Abstract: The development and research practice of CAS process for  tinplate in Shougang Jingtang were introduced. By reforming the bottom blowing pipeline, optimizing the argon flow control and inclusion modification treatment, the CAS refining process low nitrogen control technology, CAS bottom blowing nitrogen increasing technology and CAS ladle top slag upgrading technology were developed. The high-efficiency and low-cost CAS process for tinplate was successfully opened. The tinplate produced by CAS process fully meets the quality requirements, which not only ensures the quality of tinplate, but also relieves the pressure of RH process, and reduces the production process cost.

Key words: CAS process, bottom blowing flow, pipeline reconstruction, inclusion modification treatment, cost reduction