How to Prevent Fin Detachment at High Temperature? — H-Type and Perforated L-Type Finned Tubes Ensure Stronger Bonding

In high-temperature environments such as power plant economizers, waste heat recovery systems, and industrial boilers, conventional spiral-wound fin tubes often suffer from fin detachment, weld fatigue, and oxidation. These issues gradually reduce the heat transfer area, decrease overall thermal efficiency, and shorten equipment lifespan. To overcome these challenges, Zhongyue Metallurgy has developed a new generation of H-type welded fin tubes (H Fin / HH Fin Tube)and perforated L-type fin tubes (Perforated L Fin Tube) designed for enhanced mechanical bonding and long-term thermal stability.

The H-type finned tube features rectangular fins welded directly onto the base tube using full-penetration welding. This design ensures strong metallurgical bonding between the fin and the tube, with no gaps or weak points that could loosen under repeated heating and cooling cycles. Compared with traditional rolled fins, the H-type welded structure achieves up to 40% higher bonding strength and can operate reliably above 400°C for extended periods. The square geometry also increases the effective heat transfer area and reduces air resistance, optimizing performance for coal-fired, waste-heat, and petrochemical boilers.

Meanwhile, the perforated L-type fin tube adopts a unique slotted or wheel-type design that enhances heat dissipation and allows for minor expansion without cracking the weld. These perforations reduce thermal stress concentration and improve airflow turbulence, resulting in better soot shedding and self-cleaning capability. In high-dust or corrosive gas atmospheres, the perforated L fin configuration extends the maintenance interval by over 30%, maintaining stable thermal performance.

Both H-type and perforated L-type fin tubes can be manufactured using carbon steel, alloy steel, or stainless steelmaterials such as A106, A179, 20G, TP304, or 12Cr1MoVG. Zhongyue’s advanced finning machines ensure accurate control of fin thickness (1.5–3.5 mm), pitch (≥10 mm), and tube length (up to 18 meters). The outer surface is coated with red oxide zinc phosphate primer, and the inner wall is protected with a volatile corrosion inhibitor (VCI) for enhanced corrosion resistance.

By integrating full-penetration welding, precision alignment, and dual anti-corrosion coating, Zhongyue’s H-Type and Perforated L-Type Finned Tubes provide an ideal solution to prevent fin detachment and extend heat exchanger service life. They have become the preferred choice for customers seeking high-strength, energy-efficient, and maintenance-friendly heat transfer solutions in demanding industrial environments.