2022 Volume 62 Issue 8 Pages 1649-1656
With the improvement of the requirements for lightweight automobiles, the research and development of a higher Al content of TRIP steel have received extensive attention. However, Al in molten steel is easy to react with SiO2 in mold slag, which is one of the restrictive factors of high Al-TRIP steel continuous casting quality control. Applying the double-film mass transfer theory, combined with the slag-steel reaction equilibrium test, a dynamic equilibrium model is established, and the crystalline phases composition before and after the reaction is analyzed. The results show that the melting process of mold flux samples A and B is uniform and meets the continuous casting control temperature. The main components of the two mold flux samples changed rapidly within 10 minutes of the initial reaction. When the reaction progressed to 20 minutes, the composition of the two mold flux samples had no obvious change trend, and the slag-steel reaction reached equilibrium. The main precipitated crystalline phases of the mold flux sample are LiAlO2, Ca3(BO3)2, NaAlO2, ZrO2, and CaZrO3 crystals. Mold slag A identified the mass transfer of Al in the steel as the limiting part of the reaction, while mold slag B identified the mass transfer of SiO2 in the slag as the limiting part of the reaction.
