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A Comprehensive Guide to Finned Tube Types |Heat Exchanger

09-23-2025 09:37 AM CET | Energy & Environment

Press release from: Shanghai T.S. Industrial Co.,Ltd

A Comprehensive Guide to Finned Tube Types |Heat Exchanger

Finned tubes are indispensable core components within heat exchangers across various sectors, including power engineering, chemical production, petroleum refining, air conditioning engineering, and refrigeration. By adding different types of fins to the internal or external surface of a base bare tube, the heat transfer area is significantly increased, leading to a substantial enhancement in heat exchange efficiency. Particularly in gas-liquid heat exchange scenarios, finned tubes effectively balance the difference in heat transfer coefficients between the gas side and the liquid side, making them a critical component for high-efficiency heat exchangers.

The Three Core Functions of Finned Tubes:
• Heat Transfer Enhancement
• Balancing Heat Transfer Efficiency
• Improving Economy and Compactness

Finned tubes come in a diverse range of fin shapes and constructions, each designed with specific application scenarios and performance characteristics in mind.

These include:
• Crimped finned tube
• L/LL/KL/Perforated L Type finned tube
• Extruded solid/serrated finned tube
• Embedded G type finned tube
• Laser weld finned tube
• High frequency welded solid/serrated tube
• Square H/double HH finned tube
• Studded pipe
• Longitudinal finned tube
• Brazed/hot-dipped galvanized elliptical finned tube
• Low fin tube
• Cast iron square finned tube
• Brazed single row flat finned tube
• Furnace wall panel fin tube

Finned Tube Classification
1. By Fin Cross-Sectional Shape
1Circular Shape
• Crimped
• L/LL/KL/Perforated L Type
• Extruded/Serrated Finned Tube
• Embedded G Type
• Laser Weld Finned Tube
• HFW Solid/Serrated Finned Tube
• Longitudinal Finned Tube
• Studded Pipe
• Low Fin Tube
• Inner Finned Tube
• H/HH Type

2Rectangular Shape
• Oval Finned Tube
• Single Row Flat Finned Tube
• Cast Iron Square Finned Tube

2. By Tube Shape/Configuration
1Finned Tube Coil
A finned tube coil is formed by bending a finned tube into a coiled configuration. Compared to straight finned tubes, it offers a more compact design, saving significant space.

2Straight Finned Tube

3U Bend Finned Tube
The structure of the U-bend finned tube is unique. A continuous metal tube is bent into a 180-degree U-shape, resulting in two parallel straight sections connected by a curved return bend. Fins are then added to the external surface of the straight sections.

3. By Manufacturing Process
1By Winding
Process: Metal strip (typically aluminum or copper) is spirally wound onto the exterior surface of a base tube (typically steel, copper, or stainless steel) under specific tension using specialized winding equipment, forming a helical fin structure.

Features: Cost-effective manufacturing.
• Crimped Finned Tube
• L/LL/KL/Perforated L Type

The primary difference between L, LL, and KL types lies in the method of securing the fin root to the base tube.

2By Welding
Process: This type permanently bonds the fins to the base tube via a welding process. The core principle involves replacing mechanical tension bonds with a metallurgical bond, which eliminates contact thermal resistance and achieves superior heat transfer performance and structural integrity.

Features: High strength and excellent heat transfer due to metallurgical bonding.
• Laser weld Finned tube https://www.lordfintube.com/laser-welded-carbon-steel-finned-tube_1290.html
• Square H/Rectangular HH finned tube https://www.lordfintube.com/double-s-type-fin-tube_1162.html
• Studded pipe https://www.lordfintube.com/studded-tubes_1163.html
• Longitudinal finned tube
• Inner finned tube
• Brazed elliptical finned tube
• Single row plat finned tube

Among various welding processes, high-frequency resistance welding (HFW) is the most widely used manufacturing method. HFW finned tubes can be further divided into solid fin and serrated fin types:
• HFW solid finned tube
• HFW serrated finned tube

4By Casting
Process: Cast square finned tubes utilize an integral casting process where the fins and the tube body form a seamless whole.

This fundamentally prevents any form of "crevice corrosion" and "contact thermal resistance," ensuring optimal corrosion resistance and long-term structural integrity.

5By Rolling
Process: This process uses specialized rolling mills to extrude fins directly from the external metal of a bare tube via roll-forming.

The rolling process can produce fins that are thicker at the root and thinner at the tip. This shape better conforms to heat conduction principles (higher heat flux density at the root), further optimizing heat transfer efficiency while ensuring mechanical strength at the fin root.

• Extruded finned tube
• Extruded serrated finned tube
• Low fin tube

6 By Expanding Tubes
Process: This process is typically used specifically for hot-dipped galvanized elliptical finned tubes. First, the fins are slipped onto the oval base tube. Then, a tube expansion process is used to mechanically fix the fins to the tube surface. Finally, the assembly undergoes hot-dip galvanizing.

4. By Fin Material
1Aluminum Fins: Lightweight, high thermal conductivity.
• Extruded/serrated finned tube
• Crimped finned tube
• L/LL/KL/Perforated L Type
• Embedded G Type finned tube
• Single row flat finned tube
• Oval finned tube

2Copper Fins: Excellent thermal conductivity and corrosion resistance.
• Extruded finned tube
• Crimped finned tube
• L/LL/KL/Perforated L Type
• Embedded G Type finned tube https://www.lordfintube.com/copper-embedded-finned-tube_1335.html
• Laser weld finned tube
• Longitudinal finned tube
• Inner finned tube
• Low fin tube

3Steel Fins: High strength, high-temperature resistance.
• Laser weld finned tube
• HFW solid/serrated finned tube
• H/HH type
• Studded pipe
• Longitudinal finned tube
• Oval finned tube
• Inner finned tube
• Low fin tube
• Cast Iron Square Finned Tube

Company Name: Shanghai T.S. Industrial Co. Ltd
Contact Name: Miss Estela
Address: No.2, Lane 1588 Youyi Road, Baoshan, Shanghai, The P. R. of China. Post. 201999
Email: estela@lordfintube.com
Website: https://www.lordfintube.com/

Shanghai T.S. Industrial Co., Ltd is a leading company specializing in Finned tubes, U bend tubes, and Tube sheets used in Heat Exchangers, Boiler Economizers, Coolers, and Heaters. We focus on supplying custom fin tubes, finned pipes, and tube sheets in various material configurations that enhance heat transfer rates and reduce operating costs.

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