<p>The current study aims to reveal the evolution and precipitation behaviors of non-metallic inclusions during protective atmosphere electroslag remelting of 15Cr–30Ni heat-resistant alloy. A mathematical model for calculating the adsorption behavior of inclusions by molten slag was established. The maximum proportions of MgO·Al₂O₃ and Al₂O₃ inclusions in the consumable electrode adsorbed by molten slag during electroslag remelting are 6 and 8&#xa0;pct, respectively. The residual Al₂O₃ inclusions from the consumable electrode are completely dissociated before passing through the slag pool into the liquid metal pool. Most of the MgO·Al₂O₃ inclusions in the remelted ingot are newly formed, and a minor fraction is originated from the consumable electrode. TiN inclusions in the consumable electrode are completely dissociated before passing through the slag pool into the liquid metal pool. The inclusions in the remelted ingot are single-phased TiN and MgO·Al₂O₃–TiN complex inclusions. TiN observed in the remelted ingot was newly formed in the low-temperature zone of the liquid metal pool and during liquid alloy solidification. The Al₂O₃-rich spinel is the main type of spinels in the consumable electrode, and most of the MgO-rich spinels present in the remelted ingot are newly formed. The grain boundary mobility of MgO-rich spinel solid solution is much higher than that of Al₂O₃-rich spinel, which leads to the increase in interface energy of TiN precipitation around MgO-rich spinel and the suppression of TiN inclusion precipitation. A model was established to predict the size of TiN inclusions. The proposed strategy for regulating the TiN inclusions wrapped around MgO·Al₂O₃ inclusions through adjusting the chemistries of MgO·Al₂O₃ inclusions provides a new insight for controlling TiN precipitation in high-titanium alloys.</p>