Heavy reduction sector section used for overcoming plate blank looseness and shrinkage defects and application method thereof

Abstract

The invention relates to the field of accessory equipment used for conducting posttreatment or postprocessing on cast blanks on site during metal continuous casting, in particular to a heavy reduction sector section used for overcoming the plate blank looseness and shrinkage defects and an application method thereof. The heavy reduction sector section used for overcoming the plate blank looseness and shrinkage defects comprises an upper frame (11) and a lower frame (12) and is characterized by further comprising a pair of big loose rolls (21), a pair of driving rolls (22), at least three pairs of small loose rolls (23), big loose roll reduction oil cylinders (31), horizontal oil cylinders (32), a driving roll reduction oil cylinder (33) and a water pipe (4). The application method of the heavy reduction sector section used for overcoming the plate blank looseness and shrinkage defects is characterized in that the method is implemented in the following steps that a casting blank is pulled into the sector section; extrusion is conducted, specifically, the rolling reduction no less than 10 mm is applied to the casting blank; and the casting blank is pulled out of the sector section. According to the heavy reduction sector section used for overcoming the plate blank looseness and shrinkage defects and the application method thereof, the quality of the casting blank is high, and the looseness and shrinkage defects barely occur.

Description

technical field [0001] The invention relates to the field of auxiliary equipment used for post-processing or post-processing casting blanks on site during continuous metal casting, in particular to a heavy-pressed lower segment for improving loose and shrinkage defects of slabs and a method for using the same. Background technique [0002] Wide and thick continuous casting slabs generally have the problems of internal center segregation, center porosity and shrinkage cavity, which cause quality defects of casting slabs and seriously affect the mechanical properties of steel. Practice has proved that the dynamic soft reduction technology can effectively solve the problem of central segregation inside the slab, but it has little effect on the problems of porosity and shrinkage inside the slab. In order to solve the problems of porosity and shrinkage cavity inside the slab, the current common practice is to increase the compression ratio during the rolling process of the slab, ...

AI Technical Summary

Problems solved by technology

However, due to the limitation of the structural type, the various sectors of the slab continuous casting machine cannot satisfy the reduction of more than 10mm for a single sector to cast the slab.

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