Cold rolling mill roll: Rolls used for cold rolling are generally flat rolls for rolling sheets and strips. Cold rolls in a broad sense include work rolls that are in contact with the rolling stock and backup rolls that support them. Because backup rolls are self-contained, cold rolls are often referred to in a narrow sense as cold work rolls. The cold roll must have sufficient strength, uniform high hardness and surface quality to withstand extremely high rolling force, ensure sufficient wear resistance, and meet the requirements of rolling precision. Forged steel rolls that can be hardened to high hardness are used as cold rolls.