There are many classification methods for rolls, mainly including: According to the product type, there are strip steel roll, section steel roll, wire rod roll, etc; According to the position of rolls in the rolling mill series, they are divided into blank opening roll, roughing roll, finishing roll, etc; According to the roll function, it is divided into scale breaking roll, piercing roll, leveling roll, etc; According to the roll material, there are steel roll, cast iron roll, tungsten carbide rolls, ceramic roll, etc; According to the manufacturing method, it can be divided into casting roll, forging roll, surfacing roll, insert roll, etc; According to the rolled steel state, there are hot roll and cold rolls.