High-Performance Embedded G-Type Finned Tubes for Efficient Heat Transfer
Our Embedded G-Type Finned Tubes (also known as G-Fin or Grooved Finned Tubes) deliver superior heat transfer efficiency in demanding industrial applications. These tubes feature a seamless ASTM A179 low-carbon steel base tube with aluminum fins mechanically embedded into a precisely machined helical groove on the tube surface.
This robust mechanical bond ensures excellent thermal contact, high temperature resistance (up to approximately 350–400°C), and long-term durability under thermal cycling and vibration. Manufacturers and engineers widely choose these tubes for air-cooled heat exchangers, condensers, and other heat recovery systems.
Product Material: ASTM A179 Seamless Carbon Steel Base Tube + Aluminum Fins
Base Tube Material: ASTM A179 / ASME SA179 seamless cold-drawn low-carbon steel tubes, ideal for heat exchangers and condensers due to excellent formability, weldability, and thermal conductivity.
Fin Material: High-purity aluminum (typically Alloy 1060 or 1100), selected for outstanding thermal conductivity, lightweight properties, and corrosion resistance in atmospheric conditions.
Chemical Composition
Base Tube (ASTM A179 Carbon Steel)
| Element |
Composition (%) |
| Carbon (C) |
0.06 - 0.18 |
| Manganese (Mn) |
0.27 - 0.63 |
| Phosphorus (P) |
≤ 0.035 |
| Sulfur (S) |
≤ 0.035 |
| Silicon (Si) |
≤ 0.25 (typical) |
Fins (Aluminum Alloy 1060 - Typical)
| Element |
Composition (%) |
| Aluminum (Al) |
≥ 99.60 |
| Copper (Cu) |
≤ 0.05 |
| Iron (Fe) |
≤ 0.35 |
| Silicon (Si) |
≤ 0.25 |
| Others (each) |
≤ 0.03 |
Finned Tube Structure and Embedding Process
The G-Type embedded design creates a strong, permanent mechanical bond:
- Fins: Continuous aluminum strip wound under tension.
- Embedding Process: A helical groove (approx. 0.25–0.5 mm deep) is plowed into the tube wall. The fin base inserts into the groove, and displaced tube metal rolls back to lock the fin securely. This results in excellent metal-to-metal contact with minimal thermal resistance.
This process ensures fins stay firmly attached even under high temperatures, vibration, or thermal expansion, outperforming wrapped or L-type fins in reliability.
Standard Dimensions and Tolerances
Typical specifications (custom sizes available):
| Parameter |
Range |
| Base Tube OD |
15.88 mm – 50.8 mm (commonly 19–38.1 mm) |
| Base Tube Wall Thickness |
1.0 – 3.0 mm (min. ~2.11 mm / 14 BWG for many applications) |
| Fin Height |
6.35 – 25.4 mm (commonly 9.5–16 mm) |
| Fin Thickness |
~0.3 – 0.5 mm (typically 0.4 mm) |
| Fin Pitch (FPI) |
5 – 13 fins per inch (commonly 8–11 FPI) |
| Fin Tube OD (over fins) |
Up to ~57–70 mm depending on height |
| Tube Length |
Up to 18,500 mm (custom cut-to-length) |
Tolerances (typical industry standards):
- Fin OD: +0 / -0.38 mm (or as specified)
- Length: ±3 mm or per customer spec (e.g., ±3.2 mm for <7.3 m)
Performance Advantages
- Excellent Heat Transfer: Tight mechanical bond minimizes contact resistance for superior efficiency.
- High Temperature Resistance: Suitable for continuous operation up to 350–400°C.
- Durable Bond: Fins resist loosening from thermal cycling, vibration, or high-velocity air flow.
- Corrosion Resistance: Aluminum fins perform well in atmospheric and mildly corrosive environments.
- Compact Design: Increased surface area allows smaller, more efficient heat exchangers.
- Mechanical Strength: Embedded design handles pressure and mechanical stresses effectively.
Detailed Application Fields
Embedded G-Type Finned Tubes excel in:
- Petrochemical & Refining: Air-cooled heat exchangers (fin-fan coolers), condensers, and waste heat recovery.
- Power Generation: Steam condensers, economizers, and turbine exhaust cooling.
- Oil & Gas: Process coolers and gas compression systems.
- Metallurgy & Steel Industry: High-temperature gas cooling and heat recovery units.
- Chemical Processing: Reactors and distillation column condensers.
- HVAC & Refrigeration: Large-scale air-cooled condensers and evaporators.
These tubes are proven in projects for major clients in Sinopec, PetroChina, and global power/metallurgy sectors.
Why Choose Our G-Type Embedded Finned Tubes?
Our advantages include:
- Advanced CNC grooving and embedding production lines for precise, repeatable quality.
- Strict material traceability with full mill test certificates (EN10204 3.1/3.2).
- Custom engineering support for specific dimensions, materials, and performance requirements.
- Thorough quality control: dimensional checks, hydrostatic testing, hardness, and visual inspection.
- Strong export experience with packaging optimized for sea freight to markets worldwide.
Our tubes meet or exceed ASTM, ASME, and international standards, ensuring long service life and optimal performance in your heat transfer systems.
Contact us today for detailed quotations, technical drawings, or custom specifications. We help you select the right G-Type finned tube solution for maximum efficiency and reliability.
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