ASME SA209 Embedded Fin Tube With AL1060 Fin For Boiler Economizers and Air Heaters

1. Base Tube Material: SA209

Composition:

Carbon (C) 0.10–0.20%
Manganese (Mn) 0.30–0.80%
Phosphorus (P) ≤ 0.025%
Sulfur (S) ≤ 0.025%
Silicon (Si) 0.10–0.50%
Molybdenum (Mo) 0.44–0.65%
Copper (Cu) ≤ 0.25% (if present)
Chromium (Cr) ≤ 0.30%
Nickel (Ni) ≤ 0.40%
Vanadium (V) ≤ 0.03%

Properties:

• Good high-temperature strength and creep resistance.
• Improved resistance to oxidation and corrosion compared to plain carbon steels at elevated temperatures.
• Good weldability.

2. Fin Material: AL1060

Properties:

Excellent Thermal Conductivity: (~230 W/m·K) - The primary reason for using aluminum fins.

Good Corrosion Resistance: Forms a protective oxide layer.

High Formability/Ductility: Easily shaped during manufacturing.

Low Density: Lightweight.

Low Strength: Softer than alloyed aluminums, but sufficient for many fin applications.

High Electrical Conductivity.

3. Fin Type: Embedded (G-Fin)

Manufacturing Process:

• A groove is machined (often by knurling) into the outer surface of the steel base tube.
• A strip of aluminum fin stock (AL1060) is fed into the groove.
• High-pressure rollers or dies force the tube wall material over the edges of the aluminum strip, cold-working and mechanically locking the fin base securely into the groove. This creates a continuous, tight, mechanical bond along the entire length of the fin.

Key Features:

• Strong Mechanical Bond: The fin is physically locked into the tube wall, offering excellent resistance to fin loosening due to thermal cycling or vibration.
• No Solder/Braze: Eliminates issues like flux corrosion, braze alloy melting point limitations, or potential voids in the bond line.
• Direct Metal-to-Metal Contact: Provides low interfacial thermal resistance (good heat transfer efficiency).
• Fin Integrity: The AL1060 fin material itself remains unaltered (not melted), retaining its full thermal conductivity and corrosion resistance.
• Fin Density: Allows for relatively high fins per inch (FPI).
• Appearance: Typically has a clean, metallic look with a visible seam where the tube metal is rolled over the fin base.

Key Advantages:

• High heat transfer efficiency.
• Excellent fin bond strength and durability under thermal cycling.
• Good high-temperature capability of the base tube.
• Corrosion resistance of fins (AL1060) and base tube (SA209).
• No low-melting-point braze alloys to limit operating temperature.

4. Application

• Marine & Offshore Systems
• Desalination Plant Heat Exchangers
• Sulfuric Acid (H₂SO₄) Coolers
• Sour Gas (H₂S) Reboilers
• Steam Condensers in Geothermal Plants
• Flue Gas Waste Heat Recovery
• Ammonia (NH₃) Evaporators
• Heat Recovery Ventilators (HRVs)

5.Typical Applications:

• Heat Recovery Steam Generators (HRSGs): Economizer and evaporator sections.
• Boiler Economizers: Recovering heat from flue gases.
• Air Heaters (Ljungström type or tubular): Preheating combustion air.
• Process Gas Heaters/Coolers: In refineries, petrochemical, and chemical plants.
• High-Temperature Finned Tube Bundles: Where both elevated temperature resistance and efficient extended surface are required.

AL1060 Embedded Fin Tube

Boiler Economizers Embedded Fin Tube

Air Heaters Embedded Fin Tube

ASME SA209 Embedded Fin Tube With AL1060 Fin For Boiler Economizers and Air Heaters Images