Abstract: In view of the frequent slipping and strip breakage problems of high magnetic induction oriented silicon steel (Hi⁃B steel) during the high⁃speed rolling process of the twenty⁃high reversing cold rolling mill, this article systematically analyzes the slipping mechanism and main influencing factors based on the actual production conditions of the production line. Research shows that slippage is mainly caused by factors such as the significant decrease in work roll surface roughness with increasing rolling passes, excessive pass reduction, mismatch of front and rear tension systems, and excessive oil film thickness due to high emulsion concentration. To this end, three key process optimization measures were proposed: increasing the initial roughness and grinding groove depth of the work roll by adjusting the grinding process parameters to enhance the friction between the roll and the strip; optimizing the tension system, appropriately increasing the front tension and reducing the rear tension to expand the front slip zone and stable deformation zone; reducing the emulsion concentration and controlling the oil film thickness. After implementing the above measures, the slippage and strip breakage rates during the cold rolling process of Hi⁃B steel were significantly reduced, and rolling stability and production efficiency were effectively improved.

Key words: Hi?B Steel, cold?rolling, skidding, roughness, tension, emulsion concentration, process optimization