What is H-type finned tube?
H-type finned tubes are also called square finned tubes. The H-shaped finned tube is to weld two steel sheets with a circular arc in the middle symmetrically with the light tube to form fins. The front of the fin is shaped like the letter “H”, so it is called H-type finned tube.
H Finned Tube is divided into single H Finned Tube and Twin H Finned Tube (HH or Doule H finned tube), also known as Rectangular Finned Tubes. H Finned Tube is made by welding square or rectangular H fins to a steel base tube.
Twin H Finned Tube (HH or Doule H Finned Tube)
The fins are divided into two symmetrical halves, the tube wall is pressed from both sides, and the tube wall is welded by resistance welding, leaving a certain gap in the middle; two round tubes can share a set of fins, called Twin H Finned Tube.
Single H Finned Tube
The fin is divided into two symmetrical halves, which press the tube wall from both sides, and are welded to the tube wall by resistance welding, leaving a certain gap in the middle; there is only one round tube in the middle, which is called Single H Finned Tube.

How to produce H-type finned tubes?
H Finned Tube is made by welding square or rectangular H fins to a steel base tube.
The fins formed by stamping and shearing of the steel plate are manually coded into the sheet automatic unloading hopper, and the feeding cylinder realizes automatic unloading. At the same time, the steel pipe is transported to the welding position, and the horizontal pushing cylinder pushes the electrode clamping mechanism to realize automatic welding. The electrode clamping mechanism is the key part of the welding machine, and the electrodes on both sides are equipped with material receiving and pneumatic positioning mechanisms. And it is pushed centripetally by the push cylinder, and the fins automatically enter the welding position, clamping and welding, and realize the welding of the fins on both sides and the steel pipe. After the welding is completed, the clamping is released, the finned tube is manually removed, and the steel tube moves forward. The parallel automatic welding of steel pipes and fins can well meet the quality and efficiency requirements of finned tube welding.

H Finned Tube is made by welding square or rectangular H fins to a steel base tube.
H-type finned tube is a heat exchanger element used for waste heat recovery, including base tube and fin group; the base tube has a certain length, and several parallel fin groups are arranged along the axis of the base tube and welded to the outer wall of the base tube ; There is a spoiler rod on the windward side of the fin surface, a spherical convex structure is arranged on the base pipe side at the center of the fin surface, and a small wing vortex generator is arranged on the leeward side of the fin surface; the direction of the flue gas flow does not change, and the ball is arranged The fins of the convex and spoiler rods can change the airflow movement state, aggravate the disturbance, reduce the thickness of the heat stagnation layer, and achieve the purpose of enhancing heat transfer to a certain extent.

Surface coating
External red oxidized zinc phosphate primer and internal Volatile Corrosion Inhibitor (VCI) in water-soluble tablet form.

Quality Control for Square Finned Tube
The quality of Square or Rectangualr H finned tubes is assured by hydrostatic or aerodynamic testing, eddy current testing and tensile testing to verify the mechanical bond between the inner tube and outer fins.

Delivery condition:
Tube ends are square cut, free burrs, internally dried and air blown clean, externally coated with Anti-rust at both ends of high frequency welded spiral fin tube.

H-type finned tube material and size: