Influence of the Design of Metal Receivers of Slab Continuous-Casting Machines on the Motion of Flow in the Tundish in t
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Vol. 61, No. 1, May, 2020
REFRACTORIES IN HEATING UNITS INFLUENCE OF THE DESIGN OF METAL RECEIVERS OF SLAB CONTINUOUS-CASTING MACHINES ON THE MOTION OF FLOW IN THE TUNDISH IN THE CASE OF DEVIATIONS OF THE METAL STREAM FROM THE REQUIRED POSITION. PART III. RESULTS OF INVESTIGATIONS1 S. V. Sukharev,2,5 A. V. Zabolotskii,3 P. V. Kotrovskii,4 and M. Yu. Turchin4 Translated from Novye Ogneupory, No. 1, pp. 5 – 8, January, 2020.
Original article submitted September 4, 2019. We study the problem of evaluation of the influence of design of the metal receiver of a large-capacity tundish of slab continuous-casting machine on the decrease in the turbulence of flows in the case of deviation of the metal stream from the required position in the process of casting. We present the results of computer simulations of various types of deviations from the target point of input for the metal stream flowing from the steel-teeming ladle into the tundish. We perform the comparison of the distributions of metal flows in tundishes with metal receivers of different designs. We also give recommendations concerning the possibilities of weakening of the turbulence of flows in the analyzed cases. Keywords: continuous-casting machines, tundish, metal receiver, turbulence, protective pipe, displacements of the metal stream.
However, the metal receiver is the first object in the structure of tundish in the way of the falling jet of liquid steel, which strongly affects the seriality of the process of continuous casting. After filling of the tundish with a melt up to the working level and the transition of the stream formed by the submersible pipe into the submerged mode, the sizes of the metal receiver and the volume of the melt located directly over the receiver determine, in fact, the boundaries of the so-called “receiving” zone of the tundish. It is extremely important to be able to maximally decrease the level of turbulence in the falling metal stream just in the receiving zone of the tundish. This would ensure the possibility of subsequent motion of the flow in the volume of the tundish up to the steel-tapping holes for the time sufficient for the removal (surfacing and assimilation by the slag) of nonmetallic inclusions (NI). This time is determined by the following two parameters: the velocity of motion of the flow and its trajectory. In our opinion, in this case (including the case of blasting), the indicated partitions and thresholds are useful objects but play a secondary role in the process of control over steel
In the present work, the procedure of simulation of flows of liquid steel was carried out for the case of a tundish containing solely the metal receiver. In the literature, there are numerous works devoted to the (physical and/or mathematical) simulations performed for the case where the tundish contains additional objects affecting the character of motion of the metal flows in its volume, e.g., partitions of various types, including partitions with holes for the flows through them, small blasting thresholds, and various thei
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