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Vacuum Treatment of Metal in the Process of Continuous Casting

One of the promising areas of liquid steel processing is the development of metal vacuum treatment in the stream during continuous casting (flow vacuum treatment). Several technological schemes of such processes have been developed, however, in practice, the only variant of the process has been implemented at the conditions of converter shop No-2 of Novo-Lipetzk Metallurgical Combine (NLMC) (Figure 1). The technology of flow vacuuming is based on the theoretical works of Professor G A Sokolov [1]. A steel ladle with a special jointing element covering the slide valve is installed on the supports of the CCM, then the hydraulic cylinder is attached to slide valve and the compressed air is given to assembling device.Then the slide valve is opened and vacuum chamber with the help of hydrocylinders is lifted to connecting with the ladle, while the metal fills the bottom of the vacuum chamber and flows through the pouring pipe into the intermediate tundish, stopper of the tundish is raised to ensure a minimum distance between the end of the (submersible pouring pipe) and the tundish bottom. The technological process is based on the vacuum degassing of the jet and the metal layer in the vacuum chamber located between the steel ladle and the tundish of Continuous Casting Machine (CCM). Refined steel enters the intermediate bucket on a tube submerged to the level of metal. During vacuum treatment, the difference in metal levels in the tundish and in the chamber is balanced by external pressure and forms barometric height.