Investigating the reaction mechanism between slag and 9CrMoCoB steel is important to develop the proper slag and produce qualified ingots in the electroslag remelting (ESR) process. Equilibrium reaction experiments between molten 9CrMoCoB steel and the slags of 55wt%CaF₂-20wt%CaO-3wt%MgO-22wt%Al₂O₃-xwt%B₂O₃ (x = 0.0, 0.5, 1.0, 1.5, 2.0, 3.0) were conducted. The reaction mechanisms between molten 9CrMoCoB steel and the slags with different B₂O₃ contents were deduced based on the composition of the steel and slag samples at different reaction times. Results show that B content in the steel can be controlled within the target range when the B₂O₃ content is 0.5wt% and the FeO content ranges from 0.18wt% to 0.22wt% in the slag. When the B₂O₃ content is ≥1wt%, the reaction between Si and B₂O₃ leads to the increase of the B content of steel. The additions of SiO₂ and B₂O₃ to the slag should accord to the mass ratio of [B]/[Si] in the electrode, and SiO₂ addition inhibits the reaction between Si and Al₂O₃.

研究炉渣与9CrMoCoB钢之间的反应机理对于在电炉渣重熔（ESR）过程中开发出合适的炉渣并生产合格的铸锭至关重要。9CrMoCoB熔融钢与55wt％CaF ₂ -20wt％CaO-3wt％MgO-22wt％Al ₂ O ₃ - x wt％B ₂ O ₃（x = 0.0、0.5、1.0、1.5、2.0的炉渣）之间的平衡反应实验（3.0）。9CrMoCoB钢水与不同B ₂ O ₃矿渣之间的反应机理根据钢和矿渣样品在不同反应时间下的成分推导其含量。结果表明，当炉渣中B ₂ O ₃含量为0.5wt％，FeO含量为0.18wt％至0.22wt％时，可以将钢中的B含量控制在目标范围内。当B ₂ O ₃含量≥1wt％时，Si与B ₂ O ₃之间的反应导致钢中B含量的增加。在炉渣中添加SiO ₂和B ₂ O ₃应当符合电极中[B] / [Si]的质量比，而SiO _2的添加会抑制Si和Al ₂之间的反应O ₃。