A213 T22 Alloy Steel Serrated HFW Finned Tube, High Frequency Welded Fin Type, Used For Boiler Economizer


Overview

The term "A213 T22 Alloy Steel Serrated HFW Finned Tube" refers to a specific type of finned tubing used primarily in heat exchangers and boiler applications, particularly in high-temperature and high-pressure environments. Here's a breakdown of each part of the term to explain what it means:

1. A213 T22

• A213: This is an ASTM specification that covers seamless ferritic and austenitic alloy-steel boiler, superheater, and heat-exchanger tubes.

• T22: A grade within the A213 specification. T22 is a 2.25% Cr – 1% Mo (chromium-molybdenum) alloy steel, known for:

  • Good high-temperature strength

  • Excellent corrosion and oxidation resistance

  • Widely used in power plants, refineries, and petrochemical industries

2. Serrated

• Indicates that the fin base or tube surface is serrated (has ridges or grooves).

• Serrations enhance the bonding strength between the tube and the fin (important in HFW finning).

• They also increase heat transfer efficiency by promoting turbulent flow on the finned surface.

3. HFW (High-Frequency Welded)

• The fins are attached to the tube using high-frequency resistance welding.

• This process produces a strong metallurgical bond with minimal distortion, suitable for continuous and automated production.

• HFW finned tubes are known for their durability and consistent quality.

4. Finned Tube

• Tubes with external fins to increase the surface area for heat transfer.

• Used in air-cooled heat exchangers, waste heat recovery systems, and boilers.

• Finning improves the efficiency of thermal transfer between fluids and gases.

5. Applications of A213 T22 Alloy Steel Serrated HFW Finned Tube

• Power generation (boilers, economizers, superheaters)

• Petrochemical and refinery heat exchangers

• Waste heat recovery systems

• Industrial process heaters