ASTM A376 TP347H Carbon Steel Fin High Frequency Welded Fin Tube for Power Plant Economizer

ASTM A376 TP347H High Frequency Welded Finned Tube with Carbon Steel Fins

for High-Temperature Waste Heat Recovery in Petrochemical & Power Plant Economizers

This high frequency welded (HFW) finned tube is engineered for continuous high-temperature service in waste heat recovery units, economizers, and process gas heaters. The ASTM A376 TP347H seamless base tube delivers superior creep strength and oxidation resistance under prolonged exposure above 600°C, while the carbon steel (CS) fins provide a cost-efficient increase in external heat transfer surface area. The result is improved thermal efficiency, reduced tube metal temperature, and lower overall material cost compared with full stainless-steel finned solutions.

In petrochemical flue-gas heat recovery and power-plant economizer applications, this combination solves three common operational problems: insufficient heat recovery from high-temperature exhaust streams, accelerated oxidation and creep failure of standard carbon-steel tubes, and the high capital cost of using stainless fins throughout.

ASTM A376 TP347H Base Tube + CS Fin Structure

The tube consists of a seamless ASTM A376 TP347H austenitic stainless-steel base tube with continuously high-frequency resistance-welded solid carbon-steel fins.

The fin strip is helically wound and simultaneously welded to the outer surface of the tube by high-frequency electric resistance welding. The process creates a continuous metallurgical bond with weld integrity typically exceeding 95 %, ensuring efficient heat conduction from fin to tube wall with minimal thermal resistance. Unfinned (bare) ends are left as specified for welding or tube-sheet expansion.

Chemical Composition – ASTM A376 TP347H Base Tube

Chemical Composition – Carbon Steel Fins (Typical)

Dimensional Tolerances – ASTM A376 TP347H HFW Finned Tube

Performance Advantages in High-Temperature Service

• High creep and rupture strength of TP347H base tube at elevated temperatures
• Excellent resistance to intergranular corrosion and oxidation due to niobium stabilization
• Continuous metallurgical fin-to-tube bond ensures high heat-transfer efficiency
• Carbon-steel fins deliver large surface-area increase at significantly lower cost than stainless fins
• Thermal expansion compatibility between TP347H tube and CS fins reduces residual stress under thermal cycling
• Suitable for continuous operation in flue-gas environments up to approximately 750–800 °C (tube metal temperature)

Application Fields – ASTM A376 TP347H + CS HFW Finned Tube

• Waste-heat recovery units and economizers in petrochemical complexes
• Power-plant boiler economizers and air preheaters
• Process gas heaters and reformers in refinery and chemical plants
• Heat-recovery steam generators (HRSG) and industrial waste-heat boilers
• High-temperature flue-gas heat exchangers requiring both oxidation resistance and cost-effective surface extension

Packaging & Logistics

Finished tubes are cleaned, lightly oiled for temporary corrosion protection, and packed in wooden cases or steel-frame crates with protective end caps. Bundles are secured to prevent movement during ocean transport.

Standard export packing is suitable for container or bulk vessel shipment. Custom packing (plastic wrapping, desiccant, or export-grade wooden boxes) is available on request.

Certificates & Quality Control

• Mill Test Certificates (EN 10204 3.1) for both base tube and fin material
• Dimensional inspection report
• Visual and weld-integrity checks (pull tests performed during production)
• Optional hydrostatic or eddy-current testing of the base tube
• Traceability maintained from raw material heat numbers through finished product

Commercial Terms

• MOQ: 500 meters or 1 metric ton (whichever is greater)
• Price Basis: FOB Shanghai / Ningbo / Tianjin
• Lead Time: 25–40 days after order confirmation and deposit (depending on quantity and specifications)
• Payment: T/T or L/C at sight