Product Overview
ASTM A106 Gr.B Embedded Finned Tubes with CU-T2 copper fins are engineered for high-efficiency air-cooled heat exchangers and industrial cooling systems requiring superior thermal conductivity and long-term operational reliability. The embedded fin manufacturing process mechanically inserts and locks the copper fin strip into a precisely machined groove on the carbon steel tube surface, creating a strong metallurgical-like bond that ensures excellent heat transfer performance and resistance to fin loosening under thermal cycling.
Combining the mechanical strength of ASTM A106 Grade B seamless steel tubes with the exceptional thermal conductivity of CU-T2 copper fins, these finned tubes are widely used in air coolers, process coolers, gas coolers, oil coolers, compressor aftercoolers, power generation facilities, petrochemical plants, and HVAC heat recovery systems.
Key Features
- High heat transfer efficiency due to high-conductivity CU-T2 copper fins.
- Excellent mechanical strength provided by ASTM A106 Gr.B seamless steel tube.
- Strong fin-to-tube bond achieved through embedded fin technology.
- Superior resistance to vibration and thermal fatigue.
- Reduced air-side thermal resistance.
- Extended service life in industrial cooling applications.
- Suitable for high-pressure process systems.
- Optimized design for compact heat exchanger construction.
- Lower operating costs through improved energy efficiency.
Manufacturing Process
Embedded finned tubes are produced by machining a continuous helical groove into the external surface of the ASTM A106 Gr.B tube. A CU-T2 copper fin strip is then mechanically wound and tightly embedded into the groove. The base tube material is displaced around the fin root to securely lock the fin in place.
This manufacturing method provides:
- High fin attachment strength.
- Excellent thermal contact between fin and tube.
- Uniform fin geometry.
- Reliable operation under continuous thermal cycling.
- Reduced risk of fin separation compared with conventional wound fin tubes.
Standard Dimensions
Base Tube (ASTM A106 Gr.B)
Outside Diameter Range:
- 19.05 mm (3/4")
- 25.40 mm (1")
- 31.75 mm (1-1/4")
- 38.10 mm (1-1/2")
- 50.80 mm (2")
- 57.15 mm (2-1/4")
- 60.33 mm (2-3/8")
- 63.50 mm (2-1/2")
Wall Thickness:
Tube Length:
CU-T2 Copper Fin
Fin Height:
Fin Thickness:
Fin Pitch:
Fin Density:
Dimensions can be customized according to thermal design requirements.
Material Specifications
Base Tube Material
ASTM A106 Grade B Seamless Carbon Steel Tube
Applicable Standards:
Typical Applications:
- Heat exchangers
- Air coolers
- Process piping
- Refinery equipment
- Power generation systems
Fin Material
CU-T2 Copper
Applicable Standards:
- ASTM B152
- GB/T 5231
- EN CW004A
Characteristics:
- High thermal conductivity
- Excellent ductility
- Good corrosion resistance
- Superior fin forming capability
Chemical Composition
ASTM A106 Grade B
| Element |
Composition (%) |
| Carbon (C) |
Max 0.25 |
| Manganese (Mn) |
0.27–0.93 |
| Phosphorus (P) |
Max 0.035 |
| Sulfur (S) |
Max 0.035 |
| Silicon (Si) |
Min 0.10 |
| Copper (Cu) |
Max 0.40 |
| Nickel (Ni) |
Max 0.40 |
| Chromium (Cr) |
Max 0.40 |
| Molybdenum (Mo) |
Max 0.15 |
| Vanadium (V) |
Max 0.08 |
CU-T2 Copper Fin Material
| Element |
Composition (%) |
| Copper + Silver (Cu+Ag) |
≥99.90 |
| Oxygen (O) |
≤0.015 |
| Impurities Total |
≤0.10 |
Mechanical Properties
ASTM A106 Grade B Tube
| Property |
Value |
| Tensile Strength |
≥330 MPa |
| Yield Strength |
≥205 MPa |
| Elongation |
≥35% |
| Hardness |
≤79 HRB (Typical) |
CU-T2 Copper Fin
| Property |
Value |
| Tensile Strength |
200–250 MPa |
| Elongation |
≥30% |
| Thermal Conductivity |
Approx. 390 W/m·K |
| Electrical Conductivity |
≥97% IACS |
Inspection and Testing
To ensure consistent quality and compliance with project specifications, every batch of embedded finned tubes can undergo the following inspections:
Raw Material Inspection
- Material certificate verification
- Chemical composition analysis
- Dimensional inspection
- Surface quality examination
Manufacturing Inspection
- Fin pitch measurement
- Fin height verification
- Fin thickness inspection
- Groove depth inspection
- Fin winding integrity examination
Mechanical Testing
- Fin bond strength test
- Flattening test
- Tensile test
- Hardness test
Non-Destructive Testing
- Hydrostatic pressure test
- Eddy current testing
- Ultrasonic testing (UT)
- Magnetic particle testing (when required)
Final Inspection
- Visual inspection
- Length verification
- Straightness inspection
- Packing inspection
- Third-party witness inspection available
Applications
ASTM A106 Gr.B Embedded Finned Tubes with CU-T2 Copper Fins are extensively used in:
- Air-Cooled Heat Exchangers (ACHE)
- Petrochemical Plants
- Refineries
- Natural Gas Processing Facilities
- Power Stations
- Compressor Cooling Systems
- Oil Cooling Units
- Process Coolers
- Waste Heat Recovery Systems
- HVAC Industrial Cooling Equipment
Advantages for Air Cooler Applications
The combination of ASTM A106 Gr.B carbon steel and CU-T2 copper fins offers an ideal balance between mechanical strength and thermal performance. Copper fins significantly increase external heat transfer surface area while maintaining low thermal resistance, enabling higher cooling efficiency and reduced equipment footprint.
For air cooler manufacturers seeking reliable and cost-effective heat transfer solutions, embedded copper finned tubes remain one of the most effective options for maximizing thermal performance while ensuring long-term operational stability.
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