Rolling mill rolls and roll bearings base are the core parts of the whole working stand of the rolling mill, and the roll is the main part of the direct rolling mill. In the process of rolling, the roll contacts with the workpiece directly, forcing the plastic change of the workpiece. At the same time, the roll bears a huge rolling pressure, and the stress changes with time due to the rotation of the roll itself. Under hot rolling conditions, the rolls are heated by contact with high temperature rolled parts, and at the same time, they are cooled by water and quenched by the combination of cold and hot.

There are grooves on the roll body of the rolling mill. Passes are arranged according to the requirements of section steel rolling technology. Passes are designed to meet the requirements. The rolls should have sufficient strength, stiffness, and good wear resistance. At the same time, the hardness of the working surface of the roll is also one of the main quality indexes of the roll.

The rolls of rolling mill consist of three parts: roll body, roll diameter and roll head. The roll diameter is installed in the bearing, and the rolling force is transmitted to the stand through the bearing seat and screwdown device. Roll head and connecting shaft are connected to transfer rolling torque; roll body is the part where the roll contacts directly with the workpiece; roll diameter is the supporting part of the roll, and the roll is supported on the bearing by two-axle diameters of the roll body. The junction between roll body and roll diameter is the place where stress concentration is concentrated and the weak link of roll strength. The roll diameter and the roll body must be properly grounded.

The quality requirement of rolling mill rolls is very high because it determines the quality of rolling mill work, productivity and output quality. Considering the complex working conditions of rolls, high strength cast steel rolls, forged steel rolls and high strength cast iron rolls are used for rolling mill rolls. In this way, the roll can be applied for a long time without breaking, and it is surface wear is also very small.