Parametric Analysis of Water Jet Descaling Efficiency of Reheated Continuously Cast Thin Slab

Efficient oxide scale removal is critical for maintaining surface quality and process efficiency in steel manufacturing. This study optimizes water jet descaling by evaluating the performance of flat and rotary jet nozzles under varying process parameters. Using a combined approach of experimental analysis and computational fluid dynamics, it investigates the influence of pressure (138–275 bar), lead angle (0°, 15°, 25°), working distance (50–100 mm), and spray angle (15°–25°) on descaling efficiency. Findings indicate that flat jet nozzles achieve superior performance at short working distances due to concentrated impact forces, while rotary jet nozzles sustain efficiency over extended distances through dynamic droplet attack angles. A critical threshold for flat jet nozzles is identified, beyond which scale removal efficiency declines sharply. The study confirms an optimal 15° lead angle for flat jets, aligning with industrial best practices. By integrating principles of fluid mechanics, impact dynamics, and erosion mechanics, it establishes a robust framework for nozzle parameter optimization. These insights contribute to the development of adaptive descaling systems capable of real‐time adjustments for challenging steel grades, enhancing scale removal effectiveness in continuous casting and hot rolling operations.