Products Description
Product Specifications
| Standards | ASTM A213, ASTM A269, ASTM A312, EN 10216-5 |
| Steel Grades | TP304, TP304L, TP316, TP316L, Duplex 2205 |
| Equivalent Standards | EN (1.4301, 1.4404, 1.4462), DIN (X5CrNi18-10) |
| Tube Outer Diameter | 19 mm – 76 mm |
| Wall Thickness (WT) | 2.0 mm – 8.0 mm |
| Tube Length | Up to 18 meters |
| Fin Height | 8 mm – 20 mm |
| Fin Thickness | 0.8 mm – 1.5 mm |
| Fin Pitch | 4 – 11 FPI |
Serrated Finned Tube is capable of operating stably over extended periods at working temperatures reaching up to 600°C; specifically, 304 stainless steel can be utilized continuously at temperatures below 540°C, while 316L offers even superior high-temperature stability.
The serrated fin design significantly expands the heat exchange surface area (increasing the heat dissipation area to more than eight times that of a bare tube) and generates intense turbulence as airflow passes through. This results in a 30% to 50% improvement in heat transfer efficiency compared to standard straight-finned tubes. Furthermore, the high-frequency welding process ensures a metallurgical bond between the fins and the base tube, yielding a tensile strength exceeding 200 MPa.
The smooth surface of the stainless steel-combined with the serrated structure, which alters fluid flow direction-minimizes the accumulation of dust and particulate matter. Consequently, its fouling resistance is improved by over 40% compared to carbon steel finned tubes, making it ideally suited for heat exchange applications involving dust-laden flue gas within the power generation industry.
Customized Services
- TORICH offers customized sizing services for base tube outer diameters (19 mm – 76 mm), wall thicknesses (2.0 mm – 8.0 mm), fin heights (8 mm – 20 mm), fin thicknesses (0.8 mm – 3.5 mm), and fin pitches (3 mm – 75 mm).
- We support the customization of specialized configurations-such as U-shaped, L-shaped, and serpentine structures-to accommodate the confined installation spaces often found in power generation equipment; fin arrangement patterns (inline or staggered) can also be customized.
- We provide various end-finishing services, including chamfering, grooving, and threading.
Chemical Composition
| Element | C (%) | Mn (%) | Si (%) | P (%) | S (%) | Cr (%) | Ni (%) | Mo (%) |
|---|---|---|---|---|---|---|---|---|
| 304 | ≤0.08 | ≤2.00 | ≤1.00 | ≤0.045 | ≤0.030 | 18.0–20.0 | 8.0–10.5 | - |
| 316 | ≤0.08 | ≤2.00 | ≤1.00 | ≤0.045 | ≤0.030 | 16.0–18.0 | 10.0–14.0 | 2.0–3.0 |
| 321 | ≤0.08 | ≤2.00 | ≤1.00 | ≤0.045 | ≤0.030 | 17.0–19.0 | 9.0–12.0 | - |
| 409 | ≤0.08 | ≤1.00 | ≤1.00 | ≤0.045 | ≤0.030 | 10.5–11.75 | ≤0.50 | - |
Mechanical Properties
| Property | Tensile Strength (MPa) | Yield Strength 0.2% (MPa) | Elongation (%) | Hardness (HB) |
| 304 | ≥520 | ≥205 | ≥40 | ≤90 |
| 316 | ≥515 | ≥205 | ≥40 | ≤90 |
| 321 | ≥515 | ≥205 | ≥40 | ≤90 |
| 409 | ≥380 | ≥170 | ≥20 | ≤88 |
Possible Alternative Grades
- For extremely high-temperature operating conditions, TP310S is a suitable choice; it can operate continuously at temperatures below 850°C and applies to ultra-supercritical power generation units, high-temperature flue gas heat exchangers, and similar equipment.
- In the power generation industry-specifically within demanding environments such as Flue Gas Desulfurization (FGD) systems and high-temperature flue gas heat exchange involving chlorine-2205 duplex stainless steel is recommended, as its corrosion resistance surpasses that of 316L.
application areas
- In thermal power plant boiler systems, they are primarily utilized in economizers, air preheaters, flue gas waste heat recovery units, and similar components.
- In hydroelectric power generation, they are employed in air coolers for hydro-turbine generators, lubrication oil coolers for generating units, cooling water heat exchange systems, and related applications.
- In combined-cycle power plants, they are used within Heat Recovery Steam Generators (HRSGs).
- In nuclear power plants, they are applied in feedwater heaters, heat exchangers for auxiliary cooling systems, and other critical equipment.
- Serrated Finned Tube is also utilized for waste heat recovery in waste-to-energy incineration plants, Flue Gas Desulfurization (FGD) systems, and waste heat recovery applications in industrial furnaces and kilns.
Products Show
Testing Equipment
Factory Equipment
Pickling equipment
Products Package
FAQ
Q: What is the maximum operating temperature?
A: It can reach up to 600°C, depending on the material grade.
Q: How do I select the appropriate material (304 vs. 316L)?
A: If the operating environment involves standard flue gas, air, or freshwater media, and the temperature is ≤ 540°C, TP304/304L is a suitable choice. However, if the operating environment contains chloride ions (e.g., in coastal power plants or seawater cooling systems), sulfur-bearing flue gas, or involves highly corrosive chemical environments, TP316/316L is recommended.
Q: What inspections are performed?
A: PMI, UT, eddy current testing, and hydrostatic testing.
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