ASTM A179 Carbon Steel Seamless G-Type Embedded Fin Tube For HRSG Boiler Economizer And Superheater
ASTM A179 Embedded Fin Tube For HRSG
Ⅰ.What is the A179 Embedded Fin Tube For HRSG?
ASTM A179 embedded fin tubes with Al1060 fins are mainly used for heat recovery in HRSG equipment. The base pipe is made of seamless ASTM A179 carbon steel, which has stable thermal conductivity and favorable cost. It also performs well in bearing pressure and temperature changes during operation. High-purity Al1060 aluminum fins are embedded on the tube surface through mechanical processes, ensuring a zero-clearance mechanical bond.
This structure greatly enlarges the heat exchange area and improves heat recovery efficiency for medium-temperature flue gas. The Al1060 material also provides good corrosion resistance, reducing wear and oxidation caused by flue gas. Meanwhile, the carbon steel base tube can safely hold high-pressure water and steam. With stable performance, high heat exchange efficiency and low operation cost, this fin tube is a practical and economical option for both industrial and power plant HRSG systems.
II. Chemical & Mechanical Properties
Base Tube Chemical Composition (ASTM A179) (%)
| Element | C | Si (max) | Mn | P (max) | S (max) |
| Range | 0.06–0.18 | 0.25 | 0.27–0.63 | 0.035 | 0.035 |
Fin Material Chemical Composition (Al1060) (%)
| Element | Al (min) | Si + Fe (max) | Cu (max) | Mn (max) | Mg (max) | Zn (max) | Others (each) |
| Range | 99.60 | 0.35 | 0.05 | 0.03 | 0.03 | 0.05 | 0.03 |
Mechanical Properties (Base Tube)
| Tensile Strength (min) | Yield Strength (min) | Elongation (min) |
| 325 MPa | 180 MPa | 35% |
Ⅲ. Key Advantages for HRSG Systems
● Temperature Stability (Up to 400°C):Unlike L/ LL-type fins that lose grip at high temps, our embedded fins stay locked. No air gap at 400°C prevents thermal resistance decay.
● High Mechanical Rigidity:Turbine exhaust turbulence and vibration won’t loosen our G-fin “lock-in” design, ensuring decades of structural integrity.
● Optimized Heat Flux:Al1060 fins boost surface area up to 20x surface area enhancement vs. bare tubes, enabling smaller HRSG modules and lower CAPEX while matching steam output.
● Thermal Cycling Resistance:Our embedded bond handles frequent start-stop cycles far better than soldered/wrapped fins, delivering consistent performance.
Ⅳ. Key Applications in HRSG
● Economizer Sections: Preheating feedwater by stripping maximum energy from cooler exhaust gases.
● Low-Pressure (LP) Evaporators: Driving phase-change efficiency in low-pressure steam circuits.
● Waste Heat Recovery Units (WHRU): Bridging the gap between gas turbine exhaust and process heating in the 200–350°C range.
● District Heating: Providing long-term reliability in outdoor heat exchange networks where aluminum’s natural oxide layer resists atmospheric corrosion.
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