Cold-rolled steel coils are steel products that have undergone a cold rolling process. Cold rolling is a manufacturing process in which hot-rolled steel is passed through rollers at room temperature, compressing and shaping it into thinner and more precise coils.

During cold rolling, the hot-rolled steel is first pickled to remove any scale or impurities on the surface. It is then passed through a series of rollers that apply pressure, reducing the thickness of the steel and improving its surface finish. This process also increases the strength and hardness of the steel.