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 55CaF

2

-25Al

2

O

3

- 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.