Stainless Steel 347 / 347h Fin Tubes, 347/347h Stainless Steel Fin Tube Manufacturer, SS 347/347h Fin Tube Supplier, SS 347/347h Fin Tube Exporter, Stainless Steel 347/347h Precision Tubing, SS 347/347h Small Diameter Tube ,SS 347/347h Fin Tubes
Stainless Steel 347 and 347H Fin Tubes are specialized heat transfer components designed for use in high-temperature and corrosive environments. These tubes are manufactured by integrating extended surface fins onto seamless or welded stainless steel tubing, which significantly enhances their heat transfer efficiency. The base material, SS 347/347H, is a stabilized austenitic stainless steel alloy containing chromium and nickel, along with columbium (niobium) for improved resistance to intergranular corrosion.
SS 347 is widely recognized for its excellent corrosion resistance, especially after welding or prolonged exposure to elevated temperatures. It offers superior performance in environments where standard austenitic stainless steels may fail due to carbide precipitation. SS 347H, on the other hand, is the high-carbon version of 347, providing enhanced creep strength and better performance at elevated temperatures (above 537°C or 1000°F), making it suitable for heat exchangers, boilers, and furnace parts.
These fin tubes are available in various types, including extruded, L-foot, G-foot, and embedded fins, depending on the application’s heat transfer and mechanical requirements. The finning process increases the tube’s external surface area, which helps improve heat dissipation while maintaining a compact design. This makes SS 347/347H fin tubes ideal for space-constrained systems where performance and durability are critical.
Common applications include oil and gas refineries, chemical processing units, thermal power plants, marine equipment, and petrochemical heat exchangers. Their ability to withstand aggressive media and high thermal cycling makes them a reliable choice in both horizontal and vertical heat exchange systems. Additionally, they are commonly used in air preheaters, superheaters, economizers, and gas coolers.
Specification of Stainless Steel 347 / 347h Fin Tubes
| Specification | Details |
|---|---|
| Material Grade | Stainless Steel 347 / 347H |
| Standards | ASTM A213, ASTM A269, ASTM A312, ASTM A249 |
| Tube Outer Diameter (OD) | 12.7 mm to 50.8 mm (1/2” to 2”) |
| Tube Wall Thickness | 0.5 mm to 3.0 mm (custom available) |
| Tube Length | Up to 24 meters (custom lengths available) |
| Fin Types | L-Foot, G-Foot, Extruded, Embedded, Tension-Wound |
| Fin Height | 5 mm to 20 mm |
| Fin Thickness | 0.3 mm to 1.2 mm |
| Fin Density (Pitch) | 5 to 11 FPI (Fins Per Inch) |
| Fin Material | Same as tube (SS 347 / 347H) or optional dissimilar metals (on request) |
| Temperature Range | Up to 900°C (1650°F) |
| Corrosion Resistance | Excellent (resistant to intergranular corrosion, oxidation, and scaling) |
| Creep Strength | High (especially in 347H variant for elevated temperatures) |
| Applications | Heat exchangers, boilers, air preheaters, refineries, chemical plants, etc. |
Chemical Composition of Stainless Steel 347 / 347h Fin Tubes
| Element | SS 347 (%) | SS 347H (%) | Description |
|---|---|---|---|
| Carbon (C) | ≤ 0.08 | 0.04 – 0.10 | Higher C in 347H improves high-temperature strength |
| Manganese (Mn) | ≤ 2.00 | ≤ 2.00 | Improves hot working and weldability |
| Phosphorus (P) | ≤ 0.045 | ≤ 0.045 | Typically kept low to reduce brittleness |
| Sulfur (S) | ≤ 0.030 | ≤ 0.030 | Controlled to minimize hot cracking |
| Silicon (Si) | ≤ 1.00 | ≤ 1.00 | Enhances oxidation resistance |
| Chromium (Cr) | 17.0 – 20.0 | 17.0 – 20.0 | Provides corrosion and oxidation resistance |
| Nickel (Ni) | 9.0 – 13.0 | 9.0 – 13.0 | Enhances toughness and resistance to corrosion |
| Niobium (Cb + Ta) | ≥ 10x C (min) | ≥ 10x C (min) | Stabilizes against intergranular corrosion |
| Iron (Fe) | Balance | Balance | Base metal |
Stainless Steel 347/347H Fin Tubes comply with international standards such as ASTM A213, A269, and A312, and can be customized in terms of tube diameter, fin height, fin pitch, and tube length. Their excellent mechanical properties, combined with superior corrosion and heat resistance, offer longer service life, reduced maintenance, and improved energy efficiency, making them a valuable component in industrial heat transfer applications.
Specification of Stainless Steel 347 / 347h Fin Tubes
| Specification | Details |
|---|---|
| Material Grade | Stainless Steel 347 / 347H |
| Standards | ASTM A213, ASTM A269, ASTM A312, ASTM A249 |
| Tube Outer Diameter (OD) | 12.7 mm to 50.8 mm (1/2” to 2”) |
| Tube Wall Thickness | 0.5 mm to 3.0 mm (custom available) |
| Tube Length | Up to 24 meters (custom lengths available) |
| Fin Types | L-Foot, G-Foot, Extruded, Embedded, Tension-Wound |
| Fin Height | 5 mm to 20 mm |
| Fin Thickness | 0.3 mm to 1.2 mm |
| Fin Density (Pitch) | 5 to 11 FPI (Fins Per Inch) |
| Fin Material | Same as tube (SS 347 / 347H) or optional dissimilar metals (on request) |
| Temperature Range | Up to 900°C (1650°F) |
| Corrosion Resistance | Excellent (resistant to intergranular corrosion, oxidation, and scaling) |
| Creep Strength | High (especially in 347H variant for elevated temperatures) |
| Applications | Heat exchangers, boilers, air preheaters, refineries, chemical plants, etc. |
🏭 Industry & Application
- ✅ SS 347/347h Fin Tubes for Medical Industry
- ✅ SS 347/347h Fin Tubes for Chemical Processing
- ✅ SS 347/347h Tubes for Fin Lines
- ✅ Stainless Steel 347 / 347h Fin Tubes for Gas & Liquid Flow
- ✅ SS 347/347h Tubes for Heat Exchangers
❓ Frequently Asked Questions (FAQs)
Q1: What is the difference between Stainless Steel 347 and 347H?
SS 347 and 347H are both stabilized austenitic stainless steels, but 347H has a higher carbon content (0.04–0.10%), which provides better creep strength and high-temperature performance. SS 347H is ideal for applications above 537°C (1000°F).
Q2:What are fin tubes used for?
Fin tubes are used to enhance heat transfer in equipment like heat exchangers, air preheaters, boilers, and condensers by increasing the surface area for better thermal efficiency.
Q3:Are SS 347/347H fin tubes resistant to corrosion?
Yes. These grades are highly resistant to intergranular corrosion, oxidation, and scaling, especially in high-temperature environments and after welding. The addition of niobium stabilizes the steel against carbide precipitation.
Stainless Steel 347 / 347h Fin Tubes exporter
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