Method and device for preventing thin-strip continuous casting molten bath surface from contaminating

Abstract

The invention provides a method and a device for preventing a thin-strip continuous casting molten bath surface from contaminating. The method comprises the following steps of arranging molten bath liquid level detecting devices on the both ends of a molten bath, respectively observing the situations of floating slag on a molten bath surface of a driving side and a driven side of a casting roller and liquid height of the molten bath, if the distance between the floating slag edge of the molten bath surface and the junction line of molten steel and the rolling surface of the casting roller surface is monitored less than 25 mm, removing the floating slag from the molten bath surface through a floating slag removing device, thereby keeping cleaness of a thin-strip continuous casting molten bath, avoiding the floating slag to be drawn in a solidified steel billet shell, and improving the quality of a cast strip. With the adoption of the method and device provided by the invention, the molten steel on the molten bath surface can be avoided to be solidified; the cleanness situation of the surface of the thin-strip continuous casting molten bath can be observed, so that after the floating slag is accumulated to a certain extent, the floating slag can be removed through the floating slag removing device, thereby keeping the thin-strip continuous casting molten bath tidy, avoiding the floating slag to be drawn in the solidified steel billet shell and improving the quality of the cast strip.

Description

technical field [0001] The invention relates to a continuous casting process, in particular to a method and a device for preventing surface pollution of a thin strip continuous casting molten pool. Background technique [0002] Twin-roll strip continuous casting technology is an advanced short-flow metallurgical process, that is, the molten steel is directly poured into a molten pool surrounded by two relatively rotating casting rolls with rapid cooling function and side sealing plates. The molten steel is cooled and solidified on the rotating circumferential surface of the casting roll, and then forms a solidified shell and grows gradually, and then is squeezed together at the smallest gap between the two crystallization rolls to form a strip. The roll surface cleaning device on the outside of the casting roll Real-time cleaning of oxide impurities on the roll surface. [0003] In the production process of strip continuous casting, if there is metal or non-metal oxide dros...

AI Technical Summary

Problems solved by technology

[0006] There are other methods mentioned in several other patents to control the surface cleanliness of the molten pool. The main starting point is to control the generation of scum and control the temperature of the surface of the molten pool to prevent the solidification of molten steel on the surface. However, if scum is generated on the surface of the molten pool, It is best to use the method of thorough removal, otherwise the scum accumulates too much and it is difficult to control it from being involved in the casting belt on the surface of the narrow molten pool

The solidification of molten steel on the surface of the molten pool should be avoided in the early stage of casting, otherwise the risk of casting interruption zone will easily occur

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