Method for treating scratches on surface of continuous casting slab

Abstract

The invention provides a method for treating scratches on the surface of a continuous casting slab. The method for treating the scratches on the surface of the continuous casting slab comprises the following steps that A, a stacking position of oxide scales is judged without shutdown, wherein the step that a stacking position of oxide scales is judged without shutdown comprises the step that according to the position and depth of the scratches on the surface of the slab, whether the oxide scales accumulate on a part, with lower strength, of the slab or a part, with higher strength, of the slab is preliminarily judged; and E, according to the stacking position of the oxide scales, the machine is not stopped, the pulling speed is reduced, the cooling strength is improved, stopping operation of a withdrawal and straightening machine is carried out, and the stacked oxide scales are embedded into a casting blank shell and then taken out of a continuous casting machine. By means of the method, the stacking position of the oxide scales can be accurately judged, and when the molten steel temperature is enough, the stacked oxide scales are taken out of the continuous casting machine online.

Description

technical field [0001] The invention relates to the field of metallurgy, in particular to the field of continuous casting, in particular to a method for treating scratches on the surface of continuous casting slabs. Background technique [0002] When the slab continuous casting machine is produced, the high-temperature molten steel passes through the crystallizer to form a continuous casting slab with a thin solid shell on the outside and a liquid inside. Due to the thinness of the solid shell, the surface of the solid shell is easy to be scratched or even dented or fractured during production. [0003] Once scratches and dents appear on the surface of the slab, in order to ensure the quality and production safety of the slab, the prior art must stop the production of the continuous casting machine, find the continuous casting roll with poor rotation and replace the corresponding equipment in the shutdown state. Such a treatment method is safe, but disrupts the production o...

AI Technical Summary

Problems solved by technology

[0005] The invention provides a treatment method for scratches on the surface of continuous casting slabs, in order to solve the problem that once scratches and dents appear on the surface of slabs, it is necessary to stop for maintenance to find continuous casting rolls with scale accumulation and poor rotation, and molten steel waiting for treatment caused by shutdown. temperature, return to the furnace, and the service life of the tundish is not up to the standard