Final-pouring capping method for reducing abrasion of copper plate of crystallizer of moderate-thickness slab caster

Abstract

The invention provides a final-pouring capping method for reducing abrasion of a copper plate of a crystallizer of a moderate-thickness slab caster. The method comprises the following steps of casting speed reducing, residue salvage, final pouring, capping, width regulating of the crystallizer and opening of the copper plate. The method has the advantages that by controlling speed reducing, and speed and time of residue salvage, and by changing a capping mode, blasting accidents easily caused by capping misoperation are eliminated, and production safety is improved; by means of design of opening of the copper plate of the crystallizer and the pulling speed, supercooling tail blanks are prevented from making contact with the copper plate of the crystallizer, abrasion to the copper plate of the crystallizer is reduced, and service life of the crystallizer is prolonged by more than 20%, and good popularizing value is achieved.

Description

Technical field [0001] The invention relates to the technical field of continuous casting, in particular to a method for final casting and capping reducing the wear of the copper plate of the mold of a medium-thick slab continuous casting machine. Background technique [0002] The mold is one of the key equipment of the straight-arc continuous casting machine. In the actual production process of continuous casting, the copper plate of the mold is subject to the static pressure of molten steel and cooling water, cold and heat fatigue, high temperature oxidation of molten steel, and repeated erosion of molten steel. The working environment of the copper plate is very harsh due to chemical corrosion and wear caused by friction during the drawing and vibration process. At present, the final pouring and capping work flow of the straight-arc continuous caster is: reduce the drawing speed-remove the slag-cap-cap-clean the machine-pull the tail blank out of the mold, all of which are cap...

AI Technical Summary

Problems solved by technology

At present, the working process of final pouring and capping of straight arc continuous casting machine is as follows: lowering the casting speed - removing slag - capping - cleaning machine - pulling the tail billet out of the crystallizer, all of which adopt the method of water capping, with water capping Existing problems: 1. Improper capping operation is prone to "blasting" accidents, which may easily cause personal injury

(The accident of blasting is that the molten steel in contact with water produces a large amount of water vapor, which explodes in the limited space of the crystallizer) 2. During the final casting process of the continuous casting machine, the shell of the billet after capping is relatively hard, which is For the mold copper plate of the straight arc continuous casting machine, when the tail billet leaves the mold, it will wear a lot on the lower mouth of the mold. The overcooling of the tail billet will cause more serious wear to the mold copper plate. Regarding the quality of the continuous casting slab, the general crystallizer copper plate has a low service life due to wear and tear, generally about 400 furnaces. Frequent replacement will cause incoherent production, reduce production efficiency, increase equipment investment, and increase production costs. cost