The current paper focuses on the influence of initial large-sized inclusion content in the consumable electrode on inclusion removal during electroslag remelting (ESR) of H13 die steel. Considering the relationship between the inclusion size and the interfacial energy change of the slag/inclusion/steel system during the inclusion transfer across the steel/slag interface, the thermodynamic conditions for inclusion removal from steel to the slag were put forward. The results showed that the content of large-sized inclusions in final ESR ingot was decreased by approximately 13.66% with the increase in large-sized inclusion content in the consumable electrode from 11.36 mg/10 kg to 16.50 mg/10 kg. The interfacial energy change of the slag/inclusion/steel system decreases with the increase in inclusion radius during the absorption process of inclusions by slag, which is beneficial for inclusion removal.
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