<p>Utilizing a higher reduction ratio in the production of heavy plates not only facilitates the healing of internal shrinkage voids, porosity, and other defects in continuous casting slabs but also effectively refines the grain structure, enhancing the overall material performance. However, the higher reduction ratio imposes limitations on the product’s thickness. Applying heavy reduction at the end of solidification effectively heals internal shrinkage and porosity, while promoting solute redistribution and suppressing segregation. However, the effects on the microstructure and performance of subsequently rolled materials have not been systematically investigated. This study focuses on the continuous casting slabs, investigating the effects of heavy reduction process applied at the solidification endpoint on shrinkage, porosity, and segregation. Additionally, it explores how different heavy reduction regimes influence the microstructure and properties of subsequent rolled materials under varying reduction ratios. The findings reveal that the application of a heavy reduction process significantly mitigates shrinkage and porosity defects in the center area of slab while also reducing segregation.</p>