1. Pickling

Hot-rolled coils undergo an advanced pickling process, where scale breakers and hydrochloric acid solutions effectively remove surface scale and oxide layers. This process ensures a clean and uniform surface by eliminating potential defects, providing an optimal foundation for subsequent cold rolling operations.

2. Cold Rolling

After pickling, steel coils are processed through high-precision tandem cold rolling mills to achieve the required thickness, typically reducing the original material thickness by 40%–90%. Advanced automated process control systems enable precise shape adjustment, superior dimensional accuracy, and consistent product quality.

3. Electrolytic Cleaning

Electrolytic cleaning is applied to remove residual rolling lubricants, oils, and surface contaminants from cold-rolled steel. This ensures a clean surface condition and prepares the material for the subsequent annealing process.

4. Annealing

Annealing is a critical heat treatment process that restores the steel’s mechanical properties and enhances its formability. Through advanced batch annealing and continuous annealing technologies, SHOUYUAN produces cold-rolled steel products with excellent deep-drawing performance, high tensile strength, and superior surface quality.

5. Skin Pass Rolling

As the final finishing process, skin pass rolling improves surface quality, flatness, and mechanical properties by eliminating minor surface imperfections such as stretch marks. This process produces a smooth, bright, and uniform surface finish while achieving an additional thickness reduction of approximately 1%.