Stainless Steel 304 / 304L Fin Tubes, 304 / 304L Stainless Steel Fin Tube Manufacturer, SS 304 / 304L Fin Tube Supplier, SS 304 / 304L Fin Tube Exporter, Stainless Steel 304 / 304L Precision Tubing, SS 304 / 304L Small Diameter Tube ,SS 304 / 304L Fin Tubes
Stainless Steel 304 / 304L Fin Tubes are widely used in heat exchanger applications due to their excellent corrosion resistance, durability, and efficient heat transfer properties. These finned tubes are manufactured by attaching external fins to the surface of stainless steel tubing, increasing the surface area and thereby enhancing the heat transfer efficiency between fluids. The base material—SS 304 or 304L—offers a balance of strength and resistance to various chemical and atmospheric environments, making it a versatile choice across industries.
Grade 304 stainless steel is the most commonly used austenitic stainless steel, known for its good mechanical properties and corrosion resistance. It contains 18% chromium and 8% nickel, which provide a robust shield against oxidation and rust. On the other hand, 304L is a low-carbon version of 304, which reduces the risk of carbide precipitation during welding and improves weldability without compromising corrosion resistance. This makes 304L particularly suitable for applications involving extensive welding or exposure to corrosive environments.
Fin tubes made from 304/304L are ideal for applications where high thermal conductivity and structural strength are required. These include petrochemical plants, power generation, HVAC systems, food processing, and marine applications. The enhanced surface area provided by the fins significantly improves the tube's ability to dissipate heat, which is critical in systems where efficient heat exchange is essential to performance and energy conservation.
Another key advantage of using 304/304L stainless steel fin tubes is their long service life and low maintenance requirements. The material resists scaling and maintains structural integrity even at elevated temperatures. Additionally, the tubes are compatible with a wide range of working fluids, including water, steam, air, oil, and various chemical solutions, adding to their utility across multiple sectors.
Specification of Stainless Steel 304 / 304L Fin Tubes
| Parameter | Specification |
|---|---|
| Base Material | Stainless Steel 304 / 304L |
| Standards | ASTM A213 / A269 / A249, ASME SA213 / SA249 |
| Outer Diameter (OD) | 15.88 mm to 50.8 mm (5/8" to 2") |
| Wall Thickness | 0.7 mm to 3.0 mm |
| Fin Type | L-Foot, G-Foot (Embedded), Extruded, Welded, Tension-Wound |
| Fin Material | Same as base tube (SS 304 / 304L), or other alloys (optional) |
| Fin Height | 6 mm to 20 mm |
| Fin Thickness | 0.3 mm to 0.6 mm |
| Fins Per Inch (FPI) | 5 to 11 FPI |
| Fin Pitch | 2.3 mm to 5.0 mm |
| Tube Length | Up to 20 meters (custom lengths available) |
| Maximum Operating Temp. | Up to 870°C (1600°F) – intermittent Up to 925°C (1700°F) – continuous |
| Corrosion Resistance | Excellent resistance to atmospheric, oxidizing, and mild chemical environments |
| Tensile Strength (min) | 515 MPa (304) / 485 MPa (304L) |
| Yield Strength (min) | 205 MPa |
| Elongation | ≥ 35% |
| Density | 8.0 g/cm³ |
| Thermal Conductivity | ~16.2 W/m·K at 100°C |
| Manufacturing Methods | Helical Finning (Welding or Wrapping), Extrusion, or Grooving |
| Applications | Heat exchangers, air coolers, boilers, economizers, condensers, oil & gas, HVAC |
In summary, Stainless Steel 304/304L Fin Tubes provide a reliable and cost-effective solution for efficient thermal exchange in demanding environments. Their combination of corrosion resistance, weldability, and thermal performance makes them a preferred choice for engineers and designers aiming for durability and operational efficiency in heat exchanger systems.
Chemical Composition of Stainless Steel 304 / 304L Fin Tubes
| Element | SS 304 (%) | SS 304L (%) | Function / Notes |
|---|---|---|---|
| Carbon (C) | ≤ 0.08 | ≤ 0.03 | Lower carbon improves weldability and reduces carbide precipitation |
| Manganese (Mn) | ≤ 2.00 | ≤ 2.00 | Improves strength and hot workability |
| Phosphorus (P) | ≤ 0.045 | ≤ 0.045 | Kept low to avoid embrittlement |
| Sulfur (S) | ≤ 0.030 | ≤ 0.030 | Impacts machinability; too much can reduce ductility |
| Silicon (Si) | ≤ 1.00 | ≤ 1.00 | Improves oxidation resistance |
| Chromium (Cr) | 18.0 – 20.0 | 18.0 – 20.0 | Provides corrosion and oxidation resistance |
| Nickel (Ni) | 8.0 – 10.5 | 8.0 – 12.0 | Enhances corrosion resistance and toughness |
| Nitrogen (N) | ≤ 0.10 | ≤ 0.10 | Increases strength (especially in low-carbon steels) |
| Iron (Fe) | Balance | Balance | Base metal |
Sumer Metal Industries Private Limited, based in Mumbai, India, is a well-established manufacturer, supplier, and global exporter of stainless steel products, including SS 304/304L Fin tubes. With state-of-the-art manufacturing facilities and adherence to international standards such as ASTM A213, A269, and A632, the company ensures that each product meets the exact dimensional, chemical, and mechanical requirements. Sumer Metal provides options for seamless, cold-drawn, and bright-annealed finishes, delivering tubes with outer diameters as small as 0.3 mm and wall thicknesses down to 0.08 mm.
Specification of Stainless Steel 304 / 304L Fin Tubes
| Parameter | Specification |
|---|---|
| Base Material | Stainless Steel 304 / 304L |
| Standards | ASTM A213 / A269 / A249, ASME SA213 / SA249 |
| Outer Diameter (OD) | 15.88 mm to 50.8 mm (5/8" to 2") |
| Wall Thickness | 0.7 mm to 3.0 mm |
| Fin Type | L-Foot, G-Foot (Embedded), Extruded, Welded, Tension-Wound |
| Fin Material | Same as base tube (SS 304 / 304L), or other alloys (optional) |
| Fin Height | 6 mm to 20 mm |
| Fin Thickness | 0.3 mm to 0.6 mm |
| Fins Per Inch (FPI) | 5 to 11 FPI |
| Fin Pitch | 2.3 mm to 5.0 mm |
| Tube Length | Up to 20 meters (custom lengths available) |
| Maximum Operating Temp. | Up to 870°C (1600°F) – intermittent Up to 925°C (1700°F) – continuous |
| Corrosion Resistance | Excellent resistance to atmospheric, oxidizing, and mild chemical environments |
| Tensile Strength (min) | 515 MPa (304) / 485 MPa (304L) |
| Yield Strength (min) | 205 MPa |
| Elongation | ≥ 35% |
| Density | 8.0 g/cm³ |
| Thermal Conductivity | ~16.2 W/m·K at 100°C |
| Manufacturing Methods | Helical Finning (Welding or Wrapping), Extrusion, or Grooving |
| Applications | Heat exchangers, air coolers, boilers, economizers, condensers, oil & gas, HVAC |
🏭 Industry & Application
- ✅ SS 304 / 304L Fin Tubes for Medical Industry
- ✅ SS 304 / 304L Fin Tubes for Chemical Processing
- ✅ SS 304 / 304L Tubes for Fin Lines
- ✅ Stainless Steel 304 / 304L Fin Tubes for Gas & Liquid Flow
- ✅ SS 304 / 304L Tubes for Heat Exchangers
❓ Frequently Asked Questions (FAQs)
Q1:What is the difference between 304 and 304L stainless steel in fin tubes?
The primary difference is the carbon content. 304L has a lower carbon content (maximum 0.03%) compared to 304 (maximum 0.08%). This makes 304L more resistant to intergranular corrosion after welding, making it better suited for applications involving high temperatures or welding. Both offer similar corrosion resistance and mechanical properties.
Q2: Are 304/304L fin tubes suitable for high-temperature applications?
Yes, 304 and 304L stainless steel perform well at elevated temperatures, typically up to around 870°C (1600°F). However, for extremely high-temperature environments where scaling and creep resistance are critical, other grades (like 316 or 321) might be preferred depending on the application.
Q3: Why choose 304L over 304 for fin tubes?
304L is preferred when welding is involved or where corrosion resistance after welding is critical, such as in pressure vessels and heat exchangers.
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At Sumer Metal Industries Pvt. Ltd., we follow a zero-defect policy by implementing stringent quality checks, using certified raw materials, and continuously improving our processes to deliver reliable and consistent tubing solutions
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