ASTM A179 Carbon Steel Longitudinal Finned Tubes for Heat Exchangers
Longitudinal finned tubes are produced by resistance welding fins along the long direction of the tube. The fins first form a U-shaped channel so that each leg of the U-shape forms a fin. The channel is cut to the appropriate length, then oriented along the length of the tube and resistance welded in place. The channels are pairs of soldered, diametrically opposed, so the number of fins specified must be a multiple of four.
Carbon/alloy steel (A106, A333, A179, A335 P5, P22, P9), stainless steel (TP304, TP316L, TP321), copper alloy (CuNi 70/30, CuNi 90/10), and other materials.
Carbon steel, stainless steel, alloy steel, copper alloy, etc.
This specification covers minimum-wall-thickness, seamless cold-drawn low-carbon steel tubes for tubular heat exchangers, condensers, and similar heat transfer apparatus. Covers tubes 1⁄8 to 3 in. [3.2 to 76.2 mm] in outside diameter.
- Manufacture: Seamless process, cold drawn
- Heat treatment: At 1200°F [650°C] or higher after final cold draw pass
- Surface Condition: Free of scale (slight oxidation permitted)
- Tests: Flattening, Flaring, Flange, Hardness, Hydrostatic
| Grade | C | Mn | P | S |
|---|---|---|---|---|
| A179 | 0.06-0.18 | 0.27-0.63 | 0.035 | 0.035 |
| Grade | Tensile Strength (min) | Yield Strength (0.2% Offset, min) | Elongation (min) | Hardness (max) |
|---|---|---|---|---|
| A179 | 47ksi (325 MPa) | 26ksi (180 MPa) | 35% | 72 HRB |
- Improves heat transfer efficiency in limited space
- Reduces required installation space for heat transfer surfaces
- Enhances heat transfer while reducing flow resistance and metal consumption
- Provides high reliability in demanding applications
Ideal for power stations and high-temperature equipment in oil industry applications:
- Boilers
- Furnaces
- Economizers
- Combustion Heaters
- Large Air Coolers
- Heat Exchangers and Shell & Tube Bundles
| Type | Description | Base tube O.D. (mm) | Fin pitch (mm) | Fin height (mm) | Fin thickness (mm) |
|---|---|---|---|---|---|
| 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 type fin tube | 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 |
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