Product Specification

Premium High Frequency Welded Finned Tube: TP347H Base & Carbon Steel Fin

Detailed Introduction to TP347H & Carbon Steel HFW Finned Tube

The High Frequency Welded (HFW) Finned Tube combining an ASTM A213 TP347H stainless steel base tube with a Carbon Steel (CS) fin is an advanced heat transfer component designed for highly corrosive and high-temperature environments. By utilizing high-frequency resistance welding, the carbon steel fin is metallurgically bonded to the TP347H base tube. This bimetallic combination perfectly balances superior high-temperature creep resistance inside the tube with cost-effective, high-efficiency thermal conductivity on the outside, making it an ideal choice for heavy industrial heat recovery systems.

Finned Tube Structure: TP347H Base, CS Fin & Welding Process

The exceptional performance of this finned tube relies on its unique bimetallic structure and advanced manufacturing process:

• Base Tube (ASTM A213 TP347H): TP347H is a high-carbon austenitic stainless steel stabilized by Niobium (Nb). It provides exceptional resistance to intergranular corrosion and high-temperature oxidation, ensuring the safe flow of high-pressure, high-temperature internal fluids.

• Fin Material (Carbon Steel / CS): Commercial grade carbon steel is selected for the fins due to its excellent thermal conductivity and formability, providing maximum extended surface area for heat exchange at a competitive cost.

• Attachment / Welding Process (HFW): Unlike mechanically embedded fins, we use High Frequency Resistance Welding (HFRW). A high-frequency current melts the fin base and the outer surface of the TP347H tube simultaneously, forging them together under pressure. This creates a 100% metallurgical bond with zero thermal contact resistance, eliminating the risk of fin loosening even under severe thermal cycling.

Chemical Composition of TP347H Base Tube and Carbon Steel Fin

Accurate material control is the core of our quality. Below is the chemical composition for the TP347H stainless steel base tube and standard carbon steel fin.

Table 1: Chemical Composition of ASTM A213 TP347H Base Tube (%)

Table 2: Typical Chemical Composition of Carbon Steel Fin (%)

Dimension and Tolerance Range for TP347H / CS Finned Tubes

We offer comprehensive customization to meet your specific heat exchanger drawings. Our manufacturing tolerances strictly comply with international standards to ensure easy assembly.

Table 3: Manufacturing Capabilities and Tolerances

Performance Advantages of TP347H Base & Carbon Steel Fin Combination

• Optimal Cost-Efficiency: Utilizing Carbon Steel for the fins dramatically reduces the overall cost compared to full stainless steel finned tubes, while the TP347H base guarantees the critical anti-corrosion needs for the internal fluid.

• Maximum Heat Transfer Rate: The HFW process ensures a continuous metallurgical bond, meaning there is zero air gap between the TP347H base and CS fin, maximizing heat conduction.

• High-Temperature Stability: The Niobium addition in TP347H prevents carbide precipitation during welding, maintaining strength and corrosion resistance at elevated temperatures (up to 800°C / 1470°F for the tube side).

• Self-Cleaning & Low Fouling: The smooth weld seam and precise fin pitch design reduce ash accumulation, making it ideal for exhaust gas recovery.

Detailed Application Fields for TP347H & CS Bimetallic Finned Tubes

Due to the specific metallurgical properties of the TP347H base and Carbon Steel fins, these high-frequency welded tubes are widely deployed in the following industrial sectors:

• Power Generation: Economizers, Heat Recovery Steam Generators (HRSG), and boiler components where high-temperature exhaust gases are present.

• Petrochemical Industry: Fired heaters, convection section tubes, and heavy oil processing heat exchangers.

• Waste-to-Energy Plants: Flue gas coolers and incinerator heat recovery systems where the base tube requires high creep-rupture strength.

• Wood & Paper Mills: Steam air heaters and industrial drying equipment.

Our Advantages and Experience in Manufacturing TP347H/CS Finned Tubes

As a premier manufacturer of industrial heat transfer components, we bring decades of expertise to every project:

• Extensive Manufacturing Experience: With over 15 years in the heat exchanger industry, we have successfully exported hundreds of kilometers of bimetallic HFW finned tubes globally.

• Strict Quality Control (QC): We perform 100% Hydrostatic Testing, Eddy Current Testing (ECT), and Weld Peel Tests on our TP347H/CS tubes to guarantee flawless metallurgical bonding.

• Global Certifications: Our production facility operates strictly under ISO 9001 and ASME standards, ensuring your equipment meets international safety codes.

• Custom Engineering Support: From raw material sourcing (premium TP347H billets) to custom fin pitch calculations, our engineering team provides end-to-end technical support to maximize your boiler's thermal efficiency.

Contact our engineering sales team today to get a quick quote for your custom TP347H & Carbon Steel High Frequency Welded Finned Tubes!