Recently, Shanxi Jianlong achieved a key technological breakthrough in the manufacturing of high-end galvanized strip steel (Price) , successfully overcoming the challenge of surface uniformity in wide-width extreme specifications and achieving a high degree of consistency in the transverse roughness of the entire strip steel surface. This marks a solid step forward for the company in its green intelligent manufacturing transformation towards high precision and low energy consumption.
As a key raw material possessing both high strength and excellent corrosion resistance, the surface finish and coating uniformity of galvanized steel strip (Introduction) directly affect the processing pass rate and service life of downstream hardware products, building decorations, and home appliance panels. When customers receive materials, problems such as bending cracks, coating peeling, and stamping flaking often stem from the quality of the substrate. The traditional approach is reactive, meaning that problems are discovered after plating and rework is performed. This is costly, inefficient, and doesn't address the root cause.
Shanxi Jianlong adopted a different approach this time—starting from the source. Hot-rolled substrate is the step before galvanizing and is the "starting line" that determines the uniformity of the transverse roughness across the entire strip. The company's technical team systematically and meticulously iterated on the crown and profile curve of the roughing rolls, and collaboratively optimized the dynamic matching degree of the rolling force and rolling speed field. This effectively eliminated the uneven distribution of transverse internal stress in the wide deformation zone of the strip, ensuring that the hot-rolled substrate achieves a smoother base surface with higher activation energy before entering the galvanizing process.

This change, seemingly a front-end modification, actually eliminates the quality bottleneck in all subsequent processes. The improvement in the base material provides highly consistent interface conditions for the subsequent hot-dip galvanizing process. The convergence of the lateral physical morphology of the substrate surface makes the zinc liquid adhere more evenly and densely, eliminating the hidden danger of uneven coating caused by differences in microstructure at its source. The product exhibits a smooth and uniform high-grade appearance, and the yield of superior products also increases accordingly.
Another crucial point is that with stable coating quality, zinc layer adhesion efficiency is significantly improved, allowing for precise adjustment of the thickness. Shanxi Jianlong recalibrated and precisely adapted its coating thickness control model, ensuring that neutral salt spray testing and bending performance fully exceeded existing internal control standards and national standards. This enabled the production line to achieve a rational and precise reduction in zinc layer thickness.
Calculations show that, based on a monthly production capacity of 15,000 tons, this process can save over ten million yuan annually, while significantly reducing the consumption of precious zinc – achieving both environmental and economic benefits simultaneously.
In the future, Shanxi Jianlong will always adhere to the business philosophy of "benefiting others and oneself, and sustainable operation", continue to focus on the high value-added product track, delve into the core technology breakthrough, and bring a higher quality upgrade experience to downstream customers across the entire chain with more competitive high-quality strip steel products. It will move forward steadily in the process of industrial synergy and contribute more "Jianlong" strength to the high-quality development of the industry.