qualità tubo di aletta dello scambiatore di calore & Metropolitana di aletta espelsa fabbrica

Fast project turnaround is critical for EPC contractors, boiler manufacturers, and heat exchanger integrators. Zhongyue Metallurgy meets this demand through its six fully automated production lines for H-Type and L-Type finned tubes, achieving a daily capacity of 20 tons and monthly production exceeding 600 tons. The facility can produce tube diameters from 25mm to 73mm and lengths up to 18 meters, covering multiple fin configurations — including H-type, perforated L-type, and wheel-type L fins. Advanced feeding, welding, and straightening systems guarantee consistent weld seams and high dimensional accuracy, reducing custom production time by more than 30%. Each tube undergoes hydrostatic and air pressure testing to ensure structural integrity. The exterior is coated with zinc phosphate primer, and the interior is protected by VCI anti-corrosion treatment, ensuring rust-free delivery even after long-distance transport or storage. Whether used in boiler economizers, waste heat recovery systems, or marine energy applications, Zhongyue can complete design, production, and shipment within 2–3 weeks, enabling customers to meet tight construction deadlines. With a combination of high-efficiency manufacturing, strict quality control, and flexible customization, Zhongyue Metallurgy has become a trusted global supplier of finned tubes, delivering fast, reliable, and application-specific heat transfer solutions to industries worldwide.

High-pressure steam systems are exposed to extreme mechanical stress, where tube burst or fatigue failure can cause costly shutdowns and safety risks. To ensure maximum strength and reliability, Zhongyue Metallurgy manufactures H Fin Tubes using 20G or 12Cr1MoVG pressure-resistant steel as the base material, combined with 3.5mm-thick welded fins and wheel-type L-fin structural reinforcement. Each tube undergoes full-penetration automatic welding, producing uniform weld seams with high bonding strength. The resulting structure achieves a working pressure resistance of up to 9.8 MPa. The H-shaped fin geometry not only expands the heat exchange area but also enhances mechanical stiffness, improving resistance to thermal deformation and vibration by over 25%. Every batch is subjected to hydrostatic, pneumatic, and eddy-current testing to ensure leak-free performance. Externally, the tubes are coated with red oxide zinc phosphate primer, and internally, they’re treated with VCI corrosion inhibitors to prevent oxidation during long-term service. These high-strength finned tubes are widely used in coal-fired power plants, high-pressure boilers, and chemical heating systems, helping customers achieve safer, more stable, and energy-efficient operations. Zhongyue’s pressure-resistant H Fin Tube solution delivers superior reliability, extended lifespan, and reduced maintenance costs in demanding industrial environments.

Uneven airflow within heat exchangers can cause local overheating, reduced thermal efficiency, and premature equipment wear. This often stems from inconsistent fin spacing or deformation during manufacturing. Zhongyue Metallurgy eliminates these problems through CNC stamping and automated welding integration, which ensures fin spacing precision within ±0.1mm. Both H-type welded fin tubes and Wheel-type L fin tubes maintain consistent channel geometry, allowing airflow to pass uniformly between fins and minimizing turbulence or flow blockages. Test data show a 15% reduction in gas flow resistance and a 20% increase in heat transfer uniformity compared to conventional finned tubes. The precise alignment of fins also reduces vibration and noise, improving the long-term stability of the entire heat exchange system. Fins can be produced from carbon steel, stainless steel, or alloy steel, with corrosion-resistant red oxide zinc phosphate coating on the exterior and VCI inhibitor protection on the interior. These ensure stable performance under high-temperature and high-humidity conditions. Zhongyue’s CNC-engineered H/L fin tubes are now widely used in boilers, economizers, and industrial heat recovery systems. With consistent geometry and optimized fluid dynamics, they offer higher thermal efficiency, improved reliability, and longer operational life.

When combining dissimilar metals—such as carbon steel tubes and stainless-steel fins—thermal expansion differences can lead to cracking or delamination after repeated heating cycles. Traditional welding methods often fail to maintain structural integrity under high-temperature fatigue. Zhongyue Metallurgy solves this issue using Composite Welding Technology, a proprietary process that precisely controls welding temperature and speed to balance internal stress between different metals. This method enables perfect metallurgical bonding between carbon steel base tubes and stainless-steel fins, whether they are H-type, wheel-type, or perforated L-type structures. Fatigue tests under 1,000 high-temperature cycles confirmed zero cracking or separation. The technology is especially effective with materials such as 20G, 12Cr1MoVG, TP304, and TP316L, ensuring long-term bonding strength at operating temperatures up to 600°C. Beyond mechanical stability, composite welding improves thermal conductivity, minimizes heat stress, and prevents long-term deformation. Combined with Zhongyue’s dual-layer corrosion protection system (external zinc phosphate coating + internal VCI inhibitor), these tubes deliver exceptional durability in corrosive or high-temperature environments. This innovation makes Zhongyue’s H/L finned tubes the most reliable choice for power boilers, petrochemical exchangers, and marine waste heat recovery systems, delivering long-lasting performance and unmatched thermal efficiency.

In coal-fired power plants, economizers, and waste heat recovery systems, cleaning difficulty is one of the most common issues that affect long-term performance. Traditional spiral fin tubes tend to trap soot and ash between tightly wound fins. Over time, high-temperature operation hardens these deposits, creating thermal resistance and forcing frequent shutdowns for manual cleaning. Zhongyue Metallurgy addresses this challenge with its advanced H-Type Finned Tubes and Perforated L-Type Finned Tubes, both designed for easy maintenance and high-pressure cleaning. The H-type fin features a straight-through arrangement with uniform spacing (fin pitch ≥10mm), allowing direct air-blowing or brushing during cleaning. The perforated L-type fin includes vent holes that create micro-turbulence during operation, naturally preventing dust adhesion and achieving self-cleaning performance without halting production. Additionally, the Wheel-Type L Fin Tube introduces enhanced airflow disruption, further reducing ash accumulation and maintaining efficient heat exchange. These designs significantly extend the cleaning interval, cutting maintenance frequency by over 30% and lowering downtime costs. Each tube is made from carbon steel, alloy steel, or stainless steel (A179, A210, TP304, 20G, 12Cr1MoVG, etc.) and can be manufactured up to 18 meters in length with fin thicknesses ranging from 1.5–3.5mm. The external surface is coated with a red oxide zinc phosphate primer for corrosion resistance, while the internal wall is protected with a VCI (Volatile Corrosion Inhibitor) layer for long-term cleanliness and protection. Field results show that Zhongyue’s H and Perforated L Fin Tubes improve maintenance efficiency, operational stability, and system reliability. They are widely used in power generation, industrial heating, and waste heat recovery systems, providing a superior solution for clean, efficient, and low-maintenance heat transfer.