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  Double H Finned Tube

H / double H fin tubes (TYPES“, Double S“)

Steel H Pairs of parallel shaped steel fins are resistance welded to the single pressure tubes (pipes) surface under very carefully controlled conditions.The purpose build welding machine ensures very precise indexing along the entire length of the tubes (pipes) and exact parallel attachment.


Double H h, double H / double H fin tubes

A development of the single tubes (pipes) version, the 'Double H' design has the steel fins welded onto two tubes at the same time. For applications with cleaner gases the use of 'Double H' can reduce the number of supports required due to its inherent stiffness.


H /HH fin tubes

ApplicationIt is widely used for Heat exchanger, Air-conditioner, Refrigerator, Economizer

And other parts of Heat Industry.

Material of base pipeCarbon steel, Alloy steel, Aluminium or Stainless

Material of finsCarbon steel, Alloy steel or Stainless

Type of base pipeSeamlesss, Welded

Type of finsH, HH

OD of Base pipes15mm-219mm

WT of base pipes1.5-6mm

Height of fins8mm-30mm

WT of fins0.5mm-3.0mm

Pitch of fins2.0mm-20mm

Length of blank areaaccording to Customer's request.

Length of finned tubes≤ 23m


H/HH fin tubes.


It is widely used for Heat exchanger ,Air-conditioner ,Refrigerator, Economizer

and other parts of Heat Industry.

Material of base pipe Carbon &Alloy steel, or Stainless

Material of fins Carbon &Alloy steel

Type of base pipe Seamlesss,Welded

Type of fins  H or Double H

OD of Base pipes 15mm-219mm

WT of base pipes 1.5-6mm

Height of fins 8mm-30mm

WT of fins 0.6mm-3.0mm

Pitch of fins 2.5mm-20mm

Length of blank area according to Customer's request.

Length of finned tubes ≤23m



As a general guide, spacing of tubes (pipes) centres is usually in the range of 2-3 times the tubes (pipes) O/Dia.

. tubes (pipes) O/Dia. [OD] mm - 31.8 to 57.2

. tubes (pipes) Length [L] Metres - Up to and including 18 Metres maximum

. Vertical Centres [V] mm - 65 to 133

. Horizontal Centres [H] mm - 65 to 178

. Fin Thickness [t] mm - 2.0, 2.5, 3.0 (certain fin shapes can be 1.5mm thick material)

. Fin Density [P] mm - Minimum 10mm, i.e. 100 Fins Per Metre (FPM)

. Fin Shape - Over 75 fin shapes as standard, with new fin shapes continually being developed.

Bespoke fin shapes are produced to suit the design application where feasible.


Base tubes (pipes) Material

Typically Carbon, Corten, Low alloy steels.

Tubes quality / type can be Cold Drawn Seamless [CDS], Hot Finished Seamless [HFS], Electric Resistance Welded [ERW].


Fin Material

Carbon Steel Hot Rolled [HR4], Corrosion resisting steels i.e. Corten.


Manufacturing Process

Square or Rectangular fins are welded on one or two steel base tubes. We call it H and HH or Doule H Fin Type Tubing.



1. Economizers;

2. Heat exchangers;

3. Marine boilers.


Base tube diameter  25mm-73mm

Base tube wall thickness  3.0mm-6.0mm

Fin thickness    1.5mm-4.0mm

Fin pitch   9.0mm-30.0mm

Fin height  15.0mm-45.0mm

Base tube material: Stainless steel, Carbon steel, Alloy, Nickel etc.

Fin material: Carbon steel, Stainless steel, Alloy etc.


   Muxija Corporation Limited
No 2, Lane 1588, Shanghai International Steel Service Center,Youyi Road, Shanghai, The P. R. of China
P.C.:201900  Tel:+ 0086-21-512509100086-21-51250911
Fax: +0086-21-51250912 Email: