Brown Fintube Hairpin Industrial Boiler Finned Laser Welding Tubes for Heat Exchangers

Material / Product Description

Brown Fintube hairpin tubes are longitudinally finned tubes typically produced via resistance welding (or in more advanced designs via laser welding) where fins are welded onto a base tube to form a compact, high-efficiency heat transfer element. The “hairpin” geometry refers to U-bend or double-leg configurations, making the fins part of compact counterflow or multi-tube heat exchangers (hairpin heat exchangers).

These finned tubes are designed for industrial boilers, economizers, waste heat recovery, gas heaters, and other high temperature / high pressure heat exchange applications.

Specifications

Chemical Composition

Below is a sample table comparing the chemical compositions of five analogous finned-tube base materials / grades commonly used in boiler or heat exchanger service. The fin material is often the same type or compatible alloy.

These base steel grades are illustrative. The finned tube may use similar or matching fin alloy. Exact chemical compositions should be referenced from the applicable spec / mill certificate.

Mechanical Properties

Here is a comparative table of typical mechanical properties (at ambient temperature) of the same or analogous base tube materials / grades.

These values are indicative and depend on heat treatment, wall thickness, and manufacturing tolerances. Always rely on mill test certificates or standard references.

Key Features

• High thermal efficiency: The fins increase external (or internal) surface area, accelerating heat transfer and reducing required tube length or shell size.

• Laser welding bond: In finned tubes manufactured by laser welding, full penetration, continuous weld, and minimal heat-affected zone improve fin-to-tube bonding, reduce thermal resistance and enhance corrosion resistance.

• Compact “hairpin” geometry: The U-bend or dual leg arrangement enables compact counterflow designs, reduces the need for expansion joints, and saves footprint.

• High pressure / high temperature capability: Robust welding and material choice allow operation under demanding boiler or process conditions.

• Ease of maintenance: The hairpin configuration allows easier access, inspection, and cleaning relative to long straight bundles.

Governing Standards

Depending on region and application, the following standards may apply:

• ASTM / ASME: e.g., ASTM A213, ASME Boiler & Pressure Vessel Code (B & PV) for seamless ferritic and austenitic tubes

• EN: European standards for steels and heat exchangers

• GOST / Russian: equivalent specifications in Russian / CIS markets

• JIS: Japanese Industrial Standards

• GB: Chinese national standards (e.g. GB for steels, tubes)

The finned tube manufacturer must ensure compliance to the applicable standard (material, dimensional tolerances, pressure test, nondestructive exam).

Application Fields

Broad Application Areas

• Power generation (boilers, economizers, waste heat recovery)

• Petrochemical & chemical processing

• Oil & gas

• HVAC / industrial heating / steam systems

• Food / pharmaceutical process heating

• Heat recovery / regenerative systems

Specific Applications

• Boiler economizer: Brown fintube hairpin tubes are used to recover residual heat from flue gases before stack, improving efficiency.

• Waste heat boiler / heat recovery: In industrial plants where hot gases or streams need to be cooled or heat recuperated.

• Gas heaters / superheaters: As part of gas-to-gas or gas-to-fluid heat exchangers.

• Process heaters in chemical plants: Where a fluid must be heated or cooled efficiently in a compact footprint.

• Air preheaters / flue gas heat recovery: Finned tubes help to boost heat exchange between flue gas and incoming air or process streams.

Q: Are you trading company or manufacturer ?

A: manufacturer,also can do trading.

Q: How long is your delivery time?

A: Generally speaking,it is 10-15 days if the goods are in stock,or it is 30-40 days if the goods are not in stock,

it is according to quantity.

Q: Do you provide samples? is it free or extra ?

A: Yes, we could offer the sample for free charge but need pay the cost of freight.

Q: What is your terms of payment ?

A: Payment<=2000USD, 100% in advance. Payment>=2000USD, 30% T/T in advance ,balance before shippment.

If you have another question, pls feel free to contact with me.

Who We are ?

-------A professional steel pipes materials inventor, manufacturer and solution provider
Torich International Limited is a professional manufacturer and exporter of steel pipes materials. It is an international marketing and sales company specialized in steel tubes, which holds the factories of Seamless Steel Tubes with Carbon and Alloy Steel Grade, Welded Precision Steel Tubes,DOM Steel Tubes, Seamless & Welded Stainless Steel Tubes with Nickel and Alloy Steel Grade.
Our factory was established since 1997, with the name of TORICH INTERNATIONAL LIMITED. The factories’ technicians are of great engineering experience in steel pipe industry for more than 20 years, which are in great command of production technology for Cold Drawing and Cold Rolling. So we have strong technician team and manufacturing capability.

What products we do?

------- Invent and produce various Precision Steel Pipes

Our steel pipes cover the following ranges:
Seamless Precision Steel Pipes

Bearing Steel Tubes
Welded Precision Steel Pipes, with DOM production
Seamless Heat Exchanger Steel Pipe
Seamless Boiler Steel Pipes

Honed Tubes

Hydraulic Cylinder Steel Tubes

Hydraulic Telescopic Cylinder Tubes
Seamless Structural Steel Pipes
Seamless Mechanical Steel Pipes
Seamless Alloy Steel Tubes & Pipes
Seamless Stainless Steel tubes
Welded Stainless Steel Tubes
Seamless Stainless Steel Tubes & Pipes
Welded Stainless Steel Tubes & Pipes
Seamless Carbon Steel Tubes & Pipes
Nickel Alloy Steel Tubes & Pipes

What TORICH do:
1. Producing Steel Tubes
2. Selling both on Domestic and International Market
3. Precisely Targeting Customers’ Requirement- Sourcing the right factory for right products for Customers

Products Application:
Oil Cylinders
Air Cylinder, 
Automotive Cylinder Liners
Boilers, Pressure Vessels
Shell & Heat Exchangers
Jack Lifting
Telescopic Systems
Pneumatic Cylinders
Agricultural Machineries

Size range is: 
O.D. 4-350mm, 
W.T. 0.5-30mm, 
Length: according to customer’s requirement and agreement
 

Steel Grade:
Carbon Steel Grade:
ST35.8, ST37.0, ST44, ST52;
E155, E195, E215, E235, E275, E355;
195GH, P235GH, P265GH, P195TR1, P195TR2, P235TR1, P235TR2, P265TR1, P265TR2;
SAE1010, SAE1020, SAE1026, SAE1035, SAE1045;

Carbon steel tube: SA178, A179, A192, A210, SA213, SA214, etc.
Alloy Steel Grade:
T2, T5, T9, T11, T12, T17, T21, T22, T91,T92, 15Mo3,16Mo3, 13CrMo44;
SAE4130, SAE4140, 40Cr, 40Cr4, 10CrMo910, 12CrMo910, 11CrMo910,
25CrMo4, 35CrMo, 35CrMo4, 42CrMo4, 34CrMo4, 20MnV, 20MnV6,20CrMn;
Carbon steel tube: A179,A192,A210,DIN17175,etc.

Bearing Steel Grades:
GCr15 52100 suj2 suj3 100Cr6 SKF3S SKF3S 20CrNiMo 8620H 4118H;

Nickel Alloy Grade:
N02200/2201, N04400, N06600, N06601, N06625, N06852, N06219, N06690, N08800/8810/8811, N08825, N08028, N08535, N08904, N08925, N08926, N010276, N06022, etc.

Austenitic/Super Austenitic Stainless Steel Grade:
304/304L, 316/316L, 314, 321, 347H, 316Ti, 316LMod, 317L/N, 310S, 253MA, 330, 904L, S31254, XM-19, etc. 

Ferrite/Martensite Stainless Steel Grade:
TP410, TP405, TP420, TP430, TP430Ti, TP403, TP409, TP444, TP439, TP446, etc. 

Duplex/Super Duplex Stainless Steel Grade:
S31803, S32304, S31500, S32550, S32750, S32760, etc. 
Corporate Culture:
We focus on Quality First, Quality Traceability, and Quality Stability!
We focus on Customer First, People First, and Quality-Oriented!
Success:
First factory started in 1997, in the name of Torich , now covers 50000 square meters of factory building, with more than 100employees, and over 45 million RBM assets.
In 2008, we started the company of Torich International Limited for international business and marketing.
Welcome partners from all over the world for long term cooperation!