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为进一步降低GH4169中的硫含量,进行了大气下、氩气氛保护及氩气氛保护下向渣池加钙精炼3种工艺条件对脱硫效果影响的电渣重熔试验。结果表明,大气下重熔时脱硫效果明显,硫含量(质量分数,下同)由18×10-6降低到6×10-6,渣中的硫通过气化反应脱除;氩气氛保护不利于电渣重熔工艺的脱硫,硫含量降低到7×10-6后提高到9×10-6,熔渣中的硫不断富集;硫分配比的计算值与实测值的对比研究表明,电渣重熔脱硫热力学条件优越,动力学条件是限制实际脱硫效率进一步提高的主要因素;氩气氛保护下通过向渣池加钙后,熔渣中钙元素能够对合金进行脱硫且脱硫率有较大幅度的提升,合金中硫含量随钙含量的增加而减少,重熔结束时硫含量降至3×10-6。
In order to further reduce the sulfur content in GH4169, the electroslag remelting test was carried out under the protection of the atmosphere, the protection of argon atmosphere and the protection of argon atmosphere to the slag pool and the calcium refining process. The results show that the effect of desulfurization is obvious when the atmosphere is remelted, the sulfur content (mass fraction, the same below) is reduced from 18 × 10-6 to 6 × 10-6, the sulfur in the slag is removed by the gasification reaction, the argon atmosphere is not protected Which is conducive to the desulfurization of electroslag remelting process. When the sulfur content is reduced to 7 × 10-6, the sulfur content in the slag increases to 9 × 10-6, and the sulfur in the slag is continuously enriched. Comparing the calculated value of the sulfur distribution ratio with the measured value, Electroslag remelting desulfurization thermodynamic conditions are superior, the kinetic conditions is to limit the actual desulfurization efficiency to further improve the main factors; Argon atmosphere by adding calcium to the slag pool, slag calcium in the alloy desulfurization and desulfurization rate than The sulfur content in the alloy decreased with the increase of calcium content, and the sulfur content decreased to 3 × 10-6 at the end of remelting.