Abstract: In accordance with the current in electroslag remelting(ESR)GCr15 bearing steel D inclusions exceeding the standard problem,the different slag systems are designed,and respectively with the help of Factsage software and empirical formulae to calculate the melting characteristics of the slag system,viscosity,electrical conductivity and other physical parameters,using laboratory slag metal balance experiments and field 2.5 t electroslag remelting experiments,the results show that, the optimal ESR slag system is 55CaF₂-25Al₂O₃- 15CaO-5MgO.With use of the optimal slag system the average total oxygen content in steel is 41.98% lower than that with the traditional slag system,and can reduce the change in the total oxygen content of steel in different locations of electroslag ingot; as compared to the original slag system the number of 1-5  μm inclusions  decreases by 31.25%.Through the slag system on inclusions control,it can improve class D inclusion in GCr15 bearing steel,rating level reaches 0.5,and can better“clean”electric slag ingot.

Key words: Bearing Steel, GCr15, ESR, Slag, Cleanness

摘要： 针对目前在电渣重熔(ESR)GCr15轴承钢D类夹杂物超标问题，设计不同渣系，并分别借助Factsage软件和经验公式计算了渣系的熔化特性、黏度、电导率等物性参数，采用实验室渣金平衡实验及现场2.5 t电渣重熔实验分析得出：最优ESR渣系为55CaF₂-25Al₂O₃-15CaO-5MgO。使用新渣系平均全氧含量较传统渣系降低41.98%,并且能够降低电渣锭不同位置的全氧含量；对于1～5μm夹杂物个数较原始渣系下降了31.25%。通过渣系对夹杂物调控，改善了GCr15轴承钢中D类夹杂物，评级级别可达到0.5级，能够更好地“净化”电渣锭。

关键词: 轴承钢；GCr15, 电渣重熔；渣系；洁净度