KL-footed finned tube
Base tube surface is knurled before fin winding.
Stronger mechanical bonding between fin and tube.
Improved heat transfer efficiency due to better contact.
Higher resistance to fin loosening during operation.
Suitable for higher temperature and vibration conditions.
KL Type Finned Tube (Knurled Finned Tube)
The KL type finned tube, also known as the knurled finned tube, is produced by first forming a knurled pattern on the outer surface of the base tube, followed by fin winding. In some cases, the knurling and finning processes are carried out simultaneously on the same machine, where the front tool creates the knurled surface and the rear tool performs the fin wrapping.
The knurled surface increases the friction between the fin strip and the base tube, which improves bonding strength and reduces the risk of fin loosening during operation.
Typical Technical Parameters
Base tube outside diameter: 16 mm to 50.8 mm
Wall thickness: 1.5 mm to 4.0 mm
Fin height: 6 mm to 16 mm
Fin thickness: 0.3 mm to 0.8 mm
Fin pitch: 2 fins per inch to 11 fins per inch
Finning ratio: 6 to 12
Tube length: up to 18 meters
Maximum operating temperature: up to 250°C
Maximum operating pressure: up to 3.2 MPa
Features
The contact between the fin and the tube is significantly enhanced due to the knurled surface, resulting in relatively low contact thermal resistance and good heat transfer performance.
The enlarged contact area ensures that the fin is tightly and securely bonded to the tube, improving mechanical stability under vibration and thermal cycling conditions.
The structure provides good resistance to atmospheric corrosion, and the overall performance remains stable during long term operation.
Applications
KL type finned tubes are widely used in air cooled heat exchangers, air heaters, radiators, and other heat transfer equipment in industries such as petrochemical, power generation, HVAC, and general industrial cooling systems.
FAQ：
1. Are you manufacturer or trader?
We are titanium tube manufacturer producing from melting titanium sponge, extruding hollow billet, rolling to finished tubes and destructive test mechanical test, chemical analysis, non-destructive tests like Ultrasonic test, Eddy current test, Pneumatic test and hydrostatic test are available in house.
Beside titanium tube production line, we also have finning lines. Our factory is still expanding and will invest more on finning facilities.
2. How many workers are there in your factory?
Till 2026, we have 210 staffs.
3. How fast can you deliver the materials?
It depends on the size and quantity, the standard time is 45 days.
4. What is the payment term you can offer?
Standard term is 30% T/T in advance, balance before shipment. L/C is also acceptable. It can be discussed based on different project.
5. Can you provide third party inspection service?
Yes, we can arrange BV/TUV/SGS/LR etc inspection. EN10204 3.2 certificate can be provided.
6. What is your annum turnover?
For 2025, we have had 100 million US dollars turnover for our whole group including factory and the export company.
7. What is the percentage of your export and domestic market share?
Approximately 30% of orders are for export and 70% are for domestic market. However we are aiming to increase more investment on export and hopefully the percentage can be 50-50 in the near future.
8. What country are your clients from?
We are working with overseas clients from Europe like Netherland, France, Italy, Spain etc, USA, Korea, Japan, Indonesia, Vietnam, Singapore, Chile, Argentina, Brasil, Russia, Belarus, Uzbekstan. Basically we work with clients from all over the world. We welcome every client to approach us for inquiry, and we will be ready to serve our clients. We also welcome our clients to visit our factory for onsite audit.
