AN INNOVATIVE SLAG ENGINEERING APPROACH FOR IMPROVING DE- SULPHURISATION EFFICIENCY IN SILICON KILLED STEELS

Quality requirement of customers are becoming more stringent w.r.t low level of sulphur in final product for better mechanical property of steel. High sulphur in steel leads to poor internal quality in the form of cracks and sometimes causes break out during continuous casting of steel. In past, various studies have been carried out to investigate the desulphurisation process in steelmaking. But most of the work has been focused on desulphurisation of steel with high-basicity slag and in steels killed by aluminium. However, many steel grades which are silicon killed are having low slag basicity. Very few studies are available on desulphurisation of steels deoxidised with Si-Mn and having a low basicity slag comprising of system CaO–SiO₂–MgO–Al₂O_3.