Abstract
Laboratory and industrial experiments were carried out to investigate non-metallic inclusions in high strength alloy steel refined by using high basicity and high Al2O3 content slag. It was found that the steel/slag reaction time largely affected non-metallic inclusions in steel. With the reaction time increased from 30 to 90 min in laboratory study, MgO-Al2O3 spinels were gradually changed into CaO-MgO-Al2O3 system inclusions surrounded by a softer CaO-Al2O3 outer layer. By using high basicity slag which contained as much as 41 mass% Al2O3 in the laboratory study, the fraction of low melting temperature CaO-MgO-Al2O3 system inclusions were remarkably increased to above 80%. In the industrial experiment, during the secondary refining, the inclusions changed in the order of Al2O3 → MgO-Al2O3 → CaO-MgO-Al2O3. Through the LF and RH refining, most inclusions can be transferred to CaO-Al2O3 and CaO-MgO-Al2O3 system inclusions of lower melting temperature.
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