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
| Element | Composition (% by weight, max unless range is specified) |
| Carbon (C) | 0.15 max |
| Manganese (Mn) | 0.30–0.60 |
| Phosphorus (P) | 0.025 max |
| Sulfur (S) | 0.025 max |
| Silicon (Si) | 0.50 max |
| Chromium (Cr) | 4.00–6.00 |
| Molybdenum (Mo) | 0.45–0.65 |
| Iron (Fe) | Balance |
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)
| Property | Requirement (Min) | Typical Value / Note |
| Tensile Strength | 415 MPa (60,000 psi) | Typically 415–585 MPa |
| Yield Strength (0.2% offset) | 205 MPa (30,000 psi) | Typically 205–275 MPa |
| Elongation (in 50 mm or 2 in.) | 30% (for wall thickness ≥ 0.07 in / 1.8 mm) See table below for thinner walls |
Ductility decreases with thinner walls; standard test specimen. |
| Hardness (optional, not required) | — | Typically ~150–200 HB (Brinell) |
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.
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