HFW High Frequency Welded Serrated Fin Tube For Boiler Economizer

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