ASTM B407 UNS N08811 Nickel alloy pipes for the petrochemical industry
ASTM B407 UNS N08811 Nickel alloy pipes for the petrochemical industry
ASTM B407 UNS N08811 (Incoloy 800HT) steel pipe is a nickel-iron-chromium alloy, crucial in the petrochemical industry due to its high strength, excellent high-temperature resistance, oxidation and carburization resistance, and superior creep and fracture strength. Its key advantages include high-temperature applications, corrosion resistance in harsh environments, the special properties of the 800HT grade, and compatibility with various processing and manufacturing processes.
What is the creep temperature of Alloy 800?
1100°F (600°C)
Alloy 800H exhibits good creep rupture properties at temperatures above 1100°F (600°C). Due to its maximum titanium and aluminum content of 0.7%, it maintains good ductility even after long-term use at temperatures below 1290°F (700°C). It is recommended to use standard annealed Alloy 800 at temperatures below 1100°F (600°C).
ASTM B407 UNS N08811 Nickel-Based Alloy Seamless Tube, Suitable for Petrochemical and Refinery Applications
ASTM B407 UNS N08811 is a nickel-iron-chromium alloy tube designed for high-temperature and corrosive environments. Commonly known as 800HT alloy, it is a high-performance material with excellent resistance to oxidation, carburization, and other high-temperature corrosion. The seamless tube form ensures it maintains superior mechanical properties and structural integrity under harsh conditions.
Key characteristics of ASTM B407 UNS N08811 seamless tube:
High Temperature Resistance
The N08811 alloy exhibits excellent thermal stability, making it ideal for applications with long-term exposure to temperatures up to 593°C (1100°F) and higher.
Corrosion Resistance
Even in extreme environments such as chemical plants, this alloy demonstrates excellent resistance to oxidation, carburization, and sulfidation.
Mechanical Strength
The addition of appropriate amounts of titanium (Ti) and aluminum (Al) significantly enhances mechanical properties, ensuring excellent creep resistance and stress fracture strength.
Seamless Structure
The seamless manufacturing process ensures product uniformity, eliminates weak points, and provides higher strength and reliability compared to welded pipes.
ASTM B407 Incoloy 800HT Tubing Mechanical Properties
| Alloy | Density | Melting Range | Tensile Stress | Yield Stress (0.2%Offset) | Elongation |
| Inconel 800HT Tubing | 7.94 g/cm3 | 1385 °C (2525 °F) | Psi - 75,000 , MPa - 520 | Psi - 30,000 , MPa - 205 | 30 % |
Incoloy NCF 800HT Tube Chemical Composition
| Alloy | C | Mn | Si | S | Cu | Fe | Ni | Cr | Al | Ti |
| 800HT | 0.06 - 0.10 | 1.50 max | 1.00 max | 0.015 max | 0.75 max | 39.50 min | 30.00 - 35.00 | 19.00 - 23.00 | 0.15 - 0.60ᴬ | 0.15 - 0.60 |
Standards and Specifications:
ASTM B407: Standard specification for seamless nickel-iron-chromium alloy tubing.
A variety of sizes and wall thicknesses are available to meet specific application needs.
Advantages of using UNS N08811 seamless tubing:
Seamless construction provides superior structural integrity and reliability.
Resistant to high-temperature scaling and thermal cycling.
Longer service life in harsh environments, reducing maintenance and replacement costs.
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.
