Double L Fin Tube

Our Double L Fin Tube uses seamless copper tubing manufactured to ASTM B75 standards. Copper fin strips are then mechanically wound onto the copper tubing to form overlapping L-shaped supports, resulting in an extremely tight, fully covered mechanical connection. It offers advantages such as high thermal conductivity, high fatigue strength, and corrosion resistance, making it suitable for HVAC, condensers, evaporators, and industrial heat exchangers.
Tube Outer Diameter: 12 mm – 50 mm (customizable)
Tube Wall Thickness: 0.8–5 mm(customizable)
Fin Height: 6–15 mm(customizable)
Fin Thickness: 0.3-0.5 mm(customizable)
Fin Pitch: 8 – 14 fins per inch, or as customer's request
Tube Length: Can be customized upon request
Standard:ASTM B75,or as customer's request
Steel Grade:C10100, C10200, C10300, C10800, C12000, C12200

Products Description

Our Advantages

1. High Heat Transfer Efficiency

Our Double L Fin Tube features an LL-type overlapping fin design, significantly increasing the heat transfer surface area and reducing heat exchanger energy consumption.
Our finned tubes are made of high-quality pure copper, offering excellent thermal conductivity, and are tested using a spectrometer to ensure material quality.

2. Precise Dimensions

Our finned tube base tubes are manufactured using a precision cold-drawing process, ensuring strict dimensional tolerances; the fins are precisely controlled by a CNC finning machine to ensure consistent fin spacing, fin height, fin thickness, and winding tension.
All finned tubes produced by TORICH undergo rigorous dimensional inspection to ensure the base tube fully complies with ASTM B75 standards before finning.

3. High Compressive Mechanical Strength

Our tubes undergo rigorous mechanical performance testing to ensure excellent vibration resistance, guaranteeing long-term operational stability even under high mechanical stress.
Copper's natural ductility allows it to absorb thermal expansion and contraction without cracking; combined with the double L-type mechanically wound fin process, this ensures excellent stability of the tube during repeated thermal cycling.

4. Customization Services

TORICH offers customization services for tube length, fin height, fin density (FPI), fin thickness, and copper grade; and provides anti-corrosion coatings, passivation, or surface cleaning treatments.
For heat exchanger tube assemblies requiring complex wiring, U-bends or custom bends are available; ends are chamfered or threaded to suit assembly requirements.

application areas

Heating, ventilation, and air conditioning cooling coils
Air-cooled heat exchangers
Condensers and evaporators
Industrial heat recovery units
Petrochemical heat exchangers
Power plant cooling systems
Refrigeration equipment

Chemical Composition

Element	Cu (%)	O (%)	Impurities (%)
C10100 (OFE)	99.99 min	≤ 0.0005	Balance
C10200 (OF)	99.95 min	≤ 0.0010	Balance
C10300 (OFXLP)	99.95 min	≤ 0.0010	P ≤ 0.0003

Mechanical Properties

Property	Tensile Strength (MPa)	Yield Strength (MPa)	Elongation (%)	Hardness (HB)
C10100	205–250	69–100	30–45	45–60
C10200	215–275	70–110	30–40	55–65
C10300	220–290	75–120	25–35	60–75

Possible Alternative Grades

Alternative Grades	Reasons
C70600	90/10 Copper-Nickel offers excellent seawater corrosion resistance and good mechanical strength, making it suitable for use in marine condensers, desalination plants, and marine cooling systems.
TP304 / TP316L	It also boasts excellent corrosion resistance, high-temperature performance, and a long service life. Suitable for chemical processing, high-humidity air conditioning coils, etc.
C12000	With good thermal conductivity and excellent weldability, it is used in cost-effective heat exchanger coils, HVAC systems, and general industrial cooling devices.