ASTM A179 ASME SA179 G-TYPE EMBEDDED FIN TUBE WITH ALUMINUM FINS FOR HEAT EXCHANGERS
The G-Type embedded fin tube is a high-efficiency heat transfer component designed for demanding industrial applications including air-cooled heat exchangers, condensers, economizers, and heat recovery systems. This product features a seamless ASTM A179 low-carbon steel base tube with aluminum fins mechanically embedded into a precisely machined helical groove on the tube surface. The "G-Type" or embedded fin design involves a fin strip wound into a machined helical groove on the base tube and secured by the raised metal, ensuring a permanent mechanical bond with outstanding heat transfer efficiency and mechanical durability.
Base Tube Material – ASTM A179 / ASME SA179
ASTM A179 / ASME SA179 is a specification for seamless cold-drawn low-carbon steel tubes intended for tubular heat exchangers, condensers, and similar heat transfer apparatus. The material is chosen for its consistent quality, good ductility, and excellent thermal conductivity, making it ideal for the pressure-containing component of a heat transfer tube.
Chemical Composition of Base Tube (per ASTM A179 / ASME SA179)
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.06 – 0.18 |
| Manganese (Mn) | 0.27 – 0.63 |
| Phosphorus (P) | 0.035 max |
| Sulfur (S) | 0.035 max |
| Silicon (Si) | 0.25 max (typical) |
Mechanical Properties of Base Tube (per ASTM A179 / ASME SA179)
| Property | Requirement |
|---|---|
| Tensile Strength, min | 325 MPa (47 ksi) |
| Yield Strength, min | 180 MPa (26 ksi) |
| Elongation in 50 mm, min | 35% |
| Hardness (HRB) | 72 max |
Fin Material – Aluminum Alloy 1060 / 1100
The fins are manufactured from high-purity aluminum, typically Alloy 1060 or 1100, selected for outstanding thermal conductivity, lightweight properties, and corrosion resistance in atmospheric conditions. The aluminum fins provide superior resistance to oxidation and atmospheric corrosion.
Chemical Composition of Fin Material (Aluminum 1060 – Typical)
| Element | Composition (%) |
|---|---|
| Aluminum (Al) | 99.60 min |
| Copper (Cu) | 0.05 max |
| Iron (Fe) | 0.35 max |
| Silicon (Si) | 0.25 max |
| Others (each) | 0.03 max |
G-Type Embedded Fin Tube – Design and Manufacturing Process
The G-Type embedded design creates a strong, permanent mechanical bond through a specialized manufacturing process:
Base Tube Preparation – Seamless A179 carbon steel tube provides pressure resistance and structural integrity
Groove Machining – A helical groove (approximately 0.25–0.5 mm deep) is plowed into the tube wall
Fin Embedding – Continuous aluminum strip is wound under tension; the fin base inserts into the groove, and displaced tube metal rolls back to lock the fin securely
Mechanical Bond – This results in excellent metal-to-metal contact with minimal thermal resistance, ensuring fins stay firmly attached even under high temperatures, vibration, or thermal cycling
G-Type Embedded Fin Tube Specifications
| Parameter | Specification |
|---|---|
| Base Tube Material | ASTM A179 / ASME SA179 Seamless Carbon Steel |
| Fin Material | Aluminum 1060 / 1100 |
| Tube Outside Diameter | 12.7 mm – 219 mm |
| Tube Wall Thickness | 1.0 mm – 5.0 mm |
| Fin Height | 5 mm – 50 mm |
| Fin Thickness | 0.3 mm – 3.0 mm |
| Fin Pitch | 2.0 mm – 5.0 mm (customizable) |
| Tube Length | Up to 18,000 mm (customizable) |
| Max Operating Temperature | 400°C (750°F) |
Quality Control and Testing
Each G-Type embedded fin tube undergoes inspection and testing in accordance with applicable standards and customer specifications:
Hydrostatic Test – Performed on base tube per ASTM A179 requirements
Non-Destructive Examination (NDE) – Eddy Current Testing (ET) and Ultrasonic Testing (UT) as specified
Dimensional Inspection – Verification of tube OD, wall thickness, fin height, fin thickness, fin pitch, and overall length
Material Verification – Positive Material Identification (PMI) and full traceability to mill certificates
Visual Inspection – Surface finish, groove quality, and fin integrity
Flattening Test – To assess ductility and soundness
Flaring Test – To evaluate resistance to deformation
Key Advantages of G-Type Embedded Fin Tubes
Superior Heat Transfer Efficiency – The tight mechanical bond between the fin and tube maximizes heat exchange performance
High Temperature Stability – Embedded fins stay locked with no air gap at 400°C, preventing thermal resistance decay
Excellent Corrosion Resistance – Aluminum fins provide superior resistance to oxidation and atmospheric corrosion
High Mechanical Rigidity – The "lock-in" design prevents fin loosening under turbulence and vibration, ensuring long-term structural integrity
Optimized Heat Flux – Aluminum fins boost surface area up to 20 times the bare tube surface
Customizable Design – Fin height, thickness, pitch, and materials can be adjusted per customer requirements
Typical Applications for ASTM A179 G-Type Embedded Fin Tube
G-Type embedded fin tubes are widely used in applications requiring high heat transfer efficiency in demanding environments:
Air-Cooled Heat Exchangers (ACHE) – Petrochemical and refinery air coolers
Condensers – Power plant and industrial condensers
HRSG Boiler Economizers – Heat recovery steam generator systems
Superheaters – Power generation and steam systems
Waste Heat Recovery – Heat recovery systems for medium-temperature flue gas
Radiators – Industrial cooling systems
Charge Air Coolers – Turbocharger air cooling systems
HVAC Systems – Chilled water systems, heat pump systems, and air conditioning systems
Chemical Processing – Heating and cooling of chemicals, process fluid, and gases
Power Generation – Steam generators, boilers, and heat-recovery steam generators
Documentation
Each shipment is supplied with complete documentation including:
Mill Test Certificates (EN 10204 Type 3.1)
Dimensional inspection reports
Hydrostatic test reports
NDE reports (if applicable)
Heat treatment records (if applicable)
For a rapid quotation on ASTM A179 G-Type Embedded Fin Tube, please provide the following information:
Quantity (number of pieces or weight)
Base tube outside diameter, wall thickness, and length
Fin material (Aluminum 1060 / 1100 or other)
Fin height, thickness, and pitch/spacing
Finned length and unfinned sections (bare ends)
End preparation (plain ends or beveled ends)
Delivery period required
