The continuous steel casting (CSC) technology has resulted in an increase in steelworks productivity and made it possible to cast billets of a favourable internal structure. Developing and improving the CSC technology for alloy addition feeding to liquid steel for increasing the purity level or correcting of chemical composition grade seems to be quite an interesting approach for advanced steelmaking process. In the tundish, the chemical homogenisation process is controlled by the feed stream and flow control devices. This paper presents the results of investigation describing the process of liquid steel chemical homogenisation in the six strand billets tundish with stopper rod system. The alloy was fed to liquid steel by pulse-step method. Computer simulations of liquid steel flow and alloy addition mixing were performed using the commercial program Ansys-Fluent. Four tundish variants without and with flow control devices were considered. Additionally computer simulations for four different alloy feeding positions and two type of alloys in the form of nickel and aluminium were performed. Information about the dynamics of steel alloying process was obtained on the basis of fields of liquid steel flow and alloy addition distribution characteristics. For all simulations cases the mixing time was calculated.Keywords: Continuous casting, tundish, liquid steel, alloying, numerical modelling
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