ASTM A106 Gr.B Embedded Finned Tubes for Economizer

ASTM A106 Gr.B embedded finned tubes are specially designed for superheater applications where efficient heat transfer, high-temperature resistance, and stable mechanical performance are required. Manufactured with seamless ASTM A106 Grade B carbon steel tubes as the base material, these G-type embedded fin tubes provide an increased heat transfer surface area through mechanically inserted fins, making them suitable for industrial boilers, waste heat recovery systems, and power generation equipment.

The embedded fin structure is produced by machining a spiral groove on the outer surface of the base tube and inserting the fin strip into the groove. This mechanical locking process improves the contact between the tube and fin, ensuring reliable heat conduction under continuous high-temperature operating conditions.

ASTM A106 Gr.B embedded finned tubes are widely used in:

• Boiler superheaters
• Waste heat boilers
• HRSG (Heat Recovery Steam Generator)
• Power plant heat recovery systems
• Industrial furnaces and combustion equipment
• Petrochemical heating and steam generation systems

In superheater applications, these finned tubes transfer heat from hot flue gas to steam, increasing steam temperature and improving overall thermal efficiency.

Base Tube Material:

• ASTM A106 Grade B Seamless Carbon Steel Pipe

Fin Material Options:

• Carbon Steel
• Stainless Steel
• Alloy Steel (according to operating conditions)

For superheater service, carbon steel or alloy steel fins are commonly selected to match temperature requirements and thermal expansion characteristics.

Typical manufacturing dimensions include:

Base Tube Outside Diameter:

• 25.4 mm – 114.3 mm

Tube Wall Thickness:

• 2.5 mm – 12 mm

Fin Height:

• 6 mm – 25 mm

Fin Thickness:

• 0.5 mm – 3 mm

Fin Pitch:

• 2.5 mm – 8 mm

Tube Length:

• Up to 12 meters or customized according to equipment design

Specific dimensions can be produced according to customer drawings, heat exchanger design requirements, and operating parameters.

Typical chemical composition requirements:

• Carbon (C): ≤ 0.30%
• Manganese (Mn): 0.29–1.06%
• Phosphorus (P): ≤ 0.035%
• Sulfur (S): ≤ 0.035%
• Silicon (Si): ≥ 0.10%

The controlled chemical composition provides good weldability, strength, and suitability for elevated temperature applications.

Typical mechanical properties of ASTM A106 Gr.B:

• Tensile Strength: ≥ 415 MPa
• Yield Strength: ≥ 240 MPa
• Elongation: ≥ 30%