Stainless Steel 309 Fin Tubes, ss 309 Stainless Steel Fin Tube Manufacturer, SS 309 Fin Tube Supplier, SS 309Fin Tube Exporter, Stainless Steel 309Precision Tubing, SS 309Small Diameter Tube ,SS 309Fin Tubes
Stainless Steel 309 Fin Tubes are specialized heat exchanger components known for their superior high-temperature resistance and durability. These tubes are fabricated using grade 309 stainless steel, which contains higher levels of chromium and nickel compared to other stainless steels. This composition enhances oxidation resistance and makes 309 stainless steel particularly suitable for applications involving extreme heat and corrosive environments. The addition of external fins to the tubes increases the surface area, significantly improving the efficiency of heat transfer in air-to-liquid or liquid-to-liquid systems.
These finned tubes are commonly used in industries such as petrochemical, power generation, chemical processing, and marine applications, where heat exchangers must withstand high operating temperatures and aggressive media. Stainless Steel 309 can maintain its mechanical properties and structural integrity even at temperatures up to 1000°C (1832°F). This makes 309 fin tubes ideal for use in boilers, superheaters, and furnace components, where both thermal conductivity and corrosion resistance are critical.
One of the main advantages of 309 fin tubes is their resistance to oxidation and scaling in continuous service, especially in atmospheres containing sulfur or other aggressive compounds. Their design allows for increased thermal efficiency without a proportional increase in material cost, making them an economically viable option for large-scale heat exchanger systems. Additionally, their mechanical strength ensures a longer service life with reduced maintenance and replacement needs.
Manufacturing processes for these tubes include high-frequency welding, extrusion, and tension winding techniques, depending on the fin configuration (such as longitudinal, helical, or serrated fins). Customization options in terms of fin dimensions, spacing, and materials allow engineers to tailor the tubes to specific performance requirements. These options are especially valuable in bespoke industrial systems where operating conditions can vary widely.
Specification of Stainless Steel 309 Fin Tubes
| Property | Specification |
|---|---|
| Material Grade | Stainless Steel 309 / 309S |
| Standards | ASTM A213, ASTM A249, ASTM B163, ASME SA213, SA249 |
| Tube Outer Diameter (Base Tube) | 6 mm to 50.8 mm (1/4" to 2") |
| Tube Wall Thickness | 0.5 mm to 3 mm |
| Fin Type | Helical (Spiral), Longitudinal, Serrated, Embedded, Extruded |
| Fin Material | SS 309, or other grades as per requirement |
| Fin Height | 5 mm to 15 mm |
| Fin Thickness | 0.3 mm to 1.2 mm |
| Fin Density (Fins per Inch) | 4 to 12 FPI |
| Tube Length | Up to 18 meters (custom lengths available) |
| Melting Point | 1354 – 1413 °C (2470 – 2575 °F) |
| Max Operating Temp | ~1000 °C (1832 °F) |
| Tensile Strength | ≥ 75 ksi (515 MPa) |
| Yield Strength (0.2% offset) | ≥ 30 ksi (205 MPa) |
| Elongation | ≥ 40% |
| Hardness | ≤ 95 HRB |
| Corrosion Resistance | Excellent in oxidizing environments |
| Applications | Heat exchangers, boilers, furnaces, superheaters, chemical processing |
In conclusion, Stainless Steel 309 Fin Tubes offer a high-performance solution for demanding heat exchange applications. Their combination of excellent heat resistance, corrosion resistance, and mechanical strength ensures reliability and longevity. As industries continue to push for more energy-efficient and durable solutions, 309 finned tubes remain a crucial component in the design of modern thermal systems.
Chemical Composition of Stainless Steel 309 Fin Tubes
| Element | Minimum (%) | Maximum (%) | Purpose / Effect |
|---|---|---|---|
| Carbon (C) | — | 0.20 | Improves strength at high temperatures |
| Manganese (Mn) | — | 2.00 | Enhances hot working properties and strength |
| Phosphorus (P) | — | 0.045 | Kept low to maintain ductility and corrosion resistance |
| Sulfur (S) | — | 0.030 | Kept low to avoid hot cracking during welding |
| Silicon (Si) | 0.75 | 1.00 | Increases oxidation resistance |
| Chromium (Cr) | 22.0 | 24.0 | Provides excellent oxidation and corrosion resistance |
| Nickel (Ni) | 12.0 | 15.0 | Enhances corrosion resistance and high-temperature stability |
| Iron (Fe) | Balance | Balance | Base metal |
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Specification of Stainless Steel 309 Fin Tubes
| Property | Specification |
|---|---|
| Material Grade | Stainless Steel 309 / 309S |
| Standards | ASTM A213, ASTM A249, ASTM B163, ASME SA213, SA249 |
| Tube Outer Diameter (Base Tube) | 6 mm to 50.8 mm (1/4" to 2") |
| Tube Wall Thickness | 0.5 mm to 3 mm |
| Fin Type | Helical (Spiral), Longitudinal, Serrated, Embedded, Extruded |
| Fin Material | SS 309, or other grades as per requirement |
| Fin Height | 5 mm to 15 mm |
| Fin Thickness | 0.3 mm to 1.2 mm |
| Fin Density (Fins per Inch) | 4 to 12 FPI |
| Tube Length | Up to 18 meters (custom lengths available) |
| Melting Point | 1354 – 1413 °C (2470 – 2575 °F) |
| Max Operating Temp | ~1000 °C (1832 °F) |
| Tensile Strength | ≥ 75 ksi (515 MPa) |
| Yield Strength (0.2% offset) | ≥ 30 ksi (205 MPa) |
| Elongation | ≥ 40% |
| Hardness | ≤ 95 HRB |
| Corrosion Resistance | Excellent in oxidizing environments |
| Applications | Heat exchangers, boilers, furnaces, superheaters, chemical processing |
🏭 Industry & Application
- ✅ SS 309 Fin Tubes for Medical Industry
- ✅ SS 309 Fin Tubes for Chemical Processing
- ✅ SS 309 Tubes for Fin Lines
- ✅ Stainless Steel 309 Fin Tubes for Gas & Liquid Flow
- ✅ SS 309 Tubes for Heat Exchangers
❓ Frequently Asked Questions (FAQs)
Q1:What are Stainless Steel 309 Fin Tubes used for?
Stainless Steel 309 fin tubes are primarily used in high-temperature heat exchanger applications, such as in boilers, furnaces, superheaters, chemical plants, and power generation systems. They are ideal for environments where both heat resistance and corrosion resistance are critical.
Q2:What makes SS 309 suitable for high-temperature applications?
SS 309 contains high levels of chromium (22–24%) and nickel (12–15%), which give it excellent oxidation resistance up to 1000°C (1832°F). It also maintains its strength and structural integrity at elevated temperatures, making it suitable for continuous high-temperature service.
Q3:Can SS 309 fin tubes resist corrosion in sulfur-rich environments?
Yes, 309 stainless steel exhibits good resistance to sulfur-containing atmospheres, making it suitable for applications like waste incineration or petrochemical furnaces, provided moisture is not present at low temperatures (to avoid sulfide stress corrosion).
Stainless Steel 309 Fin Tubes exporter
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