ASTM A335 P9 Alloy Steel Seamless Pipe, Studded Fin Tube, For Furcane Tube Application

ASTM A335 P9 Alloy Steel Seamless Pipe, Studded Fin Tube, For Furnace Tube

Product Overview

The ASTM A335 P9 Alloy Steel Studded Fin Tube is designed for high-temperature furnace applications where effective heat transfer and durability under extreme conditions are crucial. The P9 alloy steel base tube is equipped with studs (carbon or alloy steel) welded onto the surface to create a studded fin configuration. This design increases the heat transfer area and enhances gas-side heat transfer in furnace tubes, making it ideal for convection sections and superheating zones in fired heaters and industrial furnaces.

Chemical Composition – ASTM A335 P9 (Base Tube)

Stud Material (typically Carbon Steel or Alloy Steel)

• Stud Size: Usually in a cylindrical shape (6–10 mm diameter, 10–20 mm height)

• Stud Material: Carbon Steel (Q235B) or Alloy Steel (P11 or P22)

Mechanical Properties – ASTM A335 P9

Advantages

• Increased Heat Transfer Efficiency
  The studs enhance heat transfer by increasing the effective surface area, ensuring better gas-to-fluid heat exchange in high-velocity air or flue gas environments.

• High-Temperature Performance
  P9 alloy steel provides excellent creep resistance and oxidation resistance, making it perfect for furnace applications with sustained high-temperature exposure.

• Durability in Harsh Environments
  The combination of P9 alloy steel and studded fins ensures resistance to high pressures, thermal shock, and mechanical stresses, ideal for use in industrial furnaces.

• Superior Mechanical Bonding
  The welded studs are robustly attached to the tube, providing excellent resistance to detachment under thermal cycling or vibration.

• Improved Fouling Resistance
  The studded design reduces the chance of debris or soot build-up on the fin surface, minimizing maintenance and cleaning efforts.

Applications

This product is widely used in:

• Furnace Convection Coils
  In petrochemical refineries, gas turbines, and power plants, where heat recovery from flue gases is necessary.

• Industrial Boilers
  In both fire-tube and water-tube boiler systems to enhance heat transfer.

• Superheaters & Reheaters
  In thermal power plants to improve the heat recovery from exhaust gases and enhance system efficiency.

• Waste Heat Recovery Systems (WHRU)
  Effective in recovering energy from flue gases to improve overall system efficiency in industries.