What is cold-rolled sheet?

Cold-Rolling Characteristics:

Cold-rolled sheets and coils are produced using hot-rolled coils as raw material, processed via rolling at room temperature (below the recrystallization temperature). They are available in both sheet and coil forms and are produced by numerous domestic steel mills, such as Baosteel, WISCO, and Ansteel. Products delivered as individual sheets are known as steel plates (or flat sheets/box sheets), while those delivered in long, continuous rolls are known as steel strips (or coils).

Definition of Cold Rolling:

Technically, it is rolling performed below the recrystallization temperature, though it is generally understood as rolling materials at ambient temperature. Aluminum cold rolling is categorized into sheet rolling and foil rolling; products with a thickness of 0.15 mm or greater are classified as sheets, while those under 0.15 mm are classified as foils. European and American manufacturers typically utilize 3 to 6-stand tandem rolling mills for cold-rolling operations.

Production Process: Since no heating is involved during production, defects common to hot rolling—such as pitting and iron oxide scale—are avoided, resulting in superior surface quality and a high-quality finish. Additionally, cold-rolled products offer high dimensional accuracy, with properties and microstructures capable of meeting specific application requirements, such as electromagnetic performance and deep-drawing capabilities.

Specifications: Thickness: 0.2–4 mm; Width: 600–2,000 mm; Sheet Length: 1,200–6,000 mm.

Grades: Q195A–Q235A, Q195AF–Q235AF, Q295A(B)–Q345A(B); SPCC, SPCD, SPCE, ST12–15; DC01–06.

Properties: Primarily utilizes low-carbon steel grades; requires good cold-bending and welding characteristics, as well as adequate stamping performance. Applications: Cold-rolled steel sheets and strips have a wide range of uses, including in automotive manufacturing, electrical products, rolling stock, aerospace, precision instruments, and food canning.

“Cold-rolled thin steel sheet” is the formal term for cold-rolled sheets made from ordinary carbon structural steel; they are commonly referred to as “cold-rolled sheets” or simply “cold sheets.” These sheets are produced by taking hot-rolled strips of ordinary carbon structural steel and subjecting them to further cold rolling to achieve a thickness of less than 4 mm. Because the rolling process takes place at room temperature, no iron oxide scale is formed, resulting in superior surface quality and high dimensional accuracy. Furthermore, following annealing treatment, their mechanical and processing properties surpass those of hot-rolled thin sheets. Consequently, they have gradually replaced hot-rolled thin sheets in many sectors, particularly in the home appliance manufacturing industry.

Applicable Grades: Q195, Q215, Q235, Q275; SPCC (Japanese grade); ST12 (German grade).