Products Description
Product Specifications
| Base Tube Standards | ASTM A213 / ASME SA213 |
| Steel Grades | TP201 TP202 TP304 TP304L TP304H TP309S TP309H TP310S TP316 TP316L TP317 TP321 TP347 TP347H TP348 TP348H TP444,etc. |
| Equivalent Standards | EN 10216-5, JIS G3463, DIN 17458 |
| Tube Outer Diameter | 15.88–50.8 mm (5/8"–2") |
| Tube Wall Thickness | 1.0–3.0 mm |
| Tube Length | Up to 18,000 mm, customized |
| Fin Height | 6.35–25.4 mm |
| Fin Thickness | 0.30–0.50 mm |
| Fin Pitch | 2.1–6.0 mm |
L fin tube is manufactured using a precision rolling process that ensures a zero-gap fit between the fin and the base tube. Delivering heat transfer efficiency two to three times higher than standard carbon steel finned tubes, they enable rapid heating or cooling of industrial media and significantly reduce operational energy consumption.
The L-shaped wrapped fin structure ensures a secure, permanent bond. With a smooth, flat surface that resists the accumulation of dust and dirt, these tubes offer superior resistance to fouling and clogging compared to helically wound finned tubes; this effectively reduces the frequency of equipment shutdowns for cleaning and lowers long-term maintenance costs.
Customized Services
- TORICH offers custom sizing services, supporting non-standard specifications for the base tube's outer diameter, wall thickness, and length; fin height, thickness, and spacing can also be adjusted to meet specific requirements regarding heat transfer capacity, air velocity, and medium flow rates.
- Custom processing-such as plain end cutting, chamfering, flaring, swaging, threading, and flange welding-is available to suit equipment installation needs.
- In addition to standard austenitic stainless steel, we offer combinations of fins and base tubes made from duplex stainless steel (S31803/S32205), super austenitic stainless steel (904L/S31254), and nickel-based alloys (Inconel 625/825) to withstand harsh operating conditions, such as high chloride ion concentrations, strong acids, or seawater cooling.
- Pre-bent U-tubes are available to meet specific heat exchanger tube bundle layout requirements.
Chemical Composition
| Element | C, max. | Si, max. | Mn, max. | P, max. | S, max. | Cr | Ni | Mo | Other |
|---|---|---|---|---|---|---|---|---|---|
| TP304 | 0.08 | 1.00 | 2.00 | 0.045 | 0.030 | 18.0–20.0 | 8.0–11.0 | - | - |
| TP316 | 0.08 | 1.00 | 2.00 | 0.045 | 0.030 | 16.0–18.0 | 10.0–14.0 | 2.0–3.0 | - |
| TP310S | 0.08 | 1.00 | 2.00 | 0.045 | 0.030 | 24.0–26.0 | 19.0–22.0 | - | - |
Mechanical Properties
| Property | Tensile Strength, min. | Yield Strength, min. | Elongation in 50 mm, min. | Hardness, max. |
|---|---|---|---|---|
| TP304 | 515 MPa | 205 MPa | 35% | 192 HBW / 90 HRB |
| TP316 | 515 MPa | 205 MPa | 35% | 192 HBW / 90 HRB |
| TP310S | 515 MPa | 205 MPa | 35% | 192 HBW / 90 HRB |
Possible Alternative Grades
- Compared to 316L, 2205 duplex stainless steel offers higher strength and superior resistance to chloride-induced pitting and stress corrosion; it is suitable for environments involving high salinity, high chloride levels, seawater heat exchange, and highly corrosive chemical processes.
- TP321/TP321H is a suitable choice for operating conditions in the 500–700°C range, such as steam heaters, thermal oil heaters, and high-temperature flue gas waste heat recovery systems.
- Grade 20# carbon steel is suitable for applications involving ambient temperatures, non-corrosive environments, and clean, dry conditions-such as industrial ventilation and standard water-based heating or cooling circuits.
application areas
ASTM A213 Stainless Steel L Fin Tube is commonly used in:
- Industrial process air coolers
- Hydraulic oil coolers
- Lubricating oil coolers
- Compressor aftercoolers
- Industrial air heaters
- Process heating coils
- Gas cooling systems
- Industrial dryers
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FAQ
Q: Are stainless steel finned tubes prone to dust accumulation and clogging during use?
A: L-type finned tubes feature a smooth, compact surface with no dead zones; compared to other finned tube designs, they accumulate less dust and are resistant to fouling, making routine maintenance simple. For high-dust environments, models with wider fin spacing can be customized to prevent clogging completely.
Q: Are the products tested before leaving the factory? Are test reports available?
A: All products undergo 100% hydrostatic testing, eddy current testing, dimensional inspection, and material spectral analysis. Shipments include complete material specifications, test reports, and certificates of conformity; third-party re-inspection is also supported.
Q: Which offers better heat transfer performance: L-type finned tubes, wound-fin tubes, or sleeve-fin tubes?
A: Under identical specifications, L-type rolled finned tubes offer the best heat transfer performance. Because the fins fit the base tube with zero clearance, thermal resistance is extremely low; the absence of an insulating air gap ensures stable heat transfer efficiency. In contrast, wound-fin and sleeve-fin structures have gaps that can loosen during prolonged exposure to high temperatures.
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