Cold-rolled products are flat-rolled metal materials manufactured from hot-rolled coils as raw material, processed at room temperature through processes such as rolling and annealing. The production process encompasses stages including pickling, cold rolling, and coating; major product categories include full-hard coils, galvanized sheets, and aluminum-zinc coated sheets. Product thicknesses range from 0.1 to 8.0 mm, with widths reaching up to 2,000 mm. These products are widely utilized in sectors such as automotive manufacturing, architectural decoration, home appliance production, and food packaging materials; notably, automotive-grade steel sheets account for over 50% of the cold-rolled product supply in developed nations.
Through the cold-rolling process, these products achieve a high surface finish (roughness Ra ≤ 0.8 μm) and precise dimensional control (thickness accuracy within ±5 μm). They exhibit superior mechanical properties, including high yield strength (reaching up to the 1400 MPa class) and excellent elongation (up to 28%). Production processes are continuously being optimized, incorporating innovative advancements such as rapid heating/cooling technologies (temperature deviation ≤ ±15°C), precise coating control (deviation < 3.2 g/m²), and the rolling of differential-thickness sheets.
Technological advancements within the industry include patented technologies-such as weld seam tracking devices and automated thickness control methods-as well as practical applications like AI-driven production scheduling systems and AI models for coating control, all of which serve to enhance production precision and efficiency. Driven by both government policies and market demand, cold-rolling industry capacity is increasingly concentrating in regions such as East, North, and South China. Concurrently, the product structure is evolving toward a high-end, eco-friendly, and intelligent trajectory, with a growing focus on high-strength steels and specialized steels for new energy vehicles.