SA214 ERW Carbon Steel L/LL/KL Type Fin Tube OD25.4X1.5WT
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SA214 ERW Carbon Steel L/LL/KL Type Fin Tube OD25.4X1.5WT

SA214 ERW Carbon Steel L/LL/KL Type Fin Tube OD25.4X1.5WT: The fin strip is welded continuously and spirally wound onto a polished bare tube. And the tube and fins are bonded together by using high frequency resistance welding technique; We produce both solid plain and serrated helical welded steel finned tube. And also, all spiral welding tubes could be bent in the middle or at the end of fin tubes, we call it Hairpin tubes.

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Product Description

SA214 ERW Carbon Steel L/LL/KL Type Fin Tube OD25.4X1.5WT

1.Product Details:

Place of Origin:


Brand Name:




Model Number:


2.Payment & Shipping Terms:

Minimum Order Quantity:




Packaging Details:

(1) Steel frame case sealed by plywoods with each end of fin tubes capped. (2) Solid fumigated wooden box with each end of fin tubes capped.

Delivery Time:

Ex-work with 1 month after order.

Payment Terms:

T/T, L/C

Supply Ability:

Daily capacity up to 5,000 Meters


3.Detailed Product Description

Company Type:


Fin Tube Type:

Knurled Fin Tubes Or KL Type Fin Tube

Fin Type:

Solid Fins, Perforated Fins

Tube Material:

Carbon Steel, Stainless Steel, Alloy Steel, Copper Etc...

Fin Material:


Tube OD:

2'' Max.

Tube Length:

No Limit

Fin Height:


Fin Pitch:

10mm Max


Up To 5000 Meters/day

High Light:

fintube, aluminum fin tube

SA214 ERW Carbon Steel , OD25.4X1.5WT  KL Type Aluminum Refrigeration Tube



Protection of Ends

Both bare ends of Knurled Footed Fin Tubes shall be Zinc or Aluminum metalized applied by an electro spray arc system coating.


General KL Type production capacity

General specifications of KL Type fin tubes

Finning Facility: 7 finning machines;

Daily capacity up to 5000 meters;

Tube OD: 50.8mm max.

Tube Length: 18,000mm max.

Fin Height: 16.5 mm max.

Fin Thickness: generally 0.4mm ~0.6mm

Fin Pitch: 2.1 mm (12FPI) min.


Manufacturing process

The fin strip (normally aluminum) is folded into an ‘L’ shape and wound on to the base tube surface under tension. The surface of base tubes must be knurled before tension.The feet of the fins are joined together and cover the finned surface.


Acceptance Criteria

 API Standard 661(Air-Cooled Heat Exchangers for General Refinery Service) or the delivery conditions (TDC) of clients.


Quality Test

The Overlapped Knurled Footed Fin Tubes quality is assured by hydrostatic or pneumatic tests, eddy current tests and tensile tests in order to verify the mechanical bonding between inner and outer tubes.


Accessories of KL type fin tubes

Tube Support Box, Clamp or Spacer Box (Materials: Aluminum, Zinc or Stainless Steel).


5.Delivery condition

Tube ends are square cut, free burrs, internally dried and air blown clean, externally coated with varnish at both ends of Overlapped Knurled Footed Fin Tubes.

The desiccants are put into each package for continental transportation as well.



The common application fields are:

■ Heat exchangers units for power plant(electric, nuclear, thermal and geothermal power plants);

■ High corrosive systems (condensers, evaporators, sea water desalinations, fertilizing, urea systems, ammonia, gas, corrosive acids);

■ The petroleum, chemical and petrochemical industries;

■ The food processing and refrigeration industries;

■ Natural gas treatment;



Knurled footed tube is combined with two different materials.


General Materials

Popular ASTM Materials

Core Tube Material

 Carbon steel,

 Low-alloy steel,

 Stainless steel,

 Brass, copper,

 Cooper-nickel alloys,

 Aluminum bronze,

 Nickel alloys.

1. Carbon Steel: A179, A192,SA210 Gr A1/C,A106 Gr B

2. Stainless Steel: TP304/304L,TP316/TP316L           

3. Copper:UNS12200/UNS14200/UNS70600,

                 CuNi70/30,CuNi 90/10

4. Titanium: B338 Gr 2

Fins Material 

Aluminum & Copper.

1. Aluminum(Alu.1100,Alu.1060)

2. Copper.


All dimensions are in Inches and specification upon your requests.

Tube OD

Fin Height

Fin Thickness

Fins per Pitch(Density)



.015/.016/ .020

6, 7, 8, 9, 10, 11, 12



.015/.016/ .020

6, 7, 8, 9, 10, 11, 12



.015/.016/ .020

6, 7, 8, 9, 10, 11, 12

1 1/4


.015/.016/ .020

6, 7, 8, 9, 10, 11, 12

1 1/2


.015/.016/ .020

6, 7, 8, 9, 10, 11, 12

Please email for us for more information.


8.Competitive Advantage:

■ We have more than 10,000 square meters workshop, including 7 finning machines, daily capacity up to 5,000 meters.

■ The Knurled Footed Finning machines are designed and assembled by ourselves and we can offer you finning machines and all accessories etc...

■ This method of manufacturing KL Footed Type enables us to place the finning on a very thin-walled tube with is particularly desirable when using high value alloys (titanium, stainless, copper, nickel).The tube can withstand a temperature of up to 150°C without the risk of atmospheric corrosion or thermal stress.

■ KL TYPE fin tubes: the knurling process is strengthened the adhesion and reduce the tendency for fin loosening; and it is preferred when used in slightly more aggressive conditions. Maximum operating temperature: 250°C.

■ After wrapped the fin strip, the fin foot is also knurled on the base tube to increase the bonding between tube and fin. For this reason, KL type of fin construction ensures better heat transfer characteristics than in the case of type L and LL.






How many days you need to install the equipment?                                  

30 days.


How many staff abroad you sent to install the equipment?

3 persons.


Can I delivery the goods from other supplier to your factory? Then load together?



Can the equipment be installed under hot weather?



Can Your products be installed under the cold weather?



Can I only buy some spare parts from you?



Will you participate in the exhibition?

Will do .


How long it takes you to provide the designing options for us?

1-2 working days .


What is your products standardization?

National standard .


How do you pack the equipment?

Wooden box .


Can you can design the equipment according to our size?



How many years have your company made this kind of equipment?

13 years .


Which certificate do you have for your equipment?



Do you have any real project pictures of the equipment?



How far is your factory from the airport?

50 minutes .


How long it will take from guangzhou to your factory?

2 hours by plane, 9-10 hours by high-speed rail.


Do you provide sample? Free or charge?

Samples can be provided, charges are required.


What is your term of payment?

30% prepaid, paid in full before shipment.


What is your MOQ?

100 pcs .


Are you a trading company or a manufacturer?



How long is your delivery time?

40 days .


How many production lines in your factory?

7 high-frequency resistance welding spiral fin tube production lines, 

3 tube bending machines, 

18 rolling extruders,

12 aluminum fin winding and inlaying machines.

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