The general materials of base tubes about the extruded finned tube are carbon steel, copper, alloy, stainless steel ; the general materials of fins about the extruded finned tube are copper, aluminum 1060/1070, aluminum alloy 6063/6061.Therefore, it is generally divided into four categories: steel aluminum composite finned tubes; copper aluminum composite finned tubes; pure aluminum composite finned tubes, pure copper composite finned tube.

Extruded finned tubes application:

1.Operating temperatures less than 300°C;

2.Offshore or other remote applications;

3.Dry air coolers for air, gas or oil;

4. Air to air heat exchangers for HVAC applications;

5. Air dehumidification in air treatment plants;

6. Eenergy recovery in air exhaust system, etc

This page let's talk about ASME SA249 stainless steel extruded finned tubes with AL1060 fins.

Detailes of ASME SA249 Welded Base Tubes ( Generally with min. wall thickness )

SA249 This speciﬁcation covers nominal-wall-thickness welded tubes and heavily cold worked welded tubes, with various grades intended for such use as boiler, superheater, heat exchanger, or condenser tubes.

Chemical Composition (%) max

Grade	C	Mn	P	S	Si	Cr	Ni
TP304	0.08	2.00	0.045	0.030	1.00	18.0-20.0	8.0-11.0

Mechanical Properties

Grade	Tensile Strength min	Yield Strength min	Elongation in 2" or 50mm min
TP304	75ksi (515 MPa)	30ksi (205 MPa)	35%

Advantages of Steel Aluminum Composite Extruded Finned Tubes

The processing technology of steel and aluminum cold-rolled fin tube consists of aluminum tube and steel pipe being processed into bimetal composite tube, and then forming fin after mechanical cold rolling.

Based on the physical characteristics of aluminum tube, the tube with steel tube as the core and the cold rolled aluminum fin are made into a finned tube. Widely used in steel, petroleum, chemical industry, machinery, shipbuilding, power stations and hospitals and food industries.

Composite finned tubes have the following characteristics:

1. High heat transfer performance, small contact thermal resistance;

2. The contact area between the fin and the pipe is large, the fit is tight and reliable;

3. Good corrosion resistance, stable long-term use performance;

4. The fin has good rigidity and is not easy to deform.

Specifications For Various Types Of Finned Tubes

Type	Description	Base tube	Fin specification (mm)
Type	Description	O.D. (mm)	Fin pitch	Fin height	Fin thick
Embedded	G-type fin tube	16-63	2.1~5	<17	~0.4
Extruded	Single metal / Combined metal	8-51	1.6~10	<17	0.2-0.4
	Low fin tube / T-type fin tube	10-38	0.6~2	<1.6	~0.3
	Bamboo tube / corrugated tube	16-51	8.0~30	<2.5	~0.3
Wound	L / KL / LL fin type	16-63	2.1~5	<17	~0.4
String	String fin tube	25-38	2.1-3.5	<20	0.2-0.5
U-type	U-type fin tube	16-38	/	/	/
Welding	HF-welding fin tube	16-219	3~25	5~30	0.8-3
	H / HH type fin tube	25-63	8~30	<200	1.5-3.5
	Studed fin tube	25-219	8~30	5~35	φ5-20

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