针对 贝 氏 体 辙 叉 钢 成 分 及 液 相 线 温 度 特 点 ， 以低 共 晶 点 原 则 ， 借 助 FactSage 7.3 热力 学 软件 计 算CaF2-Al2O3-CaO-MgO 渣系 相 图 以 及 熔 点 、黏度 、电导 率 等 物 性 参 数 ，进而 优 选 出 新 型 贝 氏 体 辙 叉 钢 专 用 渣 系 。 利用实验室 10 kg 级电渣重熔炉对比研究了传统二元渣系70%CaF2-30%Al2O3(1#)(质量分数)和设计渣系 47.5%CaF2-21.5%Al2O3-28%CaO-3%MgO(2#，质量分数)电渣重熔冶炼贝氏体辙叉钢成分和低倍组织等冶金质量的差异。 结果表明，相比于传统二元渣系，利用设计渣系电渣重熔冶炼的贝氏体辙叉钢脱硫率更高，可达到 90.91%，但钢中硅存在一定程度的烧损且电渣重熔增氢幅度更大。 经两种渣系冶炼的电渣锭低倍组织均较为良好，设计渣系重熔电渣锭表面质量更优。

On the basis of the composition and liquidus temperature characteristics of bainitic frog steel, the phase diagram of the CaF2-Al2O3-CaO-MgO slag system, as well as physical parameters such as the melting point, viscosity, and conductivity, was calculated via FactSage 7.3 thermodynamic software. Furthermore, a new specialized slag system for bainitic frog steel was optimized. The differences in the metallurgical quality, composition, and microstructure of bainitic frog steel during electroslag remelting between the traditional binary slag system containing 70 wt.% CaF2-30 wt.% Al2O3 (slag 1#) and the designed slag system containing 47.5 wt.% CaF2-21.5 wt.% Al2O3-28 wt.% CaO-3 wt.% MgO (slag 2#) were investigated in a 10 kg electroslag remelting furnace. Compared with that of the traditional binary slag system, the desulfurization rate of bainite frog steel smelted by designing slag-based electroslag remelting is greater, reaching 90.91%. However, there is a certain degree of burning loss of silicon in steel, and the increase in hydrogen content is greater during electroslag remelting by slag 2#. The microstructure of the electroslag ingots smelted by the two slag systems is relatively good. The designing slag based remelting electric slag ingot has better surface quality.