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HFW sprial SERRATED finned tubes apply in boilers, economizers

Base tube material: SA312 TP316 OD114.3mm X13.5mm THK X16000mm LG
Fin Material: 18Cr8Ni THICKNESS 1.5mm, HEIGHT12.7mm, 118FPM,

Manufacturing Process:
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.

Material: Stainless Steel+Stainless Steel, Carbon Steel+Carbon Steel, Alloy+Alloy etc.
Bare tube OD: 16-219mm Fin Pitch: 3-25mm Fin Height: 5-30mm Fin Thick: 0.8-3mm

Description of the inspections carried out
Following documentations should be reviewed & endorsed:
1. Declaration of conformity,
2. Inspection plan,
3. Welding book(WPS & PQR),
4. Finned tubes examination reports
(dimension & visual inspection, hardness test report, tensile test report),
5. Test samples sheet,
6. Incoming inspection report,
7. Inspection certificate for bare tube,
8. Quality test certificate for steel strip,
9. Iinspection & Guarantee certificate for finned tube,
10. Product inspection report.


Base tube
(OD) mm

Fin Pitch


Min Max Min Max Min Max
Extruded aluminum finned tube 12.7 51 2.1 10 0.5 20
L/LL/KL aluminum finned tube 19 51 2.1 3.2 0.5 15
Embedded aluminum finned tube 19 42 2.3 3.2 0.5 15
Low finned tube 12.7 32 0.8 2 0.5 20
Spiral fin tube 12.7 70 0.5 20
ERW HF spiral fin tube 16 219 3 25 0.5 28
ERW HF spiral serrated fin tube 16 219 3 25 0.5 28

Serrated width(mm)
10 min~26 max

Serrated depth(mm)
4 min~16 max

ERW studded tube 89 200 16 50 2 15
DC ERW H/HH fin tube 25 51 9 25 1 15
H/HH fins

60 min-150 max

1.5 min~4 max

30 min~50 max

Application: The High Frequency Resistance Welded Helical Fin Tubes are widely applied in fired heaters, heat exchanger, boilers, economizers, pre-heaters, heat pipes, heaters etc…

Capacity: Seven ERW High Frequency fining lines, daily capacity around 50 tons,length≤28meters;

Products&Inspection Deatails:

Packaging: sea worthy with plastic cap for each edge of core tube , finned tubes shall be put on the metal frame with wooden walls and plastic layer be considered between tubes rows to avoid damage and deformation of the fins

About Our main business
A------ DR(Extruded) / L(Wrapped) / LL(Overlapped) / KL-KLM (Knurled) / G(Embeded) Fin Tube;
High Frequency Welding Fin Tube,Studded Tube, H/HH/Square Fin Tube,Longitudinal Tube;
Elbows, Low Fin Tube,Spiral Tube, U bend , Corrugated Tube.
About Price terms
A------ It could be EXW, FOB,CIF,CNF
About Payment Term
A------ We usually accept payment by T/T in advance or by L/C available against draft at sight
About Lead Time
A------ Usually it takes about 35-45 days after we received your confirmation.
However, it would depend on our production line schedule(the timing clients place order)and the complication of the item.
About Quality Control
Incoming inspection report for raw material including bare tube/ / alu. strip / steel strip
Mill test cetification for bare tube
Mill test cetification for fin ( / alu. strip / steel strip)
Mill test cetification for finned tube
Finned tubes dimension & visual inspection reports
About Sample
A--- If you are interested in our above products, please contact us.
We can provide small samples in store for you, and you are welcome to visit our factory
Our moulds can be customized,you could kindly leave an inquiry to know more details about price, packing and shipping.

how to contact us?


Cangzhou Datang Steel Pipe Co., Ltd All Right Resevered.