Dynamic interaction between refractory and low‐carbon low‐silicon Al‐killed steel

Abstract To investigate the dynamic interaction between refining refractory and low‐carbon low‐silicon Al‐killed steel, the “refractory‐molten steel‐inclusion” system was analyzed using dynamic erosion experiments and the FactSage database. This study discussed the formation of interfacial layers between various refining refractories and molten steel, as well as the transformation of nonmetallic inclusions in steel. The findings indicate that the interaction between refractories and molten steel produces a distinct interface layer. The influence of various refining refractories on inclusions varies significantly. MgO‐C refractory promotes the formation of MgO·Al 2 O 3 inclusions in steel, while Al 2 O 3 ‐MgO refractory leads to the formation of SiO 2 ‐MnO‐Al 2 O 3 inclusions. Both Al 2 O 3 ‐SiC refractory and Al 2 O 3 ‐MgO‐C refractory result in Al 2 O 3 inclusions with trace levels of MgO. Steel refined with Al 2 O 3 ‐MgO‐C refractory has increased MgO content within Al 2 O 3 inclusions but still does not reach the stoichiometric ratio of MgO·Al 2 O 3 . As the initial Al content increases, the influence of MgO‐C refractory inclusions becomes increasingly noticeable. The average MgO content within the inclusions rises with the reaction duration, achieving as high as 62.9%. The transition path of Al 2 O 3 inclusions in molten steel follows “Al 2 O 3 →MgO·Al 2 O 3 →MgO.”