Cold-rolled products are manufactured using hot-rolled coils as raw material and are rolled at ambient temperature-specifically, below the recrystallization temperature. For uncoated cold-rolled flat products, the cross-sectional area is reduced by no less than 25% during the cold-rolling process; however, for flat products with a width of less than 600 mm-as well as certain special-grade steels-products with a cross-sectional area reduction of less than 25% may also be included in this category.
Based on material type, cold-rolled products can be classified into cold-rolled steel sheets, cold-rolled stainless steel sheets, and cold-rolled aluminum sheets. Classified by thickness, they are categorized as thin sheets, medium sheets, or thick sheets; specifically, cold-rolled thin sheets have a thickness of less than 3 mm, while cold-rolled thick sheets have a thickness of 3 mm or greater (with the exception of electrical steel). Based on surface treatment techniques, they can be further classified into rust-resistant sheets, coated sheets (e.g., galvanized, color-coated, etc.), passivated sheets, and others.
In terms of product form, cold-rolled thin and thick sheets are produced with free-spreading edges and are supplied in a flat form, with a width of no less than 600 mm. Cold-rolled steel strips are delivered in coil form and are further subdivided into cold-rolled wide strips (nominal width of no less than 600 mm), slit cold-rolled wide strips (rolled width of no less than 600 mm, but with a nominal width of less than 600 mm after edge trimming), and cold-rolled narrow strips (nominal width of less than 600 mm).