Research on the inclusion during refining and continuous casting process of tire cord steel

The type,morphology and distribution of the inclusion in tire cord steel at each operation position ofLDLFVDCCproduction process were investigated.The result shows that it is bad for desulfurization to add refining slag during LD tapping,but it provides conditions for pre-slagging and inclusion modification in the following process.In order to gain a good plasticity of inclusion,neutral slag was used during refining process,it is forbidden to use bauxite at adjusting slag process,and the basicity of final slag was required at 0.9-1.1.Through analyzing the large inclusion,it can be found that most composition of inclusion is SiO2-Al2O3 and a small portion include Na2O and K2O.It should be involved refractories.Therefore,it is very important to use high quality refractories and control temperture of the molten steel and casting speed.