ASTM A213 T5 Embedded G Finned Tube with Al1100 Fins For Waste Heat Boilers

ASTM A213 T5 Embedded G Finned Tube with Al1100 Fins For Waste Heat Boilers

ASTM A213 T5 Embedded G Finned Tube with Al1100 Fins is a high-efficiency heat transfer tube designed for use in high-temperature and/or high-pressure environments. It is is a high-performance heat exchanger tube where a high-temperature steel pressure tube (T5) is mechanically bonded via an embedded groove (Embedded) to highly conductive aluminum fins (Al1100) with an optimized trapezoidal profile (G-fin) for superior heat transfer in demanding industrial applications.

Component Breakdown

1. Base Tube: ASTM A213 T5 seamless tubes

(1). Chemical Composition Requirements

Note: The alloy is a low-carbon 5Cr-0.5Mo steel. Cu, Ni, and other residuals may have limits per the general requirements of the specification.

(2). Mechanical Properties (for Seamless Tube)

2. The Fin Type: Embedded G Finned Tube

Key Advantages of Embedded Bond:

• Excellent thermal contact (low contact resistance): The metal-to-metal contact is very tight, ensuring efficient heat flow from fin to tube.
• High mechanical strength: The fin is locked in place, resistant to vibration and handling damage.
• Prevents fin loosening due to differential thermal expansion between steel and aluminum.
• Allows the use of a softer, high-conductivity fin material (like Al1100) on a much stronger base tube.

3. Fin’s Material: Al1100

Al1100: This is a commercial purity aluminum alloy (99.0% minimum aluminum). It is chosen specifically for its:

Very High Thermal Conductivity (~220 W/m·K): This is the primary reason for its use. It allows heat from the hot gas to spread rapidly across the fin surface, maximizing efficiency.

• Good Corrosion Resistance in many atmospheres.
• Excellent Formability & Ductility: Essential for the embedding process without cracking.
• Light Weight: Reduces the overall weight of the heat exchanger

4. Why This Specific Combination is Used

This tube combines the high-temperature strength and pressure integrity of alloy steel (T5) with the exceptional heat-dissipation capability of pure aluminum (1100). The embedded "G" fin provides the robust, reliable mechanical bridge between the two.

It is the ideal choice when you need:

A tube that can withstand internal high-pressure steam/water.

• Operation in a high-temperature flue gas environment (where the T5 steel is necessary).
• Maximum heat recovery efficiency from the gas side (where the Al1100 fins excel).
• A durable, long-life product that won't fail from fin loosening or poor heat transfer.

Primary Application: Waste Heat Recovery Units (WHRUs) & Heat Recovery Steam Generators (HRSGs)

Typical Installations:

• Gas Turbine Exhaust Ducts: In combined-cycle or cogeneration power plants, the hot exhaust (500-650°C / 930-1200°F) from a gas turbine passes over banks of these finned tubes to generate steam for a secondary steam turbine (increasing plant efficiency from ~40% to over 60%).
• Industrial Process Exhausts: Capturing heat from furnaces, kilns, or chemical reactors in industries like refining, petrochemicals, and cement.

Secondary Applications:

• Process Heaters & Fired Heaters: In refineries, used in the convection section to preheat process fluids or generate steam using waste heat from the radiant section.
• Air Heaters / Economizers: Preheating combustion air for boilers or process air using waste flue gas, improving overall fuel efficiency.