Products Description
Product Specifications
| Standards | ASTM A213 / ASME SA213 |
| Steel Grades | TP201 TP202 TP304 TP304L TP304H TP309S TP309H TP310S TP316 TP316L TP317 TP321 TP347 TP347H TP348 TP348H TP444 |
| Equivalent Standards | EN 10216-5, DIN 17456, JIS G3463 |
| Tube Outer Diameter (OD) | 16 mm – 63.5 mm |
| Tube Wall Thickness (WT) | 1.0 mm – 4.0 mm |
| Length | Up to 20,000 mm (custom available) |
| Fin Height | 8 mm – 16 mm |
| Fin Thickness | 0.3 mm – 0.6 mm |
| Fin Pitch | 8 – 12 FPI |
The structure of the G type finned tube ensures a tight fit between the fin and the base tube, resulting in lower contact thermal resistance compared to standard L-type or LL-type wrapped finned tubes. The significantly increased heat transfer area per unit length allows for more compact designs of condensers, evaporators, and coils.
Compared to finned tubes made of materials like copper or aluminum, stainless steel offers superior corrosion resistance; for instance, TP316L exhibits excellent resistance to pitting and crevice corrosion when exposed to conditions common in HVAC systems, such as condensate, acidic condensate from dehumidification, coastal salt spray, and environments with low chloride levels.
Customized Services
- TORICH offers custom sizing services; specifications such as base tube outer diameter, wall thickness, length, fin height, fin thickness, and fin pitch (FPI) can be tailored to drawings or design parameters.
- In addition to standard grades like TP304/304L/316/316L/321/310S, materials such as 904L, S32205 duplex stainless steel, or other special alloys can be selected based on the corrosiveness of the medium; the fin material may also differ from that of the base tube.
- We provide various end treatments and configurations, including plain ends, beveled ends, threading, flaring, swaging, flanged connections, welded elbows, U-bends, coiled tubing, and complex shapes per customer requirements.
- Surface treatment options include pickling and passivation, bright annealing, mechanical polishing, and electropolishing.
Chemical Composition
| Element | C | Mn | Si | P | S | Cr | Ni | N |
|---|---|---|---|---|---|---|---|---|
| TP201 | ≤0.15 | 5.5–7.5 | ≤1.00 | ≤0.060 | ≤0.030 | 16.0–18.0 | 3.5–5.5 | ≤0.25 |
| TP202 | ≤0.15 | 7.5–10.0 | ≤1.00 | ≤0.060 | ≤0.030 | 17.0–19.0 | 4.0–6.0 | ≤0.25 |
| TP304 | ≤0.08 | ≤2.00 | ≤1.00 | ≤0.045 | ≤0.030 | 18.0–20.0 | 8.0–11.0 | - |
| TP304L | ≤0.035 | ≤2.00 | ≤1.00 | ≤0.045 | ≤0.030 | 18.0–20.0 | 8.0–12.0 | - |
Mechanical Properties
| Property | Tensile Strength (MPa) | Yield Strength 0.2% (MPa) | Elongation (%) | Hardness (HB) |
| TP201 | ≥520 | ≥275 | ≥40 | ≤201 |
| TP202 | ≥515 | ≥275 | ≥40 | ≤201 |
| TP304 | ≥515 | ≥205 | ≥40 | ≤201 |
| TP304L | ≥485 | ≥170 | ≥40 | ≤183 |
Possible Alternative Grades
- For outdoor HVAC equipment installed in coastal areas, TP316L is a suitable choice, offering superior resistance to chloride-induced pitting corrosion.
- For industrial HVAC systems operating in harsh environments, duplex 2205 stainless steel finned tubes offer greater mechanical strength and superior corrosion resistance compared to conventional austenitic stainless steels.
- For high-temperature hot water, steam coils, or heat recovery systems, TP321 is an appropriate option; its titanium stabilization prevents intergranular corrosion in the 350°C–500°C range, making it suitable for high-temperature applications.
application areas
- Commercial Air Conditioning Systems: Central air conditioning equipment, VRF/VRV systems, fan coil units
- Refrigeration and Cooling Equipment: Air-cooled chillers, evaporator assemblies, cooling modules
- Air-Cooled Condenser Units: Refrigeration condensers, HVAC condenser coils, heat recovery units
- Industrial HVAC and Process Cooling Systems: Factory cooling systems, industrial air conditioning equipment, equipment room cooling systems
Products Show
Testing Equipment
Factory Equipment
Pickling equipment
Products Package
FAQ
Q: What is a G-type finned tube? How does it differ from L, LL, and KL-type wrapped finned tubes?
A: A G-type finned tube is manufactured by machining a spiral groove into the outer surface of the base tube, embedding a stainless steel fin into the groove, and locking it in place via rolling. Compared to L, LL, and KL-type wrapped finned tubes, the G-type fin offers a tighter bond with the base tube, lower contact thermal resistance, and superior resistance to vibration and thermal shock.
Q: What are the operating temperature and pressure ranges for stainless steel G-type finned tubes?
A: Common austenitic stainless steel grades are suitable for long-term use within a temperature range of -196°C to approximately 450°C.
Q: How is the fin pitch (FPI) selected?
A: Fin pitch is primarily determined by factors such as airflow resistance, heat transfer capacity, and the risk of fouling. Typically, forced-air heat exchangers utilize 8–12 FPI; 5–8 FPI may be selected for applications involving high airflow rates or lower air cleanliness; and 4–6 FPI is suitable for environments with high dust levels to minimize dust accumulation and reduce cleaning frequency.
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