Products Description
Product Specifications
| Standards | ASTM A312 / ASME SA312 |
| Steel Grades | 304 304L 304H 304LN 309S 309H 310S 316 316L 316LN 317 321 347 347H 348 904L |
| Equivalent Standards | EN 10216-5 / DIN 17458 / JIS G3459 |
| Tube Outer Diameter (OD) | 12-165mm, customizable |
| Tube Wall Thickness (WT) | 1–20 mm, customizable |
| Tube Length | Up to 18m, customizable |
| Fin Height | 6–50 mm, customizable |
| Fin Thickness | 0.3-5.0 mm, customizable |
| Fin Pitch | 4-13 FPI, customizable |
The ASTM A312 stainless steel base material contains 18%–20% chromium and 8%–13% nickel (with TP316L containing an additional 2%–3% molybdenum). A dense chromium oxide passivation film forms on its surface, effectively resisting corrosion from sulfides (H₂S), chloride ions (Cl⁻), and acidic media present in oil and gas environments, thereby meeting the corrosion resistance standards of the oil and gas industry.
The Stainless Wrapped Finned Tube utilizes a cold-wrapping and high-frequency welding process, ensuring a tight mechanical interlock between the fins and the base tube with a contact gap of ≤0.05 mm. Validated through vibration testing, the fins demonstrate no displacement or detachment even under complex operating conditions.
Customized Services
- TORICH offers customization services tailored to client requirements, including the production of tubes in various materials-such as 304, 316, 321, 310, and 2205-as well as custom sizing.
- In addition to standard pickled finishes, we provide a range of surface treatments, including bright annealing, sandblasting, and electropolishing.
- We also offer finning services for "U-bend tubes"; specifically for flue gas environments characterized by high dust levels and a propensity for fouling, we support the customization of extra-wide fin spacing (e.g., 4–6 mm) to prevent clogging.
Chemical Composition
| Element | C | Mn | Si | P (max) | S (max) | Cr | Ni | Mo |
|---|---|---|---|---|---|---|---|---|
| 304L | ≤0.030 | ≤2.00 | ≤1.00 | ≤0.045 | ≤0.030 | 18.0–20.0 | 8.0–12.0 | - |
| 309S | ≤0.080 | ≤2.00 | ≤1.00 | ≤0.045 | ≤0.030 | 22.0–24.0 | 12.0–15.0 | - |
| 316L | ≤0.030 | ≤2.00 | ≤1.00 | ≤0.045 | ≤0.030 | 16.0–18.0 | 10.0–14.0 | 2.0–3.0 |
Mechanical Properties
| Property | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) | Hardness (HB) |
| 304L | ≥485 | ≥170 | ≥35 | ≤192 |
| 309S | ≥515 | ≥205 | ≥40 | ≤192 |
| 316L | ≥485 | ≥170 | ≥40 | ≤192 |
Possible Alternative Grades
- Incoloy 800 / 800H exhibits excellent high-temperature creep strength and rupture strength, making it suitable for heat exchangers operating at temperatures above 600–800°C.
- Inconel 600 / 625 possesses superior corrosion resistance and oxidation resistance, making it suitable for high-temperature flue gas heat exchangers.
- 904L demonstrates exceptional resistance to pitting, crevice corrosion, and chloride corrosion, making it suitable for seawater desalination plants.
application areas
The specific applications of ASTM A312 stainless wrapped finned tube in the oil and gas industry are as follows:
- Air coolers in oil refineries
- Heat exchangers for offshore oil platforms and FPSO systems
- Glycol regeneration units and gas dehydration systems
- Liquefied Natural Gas (LNG) vaporization systems
- Sulfur recovery units
- Fired heaters and petrochemical furnaces in refineries
- Marine HVAC heat exchange systems
Products Show
Testing Equipment
Factory Equipment
Pickling equipment
Products Package
FAQ
Q: What is a spiral-wound finned tube, and how does it enhance heat transfer efficiency?
A: Spiral-wound finned tubes increase the contact surface area of a heat exchanger by tightly winding a continuous spiral metal strip (fin) around the outer surface of a base tube. In oil and gas applications, this configuration promotes intense turbulence in the external fluid flowing through the shell side, thereby significantly reducing thermal resistance.
Q: Can specialized alloys be used for both the base tube and the fins?
A: Yes, duplex stainless steel, super duplex stainless steel, Inconel, and 254 SMO are all available options.
Q: Can you produce bent finned tubes for use in U-tube bundle heat exchangers?
A: Yes, we can manufacture U-bent finned tube assemblies. We can accommodate initial straight tube lengths of up to 27,000 mm while maintaining optimal fin density. By carefully controlling the bending radius and applying post-bending heat treatment, we ensure that the bends remain free of wrinkling and excessive wall thinning.
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