Cold-rolled steel and aluminum coils are essential materials in modern industrial manufacturing. Thanks to their high dimensional accuracy, excellent surface quality, and consistent mechanical properties, they are widely used in automotive, electrodomésticos, construcción, and precision manufacturing industries.
Cold Rolling Process Flow
Full Process Flow Diagram:
Pickling → Cold Rolling → Annealing → Skin Pass / Tension Leveling → Coiling
Each step plays a critical role in determining surface quality, thickness accuracy, and mechanical performance.
Paso 1: Preparación de Materia Prima (Pickled Hot Rolled Coils)
Cold rolling starts with high-quality hot rolled coils that undergo pickling treatment.
Purpose of Pickling:
Pickling removes oxide scale and rust from the surface, ensuring good ductility and a clean surface for cold rolling.
Resultado:
A smooth and uniform surface that forms a reliable foundation for downstream processing.
Paso 2: Entry Section and Tension Control
At the entry section of the cold rolling line, coils are connected and tension is precisely controlled.
Coil welding or threading ensures continuous operation
Stable tension improves flatness and thickness uniformity
Proper entry setup reduces downtime and increases line efficiency
Paso 3: Cold Rolling (Core Process)
Cold rolling is the core process where thickness reduction and strength improvement occur.
Rolling Stands (4-alto / 6-high mills):
Enable precise thickness control while minimizing surface defects and shape deviation.
Pass Schedule & Reduction Ratio:
Optimized based on material grade and final thickness.
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