Experimental investigation and kinetics model ware carried out to study the effect of the atmosphere on the desulfurization of low-sulfur plastic die steel during the electroslag remelting process. 55Cr17Mo1VN plastic die steel was applied as the electrode and remelted with two different kinds of atmospheres using a laboratory-scale ESR furnace. It was found that the sulfur content of 50 ppm in the electrode decreased to 8–12 ppm in the air atmosphere, while reduced to 9–14 ppm in a protective atmosphere. The desulfurization rates were 82% and 78%, respectively. Correspondingly, the sulfur content of 0.12% in initial slag increased to 0.125% and 0.15%. The coupled desulfurization kinetics model was established, the oxygen activity (a _(O)) and sulfur distribution coefficient (L _(s)) are taken into consideration, and they change with the remelting time during the calculation. The results show that the calculated values are in good agreement with the experimental values. The desulfurization effect at the electrode tip is significantly better than the positions where the droplet passes through the slag layer and the slag pool/molten pool interface. The L _(s) and comprehensive mass transfer coefficient of sulfur (k _(S)~(*)) decrease with the remelting time, while the a _(O) at each reaction position increases. Compared with the protective atmosphere, L _(s) and k _(S)~(*) have larger values during the air atmosphere ESR process, but the a _(O) value is equal. Under the different atmospheres, the most types of inclusions in the steel are MnS, and the refining atmosphere has no significant effect on the types of inclusions.
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机译：实验研究和动力学模型贮存研究了大气对电袋重熔过程中低硫塑料模钢脱硫效果的研究。使用实验室级ESR炉用55CR17MO1VN塑料模钢作为电极施加并用两种不同种类的大气进行再熔断。发现电极中50ppm的硫含量在空气气氛中降低至8-12ppm，同时在保护气氛中降至9-14ppm。脱硫率分别为82％和78％。相应地，初始熔渣中的硫含量为0.12％，增加到0.125％和0.15％。建立了偶联的脱硫动力学模型，考虑了氧活性（ _（o））和硫分布系数（ l _（s）），并且在计算期间随着refelting时间改变。结果表明，计算值与实验值吻合良好。电极尖端的脱硫效果明显优于液滴通过渣层和炉渣池/熔池界面的位置更好。硫（ k _（s）〜（*））和剩余传质系数随refelting时间而降低，而每个反应位置的 a _（o）增加。与保护气氛相比， L _（s）和 k _（s）〜（*）在空气气氛ESR过程中具有较大的值，但 a _（o）值相等。在不同的环境下，钢中最多类型的夹杂物是MNS，细化气氛对夹杂物的类型没有显着影响。
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