ASTM B407 UNS NO8811 Nickel Alloy Seamless Tube For Petrochemical and Refinery

ASTM B407 UNS N08811 is a nickel-iron-chromium alloy tube designed for use in high-temperature and corrosive environments. It is commonly known as Alloy 800HT, which is a high-performance material offering excellent resistance to oxidation, carburization, and other forms of high-temperature corrosion. The seamless tube form ensures superior mechanical properties and structural integrity under demanding conditions.

Key Features of ASTM B407 UNS N08811 Seamless Tube:

• High Temperature Resistance
  Alloy N08811 exhibits excellent thermal stability, making it ideal for applications involving prolonged exposure to temperatures up to 1100°F (593°C) and higher.

• Corrosion Resistance
  The alloy provides exceptional resistance to oxidation, carburization, and sulfidation, even in extreme environments like chemical processing plants.

• Mechanical Strength
  Enhanced mechanical properties due to the addition of controlled levels of titanium (Ti) and aluminum (Al), ensuring excellent creep and stress rupture strength.

• Seamless Construction
  The seamless manufacturing process ensures uniformity, eliminates weak points, and provides superior strength and reliability compared to welded tubes.

Chemical Composition:

The typical chemical composition of UNS N08811 is as follows:

• Nickel (Ni): 30-35%
• Chromium (Cr): 19-23%
• Iron (Fe): Balance
• Carbon (C): ≤ 0.10%
• Manganese (Mn): ≤ 1.50%
• Silicon (Si): ≤ 1.00%
• Sulfur (S): ≤ 0.015%
• Aluminum (Al): 0.25-0.60%
• Titanium (Ti): 0.25-0.60%

Applications:

Due to its outstanding properties, ASTM B407 UNS N08811 is widely used in industries such as:

• Petrochemical and Refinery: Heat exchangers, furnace components, and reformer tubes.
• Power Generation: Superheater and reheater tubing in boilers.
• Chemical Processing: Equipment exposed to corrosive environments like reactors and pressure vessels.
• Aerospace and Marine: High-temperature components requiring durability under stress.

Standards and Specifications:

• ASTM B407: Standard specification for seamless nickel-iron-chromium alloy tubes.
• Available in various dimensions and wall thicknesses, meeting the requirements of specific applications.

Advantages of Using UNS N08811 Seamless Tubes:

• Superior structural integrity and reliability due to seamless construction.
• Resistance to high-temperature scaling and thermal cycling.
• Long service life in demanding environments, reducing maintenance and replacement costs.