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Brazed spiral finned tubes

As a heat exchange element, the finned tube works under high temperature flue gas conditions for a long time, such as boiler heat exchanger with finned tube using a harsh environment, high temperature and pressure and in a corrosive atmosphere, which requires the finned tube should have high performance indicators.
Introduction
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Introduction
Brazed spiral finned tubes are expensive, so an alternative method is often used, where the wrapped steel tube is placed in a zinc bath for overall hot-dip galvanizing. Although the overall hot-dip galvanizing solution does not necessarily penetrate well into the tiny gap between the fins and the steel tube, a complete galvanized layer is formed on the outer surface of the fins and the outer surface of the steel tube. Using the overall hot-dip galvanized spiral finned tube, because of the limitation of the thickness of the galvanized layer (when the galvanized layer is thick, the zinc layer is poorly firm and easy to fall off), coupled with the fact that it is impossible for the zinc solution to penetrate all the way into the gap, the bonding rate between the fins and the steel pipe is still not high. In addition, the heat transfer coefficient of zinc is smaller than that of steel (about 78% of steel), so the heat transfer capacity is low. Zinc is highly susceptible to corrosion in acids and alkalis, sulfides, therefore, the use of galvanized spiral finned tubes is not suitable for the production of air preheaters (recovery of boiler flue gas waste heat).

Finned tubes can be broadly classified into the following categories according to the shape of the fins.
1). Square finned tube (Square finned tube).
2). Circular finned tube
3). Spiral finned tube (spiral finned tube).
4). Longitudinal Finned Tube
5). corrugated finned tube
6). Spiral Serrated Finned Tube (Helical Serrated Finned Tubes)
7). Needle Finned Tubes
8). Integral plate finned tubes (plate fins).
9). Inner finned tube (inner finned tube). And so on.
Product Details
1) Tube OD:25mm~82.5mm;
2) Length : 130mm~18m;
3) fin height : 0mm-16mm;
4) Fin pitch:2.0-5.0mm;
5) finned tube length:0.5m~ 14m;
6) Single metal rolling finned tube: Pure aluminum 1060 /aluminum alloy 6063 the 6061 material;
7) Double metal rolling finned tube: Tube-based protection from the outer layer of aluminum tubes, corrosion-resistant; 
8) Base tube material : carbon steel pipe/stainless steel tube/ copper tube / titanium alloy tube;
9) Package: The aluminum finned tubes are well packed in plastic film in the inner and steel frame in the outer.


FAQ:
1.Q: Are you a factory or trading company?
A: We are professional manufacturer, and our company also is a very professional a trade company for steel products.We can provide a wide range of steel products. 

2.Q:What do your factory do regarding quality control?
A: We have obtained ISO, CE and other certifications. From materials to products, we check every process to maintain good quality.

3.Q: Can I get samples before order ?
A: Yes, of course. Usually our samples are free. we can produce by your samples or technical drawings.

4.Q:How do you make our business long-term and good relationship?
A:We keep good quality and competitive price to ensure our customers benefit ; We respect every customer as our friend and we sincerely do business and make friends with them. No matter where they come from.

5.Q:what is your delivery time ?
A: Our delivery time is about one week, timing according to the number of customers.
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