High Frequency Welded Finned Tubes – TP304H Base Tube + SS304 Fins

Product Overview – High Frequency Welded Finned Tubes (TP304H Base + SS304 Fins)

High Frequency Welded Finned Tubes with A312 TP304H base tube and SS304 fins are premium stainless steel finned tubes designed for high-temperature and corrosive environments. The combination of TP304H base tube (high-temperature austenitic stainless steel) and SS304 fins provides excellent heat transfer efficiency, superior oxidation resistance, and long service life in demanding industrial applications.

These tubes are manufactured using the high-frequency resistance welding process, ensuring a strong metallurgical bond between the fins and the base tube without the use of filler material.

Structure of TP304H / SS304 High Frequency Welded Finned Tubes

The finned tube consists of three main components:

• Base Tube: ASTM A312 TP304H seamless stainless steel tube, serving as the fluid carrier and providing high-temperature strength.
• Fins: SS304 (UNS S30400) stainless steel strip fins helically wound around the base tube.
• Welding Process: High-frequency resistance welding creates a continuous, high-integrity bond between the fin root and the base tube outer surface. This solid-state welding method ensures minimal heat-affected zone and excellent mechanical strength.

Chemical Composition

Base Tube – ASTM A312 TP304H

Fins – SS304 Stainless Steel

Dimensional Tolerances (Typical Range)

Performance Advantages of TP304H + SS304 HF Welded Finned Tubes

• Excellent high-temperature strength and creep resistance (TP304H)
• Superior oxidation and corrosion resistance in both base tube and fins
• High heat transfer efficiency due to continuous helical fin design
• Strong and reliable weld bond (no filler metal)
• Long service life with minimal maintenance
• Suitable for operating temperatures up to 800°C
• Good resistance to thermal fatigue and vibration

Detailed Application Fields

TP304H + SS304 High Frequency Welded Finned Tubes are widely used in the following industries:

• Petrochemical and oil refining (fired heaters, convection sections)
• Power generation boilers and waste heat recovery systems
• Heat recovery steam generators (HRSG)
• Chemical processing plants
• Metallurgical furnaces and annealing lines
• Food processing and pharmaceutical equipment requiring high cleanliness
• Offshore and marine heat exchangers

Our Advantages and Manufacturing Experience

With over 15 years of experience in manufacturing high-frequency welded finned tubes, we specialize in stainless steel finned tube solutions for high-temperature applications. Our TP304H base tubes are sourced from premium mills and strictly comply with ASTM A312 standards. We maintain full traceability and provide material certificates (EN 10204 3.1 / 3.2) upon request.

Key strengths include:

• Strict quality control on weld integrity and fin geometry
• Customized fin specifications according to customer drawings
• Competitive lead time and stable supply capacity
• Technical support for material selection and fin design optimization