Continuous casting GCr15 bearing steel wire rod carbide mesh control method

摘要

The present invention discloses a continuous casting GCr15 bearing steel wire rod carbide mesh control method. The control method performs design optimization on the chemical composition of GCr15. Before inserting the billet, it is evaluated and classified based on the superheat degree and macro structure. According to the slab material classification, the input material gauge is clarified, and special control is performed on the heating process, and the relegated slab material properly extends the furnace temperature ≥1150℃ high temperature section time, while increasing the initial rolling temperature, and high temperature diffusion for a long time Efforts are made to mitigate slab segregation under conditions. Improve the coil air cooling process, in the air cooling cooling process, the coil is adjusted according to the gauge size. From the spinning temperature, it is rapidly cooled to 700° C. or less, and the coil is maintained at about 630 to 700° C. for a certain period of time and then put back into the shield to implement effective control of the carbide network.