High Frequency Welded Finned Tubes: Base Tube TP321H + Fins Carbon Steel (CS)

1. Product Introduction

High Frequency Welded (HFW) Finned Tubes are engineered for maximum thermal efficiency in aggressive environments. Our tubes feature a corrosion-resistant TP321H

austenitic stainless steel base tube mechanically bonded via high-frequency welding to carbon steel (CS) fins. This design amplifies surface area by 8–12×, delivering

unmatched heat exchange performance in high-temperature/pressure applications.

2. Finned Tube Structure & Manufacturing Process

A. Base Tube (TP321H Stainless Steel):

• High-temperature stabilized austenitic stainless steel (Ti-stabilized).

• Seamless or welded construction, ideal for thermal cycling.

B. Fins (Carbon Steel - CS):

• Low-carbon steel fins (e.g., ASTM A569) for cost-effective durability.

• Helical design: 150–400 fins/meter, customizable for turbulence optimization.

C. High-Frequency Welding Process:

• Embedment Depth: 0.3–0.5 mm into the base tube.

• Bond Strength: >70 MPa (no filler material).

• Process: Electric current fuses fins to the base tube, ensuring metallurgical integrity and eliminating air gaps.

3. Dimensional Tolerances

Precision-Machined for Seamless Integration

4. Performance Advantages

• 20–35% Higher Heat Flux vs. bare tubes due to finned surface.

• 900°C Operating Temp: TP321H base resists scaling/oxidation.

• Corrosion Resistance: Ti-stabilization prevents intergranular corrosion in acidic/chloride environments (pH 2–12).

• Reduced Fouling: Helical fins disrupt boundary layers.

• Lifespan: 15+ years in boilers, exhaust systems.

5. Application Areas

• Power Generation: HRSG (Heat Recovery Steam Generators), boilers.

• Petrochemical: Crackers, reformers, sulfur recovery units (SRUs).

• Waste Heat Recovery: Exhaust stacks (400–800°C gases).

• HVAC: Industrial air heaters/dehumidifiers.

• Renewables: Biomass combustion, geothermal systems.

6. Our Expertise & Competitive Edge

15+ Years Specialization: 5,000+ tubes supplied globally (EU/APAC/MENA).

Customization: Tailored lengths (1–24m), fin density, and coatings (Aluminized/Etched).

Quality Assurance:

• Eddy current testing (ASTM E309) on base tubes.
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• Shear strength tests (70+ MPa) on fin bonds.
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• 100% dimensional inspection per ASME Sec. V.