Stainless Steel 321 / 321h Fin Tubes,321/321h Stainless Steel Fin Tube Manufacturer, SS 321/321h Fin Tube Supplier, SS 321/321h Fin Tube Exporter, Stainless Steel 321/321h Precision Tubing, SS 321/321h Small Diameter Tube ,SS 321/321h Fin Tubes
Stainless Steel 321 and 321H fin tubes are specialized heat exchanger components made from stabilized austenitic stainless steel. These tubes are enhanced with external fins to increase the surface area, significantly improving heat transfer efficiency in thermal applications. The base materials, SS 321 and SS 321H, are titanium-stabilized alloys, making them ideal for use in high-temperature environments where resistance to intergranular corrosion is critical. The finned design supports better thermal conductivity while reducing the overall weight and footprint of the system.
The primary difference between 321 and 321H lies in the carbon content—321H contains a higher percentage, making it suitable for elevated temperature services above 538°C (1000°F). This increased carbon content gives 321H enhanced creep resistance and better mechanical strength under extreme thermal conditions. Both grades maintain excellent oxidation resistance and structural integrity, making them well-suited for petrochemical, power generation, and refinery industries.
Fin tubes are produced through various finning methods, including extrusion, welding, and roll-fin techniques. These methods ensure firm bonding of fins to the tube, enabling effective and sustained performance in demanding operations. The use of stainless steel 321/321H in this form is favored not only for its thermal efficiency but also for its durability, corrosion resistance, and ease of maintenance over time.
Applications for SS 321/321H fin tubes include air coolers, economizers, boiler systems, and heat recovery systems, particularly in sectors that demand consistent high-temperature exposure. Their ability to withstand thermal cycling and aggressive media makes them a cost-effective solution for long-term operation in harsh environments.
Specification of Stainless Steel 321 / 321hFin Tubes
| Property | SS 321 | SS 321H |
|---|---|---|
| Grade | UNS S32100 | UNS S32109 |
| Standard Specifications | ASTM A213, ASTM A269, ASTM A249, ASTM B338 | ASTM A213, ASTM A269, ASTM A249, ASTM B338 |
| Tube Outer Diameter (OD) | 6.0 mm to 101.6 mm | 6.0 mm to 101.6 mm |
| Wall Thickness | 0.5 mm to 5.0 mm | 0.5 mm to 5.0 mm |
| Fin Type | Extruded / L-Foot / G-Foot / Embedded / Welded | Extruded / L-Foot / G-Foot / Embedded / Welded |
| Fin Height | Up to 15 mm (customizable) | Up to 15 mm (customizable) |
| Fin Density | 5–12 fins per inch (FPI) | 5–12 fins per inch (FPI) |
| Chemical Composition | Cr: 17–19%, Ni: 9–12%, Ti: ≥5x C, C: ≤0.08% | Cr: 17–19%, Ni: 9–12%, Ti: ≥4x C, C: 0.04–0.10% |
| Tensile Strength (min) | 515 MPa | 515 MPa |
| Yield Strength (min) | 205 MPa | 205 MPa |
| Elongation (min) | 35% | 35% |
| Maximum Operating Temp | ~870°C (1600°F) | ~870°C (1600°F); Better at >538°C (1000°F) |
| Corrosion Resistance | Excellent (especially against oxidation) | Excellent with improved high-temp resistance |
| Applications | Heat exchangers, air coolers, economizers | Boilers, superheaters, refinery equipment |
Stainless Steel 321 / 321H Fin Tubes offer a reliable and long-lasting solution in demanding conditions. Their resistance to scaling, oxidation, and intergranular attack ensures consistent performance, while their mechanical strength allows them to withstand internal pressures and mechanical stress. The combination of corrosion resistance, thermal stability, and fabrication ease makes SS 321/321H an ideal material choice for critical Fin applications requiring both safety and durability.
Chemical Composition of Stainless Steel 321 / 321hFin Tubes
| Element | SS 321 (%) | SS 321H (%) | Notes |
|---|---|---|---|
| Carbon (C) | ≤ 0.08 | 0.04 – 0.10 | 321H has higher carbon for creep resistance |
| Manganese (Mn) | ≤ 2.00 | ≤ 2.00 | Aids in strength and hot workability |
| Phosphorus (P) | ≤ 0.045 | ≤ 0.045 | Impurity – kept low |
| Sulfur (S) | ≤ 0.030 | ≤ 0.030 | Impurity – kept low |
| Silicon (Si) | ≤ 0.75 | ≤ 0.75 | Deoxidizer |
| Chromium (Cr) | 17.0 – 19.0 | 17.0 – 19.0 | Main corrosion resistance element |
| Nickel (Ni) | 9.0 – 12.0 | 9.0 – 12.0 | Austenite stabilizer |
| Titanium (Ti) | ≥ 5 × C to 0.70 max | ≥ 5 × C to 0.70 max | Stabilizes against intergranular corrosion |
| Iron (Fe) | Balance | Balance | Base element |
In summary, Stainless Steel 321 and 321H fin tubes combine the corrosion resistance and high-temperature capabilities of titanium-stabilized stainless steel with the thermal efficiency of finned surfaces. They are engineered to deliver reliable, efficient heat exchange in industrial systems, making them a top choice for industries that require longevity and performance under tough conditions.
Specification of Stainless Steel 321 / 321hFin Tubes
| Property | SS 321 | SS 321H |
|---|---|---|
| Grade | UNS S32100 | UNS S32109 |
| Standard Specifications | ASTM A213, ASTM A269, ASTM A249, ASTM B338 | ASTM A213, ASTM A269, ASTM A249, ASTM B338 |
| Tube Outer Diameter (OD) | 6.0 mm to 101.6 mm | 6.0 mm to 101.6 mm |
| Wall Thickness | 0.5 mm to 5.0 mm | 0.5 mm to 5.0 mm |
| Fin Type | Extruded / L-Foot / G-Foot / Embedded / Welded | Extruded / L-Foot / G-Foot / Embedded / Welded |
| Fin Height | Up to 15 mm (customizable) | Up to 15 mm (customizable) |
| Fin Density | 5–12 fins per inch (FPI) | 5–12 fins per inch (FPI) |
| Chemical Composition | Cr: 17–19%, Ni: 9–12%, Ti: ≥5x C, C: ≤0.08% | Cr: 17–19%, Ni: 9–12%, Ti: ≥4x C, C: 0.04–0.10% |
| Tensile Strength (min) | 515 MPa | 515 MPa |
| Yield Strength (min) | 205 MPa | 205 MPa |
| Elongation (min) | 35% | 35% |
| Maximum Operating Temp | ~870°C (1600°F) | ~870°C (1600°F); Better at >538°C (1000°F) |
| Corrosion Resistance | Excellent (especially against oxidation) | Excellent with improved high-temp resistance |
| Applications | Heat exchangers, air coolers, economizers | Boilers, superheaters, refinery equipment |
🏭 Industry & Application
- ✅ SS 321/321h Fin Tubes for Medical Industry
- ✅ SS 321/321h Fin Tubes for Chemical Processing
- ✅ SS 321/321h Tubes for Fin Lines
- ✅ Stainless Steel 321 / 321h Fin Tubes for Gas & Liquid Flow
- ✅ SS 321/321h Tubes for Heat Exchangers
❓ Frequently Asked Questions (FAQs)
Q1:What is Stainless Steel 321 / 321H?
SS 321 is a titanium-stabilized austenitic stainless steel with good resistance to intergranular corrosion.SS 321H is a high-carbon version of SS 321 designed for enhanced high-temperature strength.
Q2:What are Fin Tubes?
Fin tubes are heat exchanger tubes with external fins to increase surface area and heat transfer efficiency.321/321H fin tubes are used where corrosion resistance and heat resistance are both critical.
Q3:Can SS 321/321H fin tubes be welded?
Yes. They have good weldability using standard fusion and resistance welding methods. Post-weld annealing may be needed in some high-temperature applications.
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