | 114.30 | 11.00 | 16.03 | 22.25 |
| 6" | 168.28 | 16.20 | 28.15 | 42.45 |
Industrial Applications
Petrochemical
Piping systems for steam/hydrocarbon reforming.
Furnace Parts
Radiant tubes and heat treating muffles.
Power Generation
Super-heater and re-heater tubing in power plants.