ASTM A213 TP11 T21 T91 With Carbon Steel Fin Hf Welding Fin Tube

ASTM A213 TP11 carbon steel finned high-frequency welded finned tubes are highly efficient bimetallic heat exchanger components designed for high-temperature, high-pressure applications. They combine the excellent corrosion and oxidation resistance of an alloy inner tube with the economical thermal conductivity of carbon steel outer fins.

The core pressure-bearing tube is manufactured to ASTM A213 TP11, a chromium-molybdenum-ferritic alloy steel with excellent strength and oxidation resistance at temperatures up to approximately 600°C, making it ideal for boiler and heat exchanger applications. This base tube is then integrally bonded to the carbon steel fins using a high-frequency (HF) welding process, creating a metallurgical bond that minimizes the heat-affected zone, ensuring optimal heat transfer efficiency and mechanical durability.

Used primarily in waste heat recovery systems, economizers, air preheaters, and process heaters in power generation, petrochemical, and industrial boiler plants, this composite structure effectively extracts heat from corrosive flue gases—the alloy lining resists internal steam/water corrosion and external acid dew-point corrosion, while the carbon steel fins provide a large, economical surface area to maximize heat extraction from the airstream.

Chemical Composition – ASTM A213 T11 (Base Tube)

Mechanical Properties – ASTM A213 T11

Fin Characteristics – Serrated Fin

Application

ASTM A213 TP11 carbon steel finned high-frequency welded finned tubes are primarily used to construct high-efficiency heat exchange equipment operating in high-temperature, high-pressure, and corrosive flue gas environments.

This bimetallic tube is specifically designed for use in waste heat recovery systems, economizers, and air preheaters within power generation boilers and industrial process heaters. In these critical applications, the inner alloy tube (ASTM A213 TP11) provides the necessary strength and resistance to oxidation and corrosion from internal high-pressure steam/water and external condensing acid gases.

At the same time, the carbon steel fins bonded by high-frequency welding significantly increase the heat transfer surface area in a cost-effective manner, effectively extracting residual heat energy from hot exhaust gases, thereby improving overall system efficiency and reducing fuel consumption.

This composite design is also widely used in process gas heaters and reformers in the petrochemical industry, providing a durable and economical solution for recovering heat from corrosive fluids, significantly reducing operating costs while ensuring long-term reliability under demanding thermal and mechanical stresses.