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3.5mm Welded Fin Tubes

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3.5mm Welded Fin Tubes
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Fin Tube Type: HH Fin Tube Or Double"H" Fin Tube
Surface Treament: Varnish /red Or Black Painting
Tube OD:: 51 Mm Max.
Fin Density: Min. 10mm
Fin Thickness:: 1.5mm ~3.5mm
Fin Pitch:: 10mm Min.
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3.5mm Welded Fin Tubes


1.5mm H Fin Tube


Density 10mm Welded Fin Tubes

Basic Infomation
Place of Origin: China
Brand Name: DELLOK
Certification: CE. ISO,EN10204. 3.1 Cert.
Model Number: HH FIN
Payment & Shipping Terms
Packaging Details: (1) Waterproof steel frame bundle package;(2)Steel frame case sealed by plywoods with each end capped.
Delivery Time: Ex-work within 5 weeks after order.
Payment Terms: L/C, T/T Contact us for details
Supply Ability: 60000 meters month
Product Description

3.5mm Welded Fin Tubes


SA210 Gr. A1 Seamless Carbon Steel , Rectangular 'Double H' welding Fin Tube for Economizers



More Tube Materials
ASTM A106 / 106M : Seamless Carbon Steel Pipe for High-Temperature Service
ASTM A179 / A179M : Seamless Cold-Drawn Low-Carbon Steel Heat-Exchanger and Condenser Tubes
ASTM A192 / A192M : Seamless Carbon Steel Boiler Tubes for High-Pressure Service
ASTM A210 / A210M : Seamless Medium-Carbon Steel Boiler and Superheater Tubes



Square or Rectangular Fins are welded on two steel base tubes. We call it Double H (HH) fin type. The surface of the fin is outside-red oxide zinc phosphate primer and inside volatile corrosion inhibitor (VCI) in water soluble tablet form. And all of them are assured by hydrostatic or pneumatic tests, eddy current tests and tensile tests in order to verify the mechanical bonding between inner tubes and outer fins. The delivery condition of this fin are ends square cut, free burrs, internally dried and air blown clean, externally coated with varnish at both ends of Square or Rectangualr Fin Tube. Besides, we provide additional services such as Tube swaging, elbows, bends (90° / 180° or as per client's design).


Acceptance Criteria

Approved drawing and the delivery conditions (TDC) of clients.



1. Economizers ,

2. Heat exchangers

3. Marine boilers

Product Details

Tube details:

Tube OD: 73 mm max.

Tube Length: 18 meters max.

Fin Thickness: 1.5mm ~3.5mm

Fin Pitch: 10mm Min.

Production Capacity:

Daily capacity up to 20 tons;





General Materials

Popular ASTM /ASME Materials

Core Tube Material

Carbon Steel
Alloy Steel
Heat Resistant Steel,
Stainless Steel

1. Carbon Steel: A106 / A179 /A192 / A210 etc...
2. Stainless Steel: TP304/304L,TP316/TP316L, TP347 etc...
3. Alloy Steel: P5,T5,P9,T9,T11,T22


Carbon Steel
Stainless Steel

1. Carbon Steel
2. Stainless Steel:
TP409/410,TP304/304L,TP316/TP316L etc...



Competitive Advantage:

  1. Shanghai Port is our nearest seaport and airport, less than 2 hours’ drive away from our workshop, convenient transportation.

  2. The Square or Rectangular HH Fin Tubes are the preferred tube choice for high pressure boilers.

  3. Fins can be manufactured by stamping process in almost any shape and size.

  4. In-line fin and tube spacing allows for cleaning with excellent choice in sooting or fouling atmospheres.

  5. Fin height and spacing are limited only by heat transfer considerations.

  6. Fins and tubing can be similar or dissimilar metals.

3.5mm Welded Fin Tubes 0

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Get in touch with us
Contact Person : Pax Yang
Tel : +862569521609
Fax : 86-25-6952-5709
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