Abstract: In order to mitigate fracture and abnormal erosion of stopper rods in continuous casting tundishes and thereby enhance production safety and stability, a comparative analysis was conducted on two commonly used slab tundish stopper rods. The study examined their internal structure, chemical composition, phase constitution, and physical properties at both room and high temperatures. The results indicate that the HN-1 stopper rod, featuring a phosphate-bonded corundum-mullite anti-adhesion coating, a tightly adherent anti-oxidation coating, and a MgAl₂O₄-C head material, demonstrates excellent oxidation and erosion resistance. However, its slag line, composed of a low-ZrO₂ Al₂O₃-C material, exhibits reduced erosion resistance, leading to fracture during operation. In contrast, the HY-1 stopper rod employs an Al₂O₃-C/MgO-C composite structure in its slag line, providing superior erosion resistance. Nevertheless, the composition design of its anti-oxidation coating and the inadequate oxidation resistance of the rod body result in uniform internal oxidation of the stopper rod. Through optimization of the slag line material for the HN-1 rod and adjustments to the glaze composition and matrix oxidation resistance for the HY-1 rod, the sequence length for continuous casting of low-carbon steel was increased from 22 heats to 27-32 heats. These improvements effectively ensured the safety and stability of the continuous casting process.