Abstract: This paper examines the evolving trends in the digital transformation of the steel industry and provides a systematic overview of the research and engineering achievements of the State Key Laboratory of Digital Steel(DSL) in the domain of steel rolling. A series of high-fidelity digital twin models integrating data, physical mechanisms and empirical domain knowledge have been developed for critical production processes, including hot rolling, cold rolling and heat treatment. Intelligent optimization methods tailored for industrial production environments have been designed and implemented in large-scale steel enterprises both domestically and internationally. These innovations have yielded significant improvements in quality metrics, particularly in three-dimensional dimensional accuracy, microstructure, and mechanical properties. Finally, the paper outlines the future research and application prospects of "AI + steel rolling".