High-temperature Incoloy 800H superheater tubes
Incoloy 800H superheater tubes are a nickel-iron-chromium alloy designed for high-temperature applications due to their exceptional strength, oxidation resistance, and creep resistance. Key properties include the ability to withstand temperatures up to 1100°F (593°C) and above, resistance to carburization and corrosion, and good weldability and thermal fatigue resistance, making them ideal for use in power plants and other harsh industrial environments. The 800HT version incorporates titanium and aluminum for further high-temperature stability and creep strength.
At what temperature does 800 alloy creep?
1100°F
800H alloy exhibits good creep-rupture properties at temperatures above 600°C (1100°F). Due to its titanium and aluminum contents up to 0.7%, it maintains good ductility for extended service at temperatures below 700°C (1290°F). Standard annealed 800 alloy is recommended for use below 600°C (1100°F).
Alloy 800H (UNS N08810) Piping Chemical Composition, %
| Ni | Cr | Fe | C | Al | Ti | Al+Ti |
|---|---|---|---|---|---|---|
| 30.0-35.0 | 19.0-23.0 | 39.5 min | .05-.10 | .15-.60 | .15-.60 | .30-1.20 |
High-temperature Incoloy 800H superheater tubes Applications
Power Generation: Used in superheater and reheater piping in power plants.
Petrochemical Processing: Used in heat exchangers and various processing equipment commonly exposed to high-temperature and corrosive environments.
Chemical Processing: Used in applications requiring resistance to corrosive chemical environments.
Aerospace: Used in components such as exhaust systems and gas turbine engine parts.
Heat Treatment: Used in equipment such as baskets, trays, and fixtures for heat treatment equipment.
Incoloy Alloy 800H Round Tubes Sizes
| Tube WT milimeter | Sch | inch | OD milimeter | Kg/m |
|---|---|---|---|---|
| 3.091 | 80S | 3/4 | 26.067 | 2.023 |
| 2.077 | 10S | 1 | 33.040 | 2.013 |
| 3.038 | 40S | 1 | 33.040 | 2.054 |
| 4.055 | 80S | 1 | 33.040 | 3.029 |
| 6.0352) | 160 | 1 | 33.040 | 4.030 |
| 2.077 | 10S | 1¼ | 42.016 | 2.073 |
| 3.056 | 40S | 1¼ | 42.016 | 3.044 |
| 4.085 | 80S | 1¼ | 42.016 | 4.053 |
| 6.0352) | 160 | 1¼ | 42.016 | 5.069 |
| 2.077 | 10S | 1½ | 48.026 | 3.016 |
| 1.065 | 10S | 1/4 | 13.072 | 0.050 |
| 2.024 | 40S | 1/4 | 13.072 | 0.064 |
| 3.002 | 80S | 1/4 | 13.072 | 0.081 |
| 1.065 | 10S | 3/8 | 17.015 | 0.064 |
| 2.031 | 40S | 3/8 | 17.015 | 0.086 |
| 3.020 | 80S | 3/8 | 17.015 | 1.012 |
| 2.011 | 10S | 1/2 | 21.034 | 1.002 |
| 2.077 | 40S | 1/2 | 21.034 | 1.029 |
| 3.073 | 80S | 1/2 | 21.034 | 1.065 |
| 2.011 | 10S | 3/4 | 26.067 | 1.030 |
| 2.087 | 40S | 3/4 | 26.067 | 1.071 |
Incoloy 800H Tube Mechanical Properties
| Alloy | Condition (Temper) | Tensile Strength min psi (MPa) |
Yield Strength (0.2 % offset) min psi (MPa) | Elongation in 2 in. or 50mm (or 4D), min,% |
| UNS N08810 | hot-finished annealed or cold-worked annealed | 65 000 (450) | 25 000 (170) | 30 |
Advantages of Incoloy 800H Tube
|
Property |
Advantages of Incoloy 800H |
Application in Convection Tubes |
|
High-Temperature Strength |
excellent creep and stress-rupture resistance |
Withstands the impact of high-temperature cracking furnace flue gases, preventing pipe deformation or cracking under long-term high-temperature conditions. |
|
Corrosion Resistance |
Excellent resistance to oxidation, carburization, and sulfidation; resistant to nitric acid and organic acids |
Resists corrosion from acidic media, water vapor, carbon dioxide mixtures, and sulfur-containing flue gases generated during the cracking process. |
|
Microstructural Stability |
Ti/Al stabilization treatment inhibits carbide precipitation and sensitization, reducing the risk of intergranular corrosion. |
Ensures stable performance even after long-term use in the sensitive temperature range of 593-816°C. |
|
Processing and Welding |
Excellent hot workability and weldability |
Facilitates fabrication, installation, and subsequent maintenance of convection tube module |
Gnee Steel specializes in the production and sale of various nickel-based alloys, including Nickel 201, Nickel 202, Hastelloy C-276, Hastelloy C-22, Hastelloy B, Hastelloy C-4, Inconel Alloy 600, Inconel 625, Inconel 718, Inconel X-750, Incoloy Alloy 800, Incoloy 800H/HT, Incoloy 825, Monel Alloy 400, Monel K500, and high-temperature alloys. Gnee Steel's products are widely used in aerospace, chemical, electric power, automotive, and nuclear energy applications. We also offer customized alloy solutions tailored to customer needs. For alloy pricing inquiries or customized alloy solutions, please contact us for a quote at ss@gneesteel.com.
