Effect of Refining Slag on Inclusions in Non-Aluminum Deoxidation Steel

The experiments were carried out by MoSi_2 furnace in MgO crucible.The experimented steel was heavy rail steel and Si-Ca-Ba alloy was used as the deoxidizer.The results show that the total oxygen content of steel,and the total quantity,total area and average radius of inclusions decrease with the increasing of basicity(R) of refining slag.The total quantity and total area of inclusions are least when Al_2O_3 content in refining slag from 13% to 20%,while the proportion of small inclusions increases when more than 20% Al_2O_3 content.The contents of SiO_2 and Al_2O_3 in inclusions are affected directly by the SiO_2 and Al_2O_3 content in refining slag,especially in slag with CaO·Al_2O_3·2SiO_2.Therefore,it's feasible to control the composition of inclusion in non-aluminum deoxidation steel by controlling the composition of refining slag.