ASME SB407 UNS N08811 Nickel alloy steel pipes for oil and gas applications
ASME SB407 UNS N08811 Nickel alloy steel pipes for oil and gas applications
ASME SB407 UNS N08811 nickel alloy steel pipes (commonly known as Incoloy 800HT) are crucial in oil and gas applications because they require superior strength and corrosion resistance in extremely high temperature and pressure environments. These pipes are designed for operating temperatures above 1100°F (593°C).
What is the difference between N08810 and N08811?
It is important to note that the maximum permissible design stress of INCOLOY Alloy 800HT (UNS N08811) is higher than that of UNS N08810. Therefore, other materials manufactured according to the UNS N08810 (Alloy 800H) standard cannot obtain UNS N08811 certification unless they meet the additional requirements of that standard.
ASME SB407 UNS N08811 Nickel Alloy Seamless Tubes for Oil and Gas Projects
The ASTM B407 / ASME SB407 standard covers alloys such as UNS N08120, UNS N08800, UNS N08801, UNS N08810, UNS N08811, UNS N08890, and UNS N06811, available as cold-worked and hot-finished annealed seamless tubes.
Alloys UNS N08120, UNS N08810, UNS N08811, and UNS N08890 are typically used for operating temperatures above 1100°F (593°C), where good creep and fracture resistance are required. These alloys are annealed to achieve controlled grain size, resulting in optimal performance within this temperature range.
Chemical Composition %
| Ni | Cu | Fe | Mn | C | Si | Cr |
| 30-35 | 0.75max | 39.5min | 1.5max | 0.1max | 1max | 19-23 |
Mechanical Property
| Density | Melting Point | Tensile Strength | Yield Strength (0.2%Offset) | Elongation |
| 7.94 g/cm3 | 1357-1385 °C | 87ksi (600MPa) | 43ksi (295MPa) | 44% |
Oil and Gas Applications
The unique properties of ASME SB407 UNS N08811 make it suitable for demanding applications in the oil and gas industry, including:
Heat Exchangers: For air cooling of process fluids in oil refineries.
Furnace Components: Widely used in various components of industrial furnaces and heat treatment equipment due to their resistance to high-temperature corrosion.
Process Piping: Ideal for piping systems transporting corrosive and high-temperature media in chemical and petrochemical processing plants.
Steam Generation: For superheater and reheater piping in power plants and steam generators.
Ethylene Production: For the production of ethylene and related process equipment.
Why Choose Gnee Nickel Alloy (Supplier Example)?
✅ Large stock of Incoloy 800/800H/800HT alloy tubes/bars/plates/fittings, fast shipping.
✅ Factory direct sales, highly competitive prices, excellent value for money.
✅ Comprehensive quality assurance: Material Testing Certificate (MTC), chemical composition certificate, and mechanical properties certificate.
✅ Value-added services: slitting, cutting, polishing, surface treatment.
✅ Worldwide shipping, secure and reliable packaging, and provision of export-required documents.
Email: ss@gneesteel.com
Gnee Steel is a supplier of Incoloy 800/800H/800HT steel, offering a wide range of products including: seamless pipe (sizes: 4-219 mm; thickness: 0.5-20 mm); welded pipe (sizes: 5.0-1219.2 mm; thickness: 0.5-20 mm); plates (thickness 0.1 to 100 mm; width 10-2500 mm); strips; alloy round bars (diameter 3-800 mm); flat bars (thickness 2-100 mm; width 10-500 mm); hexagonal bars (size 2-100 mm); wire rods; and extruded profiles. We collaborate with steel mills to provide our customers with 800 series alloys, meeting or exceeding numerous leading industry standards, including ASTM, ASME, SAE, AMS, ISO, DIN, EN, and BS standards.
Gnee Steel stocks and sells Incoloy 800/800H/800HT steel, including pipes, plates, strips, round bars, flat bars, forged billets, hexagonal steel, wire rods, and extruded profiles. Please feel free to contact us at ss@gneesteel.com for a quote.
