TP304/304L/TP316/TP316L/TP347/TP321 Seamless stainless Steel Square Rectangular Double H welding Fin Tubes pipe finned tubes pipe tubings fintubes for Economizer
We are professional TP304/304L/TP316/TP316L/TP347/TP321 Seamless stainless Steel Square Rectangular Double H welding Fin Tubes pipe finned tubes pipe tubings fintubes for Economizer from china


General fin tube production capacityGeneral specfications of HH(Double H) fin tube

Production Facility: 6 finning machines;

Daily capacity up to 20 tons;

Tube OD: 51 mm max.

Tube Length: 18 meters max.

Fin Thickness: 1.5mm ~3.5mm

Fin Pitch: 10mm Min.


Manufacturing process

Square or Rectangular Fins are welded on two steel base tubes. We call it Double H (HH) fin type.


Manufacturing Process
Square or Rectangular H Fins are welded on a steel base tube. We call it H Fin Type Tubing.

Acceptance Criteria
Approved drawing and the delivery conditions (TDC) of clients.
Additional Services
Tube swaging, elbows, bends (90° / 180° or as per client s design).
Quality Tests
The Square or Rectangualr H Finned Tube quality is 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.
Surface Coating
Outside-Red oxide zinc phosphate primer and inside volatile corrosion inhibitor (VCI) in water soluble tablet form.
Delivery Condition: Tube ends are square cut, free burrs, internally dried and air blown clean, externally coated with varnish at both ends of Square or Rectangualr Fin Tube.

  1. Economizers ,
  2. Heat exchangers
  3. Marine boilers


  1. Economizers
  2. Boilers
  3. Heat exchangers




ItemsGeneral MaterialsPopular 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...



Why we choose HH welding fin tube: High efficiency, minimum power loss, easy cleaning.

Descriptions of HH Fin Tube

Popular Specifications we make

Tube OD(mm)

   25mm to 51mm

Tube Wall thickness(mm)

   2.5mm Min.

Tube length(mm)

   18000mm Max.

Fin thickness(mm)

   1.5mm to 3.5mm

Fin pitch(mm)

   10mm Min.

Please email us for more information.



Competitive Advantage:

  1. We have more than 10,000 square meters workshop, including 6 H-FIN or HH-FIN TYPE finning machines, daily extrusion capacity up to 20 tons.
  2. Shanghai Port is our nearest seaport and airport, less than 2 hours drive away from our workshop, convenient transportation.
  3. The Square or Rectangular HH Fin Tubes are the preferred tube choice for high pressure boilers.
  4. Fins can be manufactured by stamping process in almost any shape and size.
  5. In-line fin and tube spacing allows for cleaning with excellent choice in sooting or fouling atmospheres.
  6. Fin height and spacing are limited only by heat transfer considerations.
  7. Fins and tubing can be similar or dissimilar metals.
Products Search