Method for controlling the center defect of ultra-wide slab

Abstract

The invention discloses a method for controlling the center defect of an ultra-wide slab, and relates to the technical field of continuous casting blank processing. A continuous casting machine is involved, and comprises eight cooling sections positioned behind a crystallizer, and the method comprises the following steps that an electromagnetic stirring device used for generating spiral rotating force and stirring molten steel is arranged at a second cooling section, the electromagnetic stirring device comprises a first electromagnetic stirring roller set and a second stirring electromagneticroller set, the first stirring electromagnetic roller set is located at the second section of the second cooling section, the second stirring electromagnetic roller set is located at the third sectionof the second cooling section. According to the method, the electric magnetic force can be used for driving a steel liquid perpendicular to columnar crystal to flow so as to enable the temperature ofthe solidified front edge to be uniform, impurities and bubbles in the solidified front edge can be promoted to move, most importantly, columnar dendritic crystal is broken or bent, the solute accumulates in the solidified front edge is uniformly distributed in a solution body, after the dendritic crystal fragments enter the solution body to form a new crystallization core, the quantity of isometric crystal is increased, so that the quality of the continuous casting blank can be improved.

Description

technical field [0001] The invention relates to the technical field of continuous casting slab processing, in particular to a method for controlling defects in the center of an ultra-wide slab. Background technique [0002] During the casting process of ultra-wide slabs, due to the wide section of the casting machine, it is difficult to uniformly cool the slabs in the secondary cooling zone, resulting in inconsistent solidification end points of the slabs, poor effect of light reduction process, and easy formation of center segregation, center looseness, and shrinkage cavities and V-shaped segregation and other internal defects, thereby reducing the ductility, hydrogen-induced crack resistance and welding performance of the steel, or causing safety accidents due to internal quality problems of the steel. Contents of the invention [0003] The technical problem to be solved by the present invention is that in the casting process of super-wide slabs, due to the wide section ...

AI Technical Summary

Problems solved by technology

[0002] During the casting process of ultra-wide slabs, due to the wide section of the casting machine, it is difficult to uniformly cool the slabs in the secondary cooling zone, resulting in inconsistent solidification end points of the slabs, poor effect of light reduction process, and easy formation of center segregation, center looseness, and shrinkage cavities internal defects such as V-shaped segregation, etc., thereby reducing the ductility, hydrogen-induced crack resistance and welding performance of the steel, or causing safety accidents due to internal quality problems of the steel.