Method for preparing forged SHSS (Semi-high Speed Steel) rolling mill roll by radial rotary precision forging

The invention relates to a preparation method of a rolling mill roll, and in particular relates to a method for preparing a forged SHSS (Semi-high Speed Steel) rolling mill roll by radial rotary precision forging. The method is characterized in that a blank of the forged SHSS rolling mill roll is subjected to high-temperature diffusion, wherein the temperature is 1230 to 20 DEG C and maintained for 30 to 35 hours; then the temperature is decreased to be not greater than 1180 DEG C; an RF70 type precision forging machine is used for performing radial rotary forging and forming through four hammer heads, so as to obtain the forged SHSS rolling mill roll. Thee forged piece is uniformly stressed with the four sides during the precision forging and forming process, so that the structure is uniform and small by being compared with that of free forging, the plasticity and toughness, endurance strength, fatigue resistance and other indexes of the forging piece can be improved, and the brittle transition temperature c