<p>The present study investigated the impact of applying an electric field during the initial stage of low-carbon steel continuous casting or the casting of high-carbon steel, focusing on the interface behavior between molten steel and the submerged entry nozzle under the external electric field. The results showed that carbon-containing substances continuously dissolved at the interface and entered the molten steel, altering the wettability. This led to enhanced adhesion and solidification of the molten steel on the inner wall of the submerged entry nozzle, which accelerated the formation of clogging. Applying an external electric field could control and enhance the interface contact, wetting, and reaction behavior between the submerged entry nozzle and molten steel during the continuous casting. The contact angle under negative electric fields was generally higher than that under positive electric fields, given the influence of different polarity conditions. By selecting appropriate electric field application parameters based on specific continuous casting conditions, the quality and production efficiency of steel materials can be effectively improved.</p>