Through process simulation with thermodynamic soft ware and static slag corrosion resistance experiment,the corrosion resistance behavior of RH inserted tube magnesia-chrome brick against common steel slag and silicon steel slag in a steel plant were studied.The results show that the corrosion of common steel slag on magnesia-chrome brick is small,but the penetration is serious,and the silicon steel slag has serious corrosion on magnesia-chrome brick.Therefore,it is suggested that steel plants can refine ordinary steel first and then silicon steel when refining with the same RH inserted tube,which is beneficial to prolong the service life of RH inserted tube.