Research On The Source And Removal Of Slag On The Surface Of Non-Oriented Silicon Steel

Non-oriented silicon steel is a kind of magnetic alloy material,in its continuous casting production process,the surface of the casting billet will cause the surface quality defect due to improper production process parameters.Therefore,optimize the operation process parameters is of great significance to improve the quality of non-oriented silicon steel products.This topic is based on the surface defects of slab in the production process of non-oriented silicon steel.Firstly,the types and sources of inclusions were analyzed by large-scale electrolysis and microinclusion detection methods.It was found that more than 60% of the inclusions contained K and Na elements,so it can be judged that the surface slag inclusion was mainly caused by mold slag entrapment.In order to control the defects,the three-dimensional mold of the slab continuous casting mold was established by fluent,and the characteristics of the molten steel flow field in the slab continuous casting mold under different operating parameters were studied in depth in combination with the LES+VOF coupling algorithm,and the research results showed that under the existing operating parameters,three kinds of slag entrapment behavior occurred in the mold,whirlpool slag,shear slag and liquid surface fluctuation slag.The influence of different operating parameters on the flow field characteristics of the mold is studied based on the degree of fluctuation of the liquid level of the steel slag.It is found that speed has the greatest impact on the fluctuation behavior of the steel slag entrapment in the mold.The increase in the size of the casting mold section has less impact on the slag entrapment phenomenon.With the immersion depth remaining constant,the casting speed be controlled from 1.1 m/min to 1.2 m/min as the cross-sectional size increases from 950 mm ×230 mm to 1300 mm ×230 mm.When the speed is increased to a maximum speed of 1.2 m/min,the optimal immersion depth is 130 mm.When the inlet inclination angle is increased from the original 15° to 25°,the casting speed under the corresponding section can be increased to up to 1.4 m/min.Based on the above research,the F index model of liquid level fluctuation under corresponding parameters is established,and the critical slag F number is calculated under the corresponding working conditions,and the F index model is used to predict the liquid surface slag behavior of the mold under different parameters,which provides theoretical guidance for the actual production.Figure 58;Table 24;Reference 67...