Abstract
AbstractA laboratory study was carried out to investigate non‐metallic inclusions in high strength alloying steel refined by high basicity slag. The results indicated that the inclusions were mainly of the CaOMgOAl2O3 system, Al2O3MgO and MgO‐based inclusions. The steel/slag reaction time and Al2O3 content in slag had a great effect on inclusions characteristics. With the reaction time increasing from 30 to 180 minutes, inclusions experienced a transformation process: from mainly Al2O3MgO system and MgO‐based inclusions to spherical CaOMgOAl2O3 system inclusions surrounded by a lower melting temperature surface layer of CaOAl2O3. Formation and transformation mechanisms of the inclusions were given based on the results. It was also found that with Al2O3 content in slag reduced from 40% to 30%, [Mg] contents in steel melts were increased and MgO in slag reached saturation, which contributed to the formation of more MgO‐based inclusions and a more scattered inclusion composition distribution after 90 min reaction.
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