Structure Of Rolled Finned Stainless Steel Tube
The structure of a wound-fin stainless steel tube mainly consists of four parts: the base tube, the wound fins, the connection method, and the overall layout. Through precise design, it achieves efficient heat transfer and long-term stable operation.
This structure involves spirally or continuously winding metal fins onto a stainless steel base tube, forming an integrated heat exchange surface, and is widely used in industrial heat exchange equipment.
Fins (Heat Exchange Enhancement Components): Fins are made of thin stainless steel strips (0.2–0.5 mm thick) and tightly bonded to the outer surface of the base tube through a winding process.
The shape is mostly spiral or straight, with an adjustable spacing of 2–15 mm to optimize airflow distribution and heat exchange efficiency.
The function of fins is to significantly increase the heat dissipation area, thereby significantly improving the heat exchange capacity per unit length of tube, which can be 3–6 times higher than that of bare tubes.
Base Tube (Core Load-Bearing Structure): The material is usually seamless or welded stainless steel tubing, commonly including SUS304 and SUS316L, which possesses good corrosion resistance and mechanical strength.
The base tube is responsible for transporting high-temperature fluids (such as steam, flue gas, and heat transfer oil). Appropriate tube diameter and wall thickness must be selected according to the working pressure and temperature to ensure safety and reliability.
Connection Method (Determines Structural Stability)
High-Frequency Welding: The most common process, using high-frequency current to instantly heat the contact points between the fins and the base tube, achieving a metallurgical bond. This results in high weld strength and low thermal resistance.
Mechanical Winding + Spot Welding: The fins are first wound and fixed, then reinforced with spot welding. Suitable for low-temperature and low-pressure applications, this method is less expensive but offers slightly weaker bonding strength.
Integral Rolling: Used in a few high-end products, this method involves integrally molding the fins and base tube without weld seams. It offers stronger corrosion resistance and is suitable for high-sulfur and high-chlorine environments.
