The treatment method for the scratches on the surface of continuous casting slabs occurred on the wide foot roll or bending section of the crystallizer

Abstract

The invention provides a treatment method for the scratches on the surface of continuous casting slabs occurring on the wide-face foot roll or the bending section of the crystallizer, which includes the following steps: Step S1: Prepare new bending sections and mold spare parts, and wait for continuous casting Replacement when the machine stops production; step S2: reduce the casting speed, increase the cooling intensity, and carry out the stop operation of the drawing and leveling machine, insert the accumulated iron oxide scale into the slab shell and take it out of the continuous casting machine; step S3: use it in the tundish After the service life reaches the standard, the production of the continuous casting machine is stopped and the spare parts prepared in step S1 are used to replace the new horizontal section. When the oxide scale is accumulated on the wide-face foot roll and the bending section of the crystallizer by using the present invention, when the molten steel temperature is sufficient, the probability of taking the accumulated oxide scale out of the continuous casting machine is more than 90%.

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 that occur on wide-face foot rolls or bending sections of crystallizers. 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 shutdow...

AI Technical Summary

Problems solved by technology

[0005] The invention provides a treatment method for the scratches on the surface of the continuous casting slab that occur in the wide-faced foot roll or the bending section of the crystallizer, so as to solve the problem that once scratches and dents appear on the surface of the slab, it needs to be shut down for maintenance, which affects production and increases costs.