Abstract: The electroslag-remelting (ESR) test on steel Cr13Mn4Mo by 70CaF₂-30Al₂O₃ slag series has been carried out. The total oxygen content, sulfur content and amount, size and morphology of inclusions in Ф55mm electrode and Ф120mm (36kg) ESR ingot are analyzed and measured by SEM/EDS, oxygen-nitrogen determinator and carbon-sulfur analyzer, and the thermodynamic analysis on MnS inclusions precipitation process in steel is carried out. Results show that by ESR the total oxygen content in steel decreases from 0.0121% to 0.0044%, sulfur content in steel decreases from 0.010% to 0.002% , as compared with electrode the number per mm² of inclusions in ESR ingot decreases from 855 to 257 and the size of inclusions in ESR ingot decreases obviously which are about 1μm Al₂O₃ and compound inclusions with Al₂O₃ core surrounded by MnS at outside. Thermodynamic calculated results show that in test conditions there is no single MnS formation that agrees with SEM/EDS analysis results.

摘要： 采用70CaF₂-30Al₂O₃渣系对Cr13Mn4Mo钢进行电渣重熔试验。利用SEM/EDS、氧氮分析仪和碳硫分析仪分析和检测了Ф55mm电极及Ф120mm（36kg）电渣锭中全氧含量、硫含量及夹杂物的数量、尺寸和形貌,钢中MnS夹杂的析出过程进行了热力学分析。结果表明,电渣重熔后钢中全氧含量由0.0121%降低至0.0044%,硫含量由0.010%降低至0.002%,和电极相比,电渣锭中夹杂物数密度由855个/mm²降低至257个/mm²,钢中夹杂物的尺寸明显减小,为1μm左右Al₂O₃夹杂,以及以Al₂O₃为核心,外层附着MnS的复合夹杂。热力学计算表明,在实验条件下没有单个的MnS生成,这与SEM/EDS分析结果吻合。

关键词: 电渣重熔, Cr13Mn4Mo不锈钢, 夹杂物演变, MnS, 二次枝晶臂