Investigation of the Influence of the Inner Diameter and the Depth of Placement of the Sen in the Mold of Radial Billet CCM

Processy litʹâ, 2020, Tom 140, №2, p.15-21

Abstract

Received 22.04.2020

UDC 621.74.047

Problems of optimization of casting parameters during casting of high quality varietal billet in a continuous way were studied. The influence of the inner diameter and the depth of the SEN in the mold of the radial CCM have been carried out. The basis of the  research was the construction of a flowing SEN in the conditions of operation of the mold of CCM PJSC "Dnipro Metallurgical Plant", depth of placement of the SEN in the range from 60 to 180 mm in 20 mm increments, and diameters of the SEN cavity 28, 32, 36 mm. As a result of researches it is established that the use of SEN with an inner diameter of 28 mm is possible if its immersion depth is in the range of 80 to 100 mm. Variation of the depth of the recess in this limit does not significantly change the nature of the flow distribution. The jet has a clearly formed directional character and is at a sufficient distance from the walls of the mold. The use of SEN with an internal diameter of 36 mm is complicated by the fact that the jet at all depths of submergence of the beaker is unformed and pressed to a greater radius. As a result, it is possible to flush out the hardened crust of the metal and there is a likelihood of breakouts. However, one glass immersion depth was found, 100 mm, which satisfies the requirements necessary to obtain a high-quality billet. The convective flow coming out of the SEN penetrates into the liquid phase by an acceptable value, and the velocities under the metal mirror do not create conditions for the development of wave- and vortex-forming. The use of the SEN with an internal diameter of 32 mm is most justified. When used it is possible to change the depth in the widest range from 80 to 120 mm, which will not significantly change the ratio of distribution of turbulent flows. The jet is integral and is at a safe distance from the walls of the mold, the kinetic energy of the jet manages to dissipate to the horizon of crystallization without creating prerequisites for washing the crust of the metal along the axis of the mold, and velocities in the meniscus zone are within acceptable limits.