Incoloy 800HT UNS N08811 bright nickel alloy tube
Incoloy 800HT tubing (UNS N08811) is a nickel-iron-chromium alloy tubing with excellent high-temperature strength and resistance to oxidation, carburization, and corrosion, making it particularly suitable for corrosive environments such as those found in the petrochemical and power generation industries. The "HT" designation indicates enhanced creep and rupture strength, achieved through controlled carbon, aluminum, and titanium content and a specialized high-temperature annealing process. Incoloy 800HT tubing is suitable for use in superheaters, furnace tubes, and other high-temperature equipment where structural integrity is critical in applications involving prolonged high-temperature environments.
What is the chemical composition of ASTM B407 UNS No. 8811?
ASTM B407 alloy is composed of nickel, iron, and chromium. This specification generally applies to seamless pipe and covers Incoloy 800 and Incoloy H/HT. It generally covers seamless ASME SB 407 pipe, either hot-finished or cold-finished.
Key Features and Composition of Incoloy 800HT Bright Finish Tubing
High-Temperature Strength: Incoloy 800HT exhibits exceptional creep rupture strength, making it well-suited for long-term exposure to extreme temperatures.
Corrosion Resistance: It exhibits excellent resistance to high-temperature corrosion, oxidation, carburization, and stress corrosion cracking in a variety of acidic and alkaline media.
Controlled Composition: The alloy's unique properties stem from its nickel-iron-chromium base, carefully controlled by the carbon, aluminum, and titanium content.
Specifications for Incoloy Alloy 800HT/825 Seamless Pipes, Alloy 800HT/825 Tubing's, UNS N08800, UNS N08825
| Seamless Pipe / Tubing | Welded Pipe / Tubing | |
| Incoloy 800 | ASTM B 407 / 163 | ASTM B 514 / 515 |
| ASME SB 407 / 163 | ASME SB 514 / 515 | |
| Incoloy 800H | ASTM B 407 / 163 | ASTM B 514 / 515 |
| ASME SB 407 / 163 | ASME SB 514 / 515 | |
| Incoloy 800HT | ASTM B 407 / 163 | ASTM B 514 / 515 |
| ASME B 407 / 163 | ASME SB 514 / 515 | |
| Incoloy 825 | ASTM B 423 / 163 | ASTM B 705 / 704 |
| ASME SB 423 / 163 |
ASME SB 705 / 704 |
Incoloy Alloy 800HT/825 Seamless Pipes, Alloy 800HT/825 Tubing's, UNS N08800, UNS N08825 Chemical Composition %
| Alloy 825 | Ni | Fe | Cr | Mb | Cu | Ti | C | Mn | S | Si | Al |
| 38.0-46.0 | 22.0 min | 19.5-23.5 | 2.5-3.5 | 1.5-3.0 | 0.6-1.2 | 0.05 max | 1.0 max | 0.03 max | 0.5 max | 0.2 max | |
| Alloy 800 | Ni | Fe | Cr | Cu | Ti | Al | C | Mn | S | Si | |
| 30.0-35.0 | 39.5 min | 19.0-23.0 | 0.75 max | 0.15-0.60 | 0.15-0.60 | 0.1 max | 1.5 max | 0.015 max | 1.0 max | ||
| Alloy 800H | Ni | Fe | Cr | Cu | Ti | Al | C | Mn | S | Si | |
| 30.0-35.0 | 39.5 min | 19.0-23.0 | 0.75 max | 0.15-0.60 | 0.15-0.60 | 0.05-0.10 max | 1.5 max | 0.015 max | 1.0 max | ||
| Alloy 800HT | Ni | Fe | Cr | Cu | Ti | Al | C | Mn | S | Si | |
| 30.0-35.0 | 39.5 min | 19.0-23.0 | 0.75 max | 0.25-0.60 | 0.85-1.20 | 0.06-0.10 max | 1.5 max | 0.015 max | 1.0 max |
Incoloy Alloy 800HT/825 Seamless Pipes, Alloy 800HT/825 Tubing's, UNS N08800, UNS N08825 Mechanical Properties
| INCOLOY 800 | INCOLOY 800H | INCOLOY 800HT | INCOLOY 825 | |
| Density | 7.94 g/cm3 | 7.94 g/cm3 | 7.94 g/cm3 | 8.1 g/cm³ |
| Melting Range,℃ | 1350-1400 ℃ | 1350-1400 ℃ | 1350-1400 ℃ | 1370-1400 |
| Elongation % | 30-35 | 30-35 | 30-35 | 30 |
| Tensile strength – Mpa | 500 | 500 | 500 | 550 |
| Yield strength – Mpa | 205 | 200 | 200 | 220 |
| Brinell hardness (HB) | – | – | – | ≤200 |
| NICKEL ALLOYS | TRADENAME | UNS NO. | WERKSTOFF NO. | DENSITY (8.8 G/CM3) |
| Alloy 800 | Incoloy 800 | N08800 | 1.4876 | 8.0 |
| Alloy 800H | Incoloy 800H | N08810 | 1.4876 | 8.0 |
| Alloy 800HT | Incoloy 800HT | N08811 | 1.4876 | 8.0 |
| Alloy 825 | Incoloy 825 | N08825 | 2.4858 | 8.18 |
Common Applications for Incoloy 800HT Bright Finish Tubing
Petrochemical Industry: Used in furnaces, heat exchangers, and other equipment exposed to harsh chemicals and high temperatures.
Power Generation: Due to its ability to withstand temperature fluctuations, it is ideal for use in superheater and reheater piping in power plants.
Industrial Furnaces: Used in heat treatment equipment, such as fixtures and baskets for heat treatment.
Differences from Incoloy 800H
Incoloy 800H (UNS N08810)
Has a similar base composition to 800HT, but 800HT has higher aluminum and titanium contents (0.85-1.20%) and higher carbon content (0.06-0.10%) than 800H.
This special compositional adjustment of 800HT provides excellent high-temperature properties, particularly in creep and rupture strength.
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, and we can provide customized alloy solutions tailored to customer needs. For alloy pricing inquiries or customized alloy solutions, please contact us for a quote at ss@gneemetal.com.
