Alloy Steel High Frequency Welded Fin Tubes
Alloy steel high frequency welded fin tube is a special tube that tightly connects the fin and the base tube through high frequency welding technology, which is mainly used to improve heat exchange efficiency. The core lies in high frequency welding technology, which uses high frequency current to generate heat on the metal surface to achieve firm welding of the fin and the base tube.
Structure and principle of alloy steel high frequency welded fin tube
Alloy steel high frequency welded fin tube consists of a base tube and fins. The base tube usually adopts seamless steel pipe, which has high strength and corrosion resistance and can withstand certain pressure and temperature. The fin is welded on the outer surface of the base tube. Common materials are stainless steel and copper. Stainless steel has excellent corrosion resistance and high strength, and is suitable for environments with high requirements for corrosion resistance; copper is known for its excellent thermal conductivity and is suitable for occasions with extremely high requirements for heat dissipation efficiency.
Manufacturing process of alloy steel high frequency welded fin tube
High frequency welding technology uses the skin effect and proximity effect of high frequency current to highly concentrate heat on the surface of steel strip and base tube to achieve rapid heating. During the welding process, when high-frequency current passes through a metal conductor, the skin effect causes the current density to be concentrated on the surface of the conductor, and the proximity effect causes the current to flow on the adjacent side of the conductor, thereby accurately achieving welding.
Application fields of alloy steel high-frequency welded finned tubes
Alloy steel high-frequency welded finned tubes are widely used in multiple industrial fields, including HVAC, energy and power, chemical and petroleum, etc.
In the field of HVAC, such as air-conditioning condensers and evaporators, fins enhance air-side heat exchange; in the field of energy and power, such as boiler economizers and air preheaters, high-temperature flue gas heat exchange is handled; in the field of chemical and petroleum, such as reactors and reboilers, highly corrosive or fluids are handled.
High-frequency welded finned tubes require precise material selection in chemical applications: 316L stainless steel resists chloride ions, Hastelloy alloys cope with strong corrosion, and Cr-Mo alloy steel tubes tolerate sulfides. Large-pitch fins or Teflon coatings can prevent scaling and ensure long-term and stable operation of equipment.
In the chemical industry, high-frequency welded finned tubes are widely used in heat exchangers, radiators, coolers and other equipment due to their efficient heat transfer performance. However, the chemical environment is often characterized by strong corrosion, complex media, and variable working conditions. Therefore, the following matters should be noted during application to ensure safe and efficient operation of the equipment:
Select the material of high-frequency welded finned tubes according to the characteristics of the medium
Chemical media may contain acids (such as sulfuric acid, hydrochloric acid), alkalis (such as sodium hydroxide), salt solutions, organic solvents or corrosive gases (such as chlorine, sulfides), and materials with matching corrosion resistance should be selected:
Conventional corrosive media: 304/316 stainless steel finned tubes can be selected, of which 316L has stronger corrosion resistance to chloride ions and organic acids.
Strongly corrosive environment: Use nickel-based alloys (such as Hastelloy), titanium alloys or copper-nickel alloys (such as B30) to avoid leakage caused by corrosion perforation of ordinary carbon steel.
High temperature, high pressure and sulfur-containing media: Select Cr-Mo alloy steel pipes (such as 15CrMo) that are resistant to high temperature sulfide corrosion.
Avoid electrochemical corrosion between materials and media: If the media contains electrolytes, the materials of the fin tube and the tube sheet should be as close as possible to reduce the potential difference.
High-frequency welded fin tube medium scaling and sticky substances
If the medium is prone to scaling (such as aqueous solutions containing calcium and magnesium ions) or has high viscosity (such as polymer melts), the fin structure needs to avoid scaling. You can choose:
Large-pitch fins (such as fin spacing ≥ 5mm) or serrated or spiral fins to reduce dirt deposition;
Smooth the fin surface (such as electroplating, spraying Teflon) to reduce the adhesion of the medium.