L Fin Tube

Our L-Fin Tube is a wound finned tube. The base tube is made of high-quality stainless steel, with stainless steel or aluminum fins spirally wound around it. The bottom edge of the fins forms an "L"-shaped base. This L-shaped base fits tightly against the tube wall, improving mechanical connection and increasing the contact area with the base tube, thereby enhancing heat transfer. It is widely used in industries such as oil and gas, HVAC, and industrial cooling systems.
Tube Outer Diameter: 12-165mm (customizable)
Tube Wall Thickness: 1–20 mm(customizable)
Fin Height: 6–50 mm(customizable)
Fin Thickness: 0.3-5.0 mm(customizable)
Fin Pitch: 4-13 FPI, or as customer's request
Tube Length: Can be customized upon request
Standard:ASTM A213,or as customer's request
Steel Grade:304, 316, 310, 321, 347,2507,etc.

Products Description

Our Advantages

1. High Heat Transfer Efficiency

Our L-Fin Tubes are tightly wound around the tube surface, creating a large, continuous contact area. This minimizes thermal resistance, enhances heat conduction, and significantly improves the overall heat exchange efficiency of air coolers, heaters, boilers, and other equipment used in chemical processing.
Each TORICH stainless steel L-fin tube undergoes fin adhesion (bonding strength) testing to ensure the fins remain firmly connected under high thermal cycling, vibration, and mechanical stress.

2. High Temperature Resistance

Our tubes are made of high-quality stainless steel, including 304, 310, and 316, which provide excellent strength and oxidation resistance at high temperatures. The L-shaped foot tension winding structure creates a strong mechanical lock between the fins and the tube, preventing fin loosening due to thermal expansion.
TORICH tubes undergo high-temperature thermal cycling and high-temperature oxidation tests. Depending on the grade, the tubes exhibit stable performance, with a maximum temperature range of 800–1100°C.

3. Seamless Structure

Our base tubes are seamless tubes manufactured using a cold-drawing process, resulting in a high degree of surface smoothness. This ensures a stronger bond between the tube and fins, high dimensional accuracy, and easier heat exchanger assembly.
The tubes undergo rigorous dimensional testing, ultrasonic testing, and hydrostatic testing to ensure they are free of internal defects and can withstand high pressure.

4. Packaging and Shipping

Each layer of our tubes is separated by wooden strips, rubber pads, foam boards, or plastic gaskets to prevent damage to the fins during transportation.
We offer sea, air, and land transportation options, ensuring each package has clear labeling and a traceability code.

application areas

Heat Exchangers: Air-cooled heat exchangers, shell-and-tube heat exchangers, waste heat recovery devices, etc.
Petrochemical Industry: Equipment for processing high-temperature flue gas, hydrocarbon gases, or corrosive vapors.
HVAC&Refrigeration: Air conditioners, condensers, evaporators, etc.
Oil and Gas Industry: Gas compressor coolers, pipeline dehydration systems, etc.

Chemical Composition

Element	C	Mn	Si	Cr	Ni	Mo
304	≤0.08	≤2.0	≤1.0	18–20	8–11	-
316	≤0.08	≤2.0	≤1.0	16–18	10–14	2–3
310	≤0.25	≤2.0	≤1.5	24–26	19–22	-

Mechanical Properties

Property	Tensile Strength (MPa)	Yield Strength (MPa)	Elongation (%)	Hardness (HB)
304	≥520	≥205	≥40	≤201
316	≥530	≥240	≥40	≤217
310	≥520	≥205	≥40	≤217

Possible Alternative Grades

Alternative Grades	Reasons
304L / 316L	Low carbon versions with better weldability
409 / 430	Affordable ferritic stainless steel options
Alloy 600 / 625	Suitable for extreme temperatures and corrosive media