Influence of slag basicity on the cleanness of molten steel with VD vacuum treatment
The influence of slag basicity on the cleanness of molten steel with VD treatment was investigated with industrial trials,and the key control process for high purity was obtained.The results showed that using a lower slag basicity between 1.8 and 2.5,the slag had a higher oxidability.During the VD treatment process,the reaction between molten steel Al and oxides in slag was intense,and the control of oxygen content and inclusion size in the steel was poor.Using high basicity slag between 7.0 and 10.0,the ultra-low oxygen content could be obtained in the steel,but the occurrence rate of large-sized CaO-MgO-Al2O3 and CaO-Al2O3 inclusions in steel was still high.Using the slag basicity between 3.0 and 5.0,a lower oxygen content and smaller size inclusions were obtained in the steel,and the inclusions were mainly consisted of MgO-Al2O3.
slag basicityreaction between molten steel and slaginclusions compositionoxygen content
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