Stainless Steel Extruded Fin Tubes TP304 With AL1060 Fins For
Condenser
Extruded Finned Tubes
Extruded finned tubes are bimetallic tubes whose outer aluminium
surface is finned by cold plastic deformation.
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) |
| 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 |
