Improvement of the Initial Stage of Soli

The initial stage of solidification for continuous casting is crucial for optimizing the surface quality of steel, particularly hypo-peritectic steel, which faces challenges like longitudinal cracking due to shrinkage from the 8-y transformation. This study focuses on addressing the issues related to high-speed continuous casting, operating between 4-5 m/min, which is similarly affected by such cracking. The mold cross-section shape disadvantages round billet casters regarding longitudinal cracking. To enhance the surface quality of high-speed casting slabs and round billets, new mild cooling mold powders were developed. The results indicated that a mold powder with a high CaO/SiO2 ratio and high solidification temperature is optimal for slab casting, whereas a low CaO/SiO2 ratio mold powder with the same solidification temperature is ideal for round billet casting. Additionally, it was found that the radiation effect in the liquid powder film is more significant than that in the solid powder film. These findings could lead to improvements in the continuous casting process and the quality of steel products.