There are many classification methods of rolls, mainly including: (1) According to the product type, there are strip steel rolls, section steel rolls, wire rolls, etc.; Finishing rolls, etc.; (3) According to the function of the rolls, there are scale breaking rolls, perforation rolls, leveling rolls, etc.; (4) According to the material of the rolls, there are steel rolls, cast iron rolls, carbide rolls, ceramic rolls, etc.; (5) According to The manufacturing methods are divided into casting rolls, forging rolls, surfacing rolls, sleeve rolls, etc.; (6) According to the state of the rolled steel, there are hot rolls and cold rolls. Various classifications can be combined to make the rolls have a clearer meaning, such as centrifugally cast high-chromium cast iron work rolls for hot-rolled strips.