Method and device for improving surface quality of cast blank of continuous casting machine by adding covering slag

Abstract

The invention relates to a method and a device for improving the surface quality of a cast blank of a continuous casting machine by adding covering slag. The device comprises a crystallizer, wherein a crystallizer liquid covering slag adding system is connected to a crystallizer opening in the upper part of the crystallizer; by means of the system, solid covering slag is molten by using a medium frequency induction heating technology and is then heated to a certain temperature, the outflow volume of liquid covering slag is controlled by adopting a stopper bar, and the liquid covering slag is added into the crystallizer after passing through a liquid covering slag distributor and a guide pipe, so as to form a full-liquid covering slag layer at the upper part of molten steel in the crystallizer. Meanwhile, a crystallizer heat-insulation cover is additionally arranged at the upper part of the crystallizer to reduce radiant heat loss at the upper part of the crystallizer. According to the method and the device disclosed by the invention, the liquid covering slag is added to the continuous casting machine, and the addition amount of the liquid covering slag is controlled according to the thickness of the liquid covering slag layer, such that the surface quality of a continuously cast blank is improved; in addition, The method disclosed by the invention is a substitute method of a conventional solid covering slag adding method for a continuous casting machine, has universality and can be applied to various continuous casting machines for, such as, square billets, round billets and plate billets.

Description

technical field [0001] The invention relates to the field of improving the metallurgical process, in particular to a process for improving the surface quality of the casting slab by adding mold slag applied to the casting slab of a continuous casting machine. Background technique [0002] At present, all iron and steel metallurgical enterprises are equipped with continuous casting production lines. Iron and steel continuous casting production is a necessary link in modern iron and steel metallurgical technology, and the continuous casting ratio represents the advanced level of iron and steel metallurgy technology. The continuous casting machine is used to produce round billets, square billets, slabs and other billets supplied to the rolling mill, and mold slag is a necessary consumable for the production of the continuous casting machine. Mold slag is added through the upper part of the continuous casting machine crystallizer to play the role of heat insulation, oxidation pr...

AI Technical Summary

Problems solved by technology

[0006] In order to solve the existing problems of adding solid mold slag in the upper part of the crystallizer to absorb a large amount of heat energy, requiring the superheat of molten steel to reach a certain value and difficult to cast steel with low superheat of molten steel, and the resulting surface quality of the slab deteriorating, and even steel breakout accidents, the present invention provides a method and device for improving the surface quality of continuous caster slabs by adding mold slag. The method is to add liquid mold slag to the continuous Thickness, controlling the amount of liquid mold slag added is conducive to improving the surface quality of continuous casting slabs

Images