ASTM A376 TP347H Solid Finned Tube 11Cr Fins For Boiler Superheater and Reheater

ASTM A376 TP347H Solid Finned Tube 11Cr Fins For Boiler Superheater and Reheater

Our ASTM A376 TP347H HFW 11Cr Solid Finned Tube is a high-performance heat exchange component specifically engineered for harsh high-temperature and corrosive environments. Combining a premium base tube with high-chromium alloy fins, it delivers exceptional heat transfer efficiency, structural stability, and long-term durability, making it an ideal choice for critical industrial applications.

Core Specifications:

1. Base Tube: ASTM A376 TP347H Seamless Pipe
Conforms to ASTM A376 standard, grade TP347H (UNS S34709) — a niobium-stabilized austenitic stainless steel with high carbon content. This grade offers excellent resistance to intergranular corrosion in the temperature range of 427–816°C (800–1500°F) and superior creep strength at elevated temperatures up to approximately 850°C.

(1) Chemical Composition (wt%)

The addition of niobium (columbium) is a key feature, as it prevents intergranular corrosion by forming carbides instead of allowing chromium carbides to precipitate at grain boundaries.

(2)Mechanical Properties

These properties are typically verified after the pipe has been solution annealed and cooled under controlled conditions

2. Fin Type: HFW Solid Finned Tube
Fin Material: 11Cr

• Equipped with solid helical fins, which are continuously welded to the outer surface of the base tube via HFW process. This seamless attachment method maximizes the contact area between fins and the base tube, enhancing heat transfer efficiency and preventing fin detachment under extreme conditions.
• 11Cr alloy fins (containing approximately 11% chromium, such as grades P9, P11, or 12CrMoV). The 11Cr alloy boasts excellent high-temperature oxidation and corrosion resistance, along with good thermal conductivity and mechanical strength, perfectly complementing the TP347H base tube to ensure long-term stable operation.

3. Key Features of this combination

• Superior High-Temperature Performance: Resists oxidation and creep deformation at temperatures up to 850°C, suitable for long-term service in high-temperature equipment.
• Strong Corrosion Resistance: The TP347H base tube and 11Cr fins work together to provide excellent resistance to intergranular corrosion and harsh media corrosion, extending the product service life.
• High Heat Transfer Efficiency: The solid helical fins significantly increase the external surface area of the tube, effectively improving the heat exchange efficiency between the internal fluid and external gas/air.
• Reliable Structural Stability: HFW process ensures firm connection between fins and base tube, with good dimensional accuracy and mechanical strength, adapting to complex industrial operating conditions.

4. Typical Applications of ASTM A376 TP347H HFW 11Cr Solid Finned Tube

This product is widely used in various high-temperature industrial fields that require efficient heat transfer and corrosion resistance, including:

• Boiler superheaters and reheaters in power plants
• Heat exchangers in thermal power generation systems
• Petrochemical process heaters and refining equipment
• High-temperature waste heat recovery systems
• Other industrial equipment operating under harsh high-temperature and corrosive conditions