A kind of slagging device and method for feeding steel belt of gas shielded continuous casting crystallizer

Abstract

A slag discharge device and method for a steel feeding belt in a gas-protected continuous casting mold, used in a continuous casting mold. There is molten steel in the crystallizer, and there is protective slag on the top surface of the molten steel. The slag discharge device includes a hollow cover body , the top of the cover body is provided with an upper cover, and the upper cover is provided with a feed port and an air inlet. The feed port is for feeding the steel strip, and the air inlet is for inert gas to enter. The lower end of the cover body enters the molten steel, and the lower end of the cover body enters the molten steel. The bottom is connected with a steel slag discharging piece. The steel slag discharging piece displaces the protective slag and enters the molten steel. The size of the steel slag discharging piece gradually decreases from top to bottom. Inert gas enters from the air inlet and is discharged from the pores of the feed port to protect the molten steel from oxidation. At the same time, when the slag discharge device extends into the crystallizer, the steel slag discharge parts with a narrow lower part and a wide upper part remove the protective slag. Displace it so that the cover body is partially immersed in the molten steel to prevent the protective slag from entering the cover body. Therefore, when the steel strip is inserted into the molten steel, it will not touch the protective slag and prevent the protective slag from entering the molten steel.

Description

technical field [0001] The invention belongs to the process of feeding a steel strip to a crystallizer in the continuous casting process of high-quality steel, in particular to a slagging device and method for feeding a steel strip to a gas-protected continuous casting crystallizer. Background technique [0002] The continuous casting process is a major technical progress and has been widely used in actual production, but there are still many problems restricting the quality of continuous casting products. In the continuous casting process, the main problems to be solved in the continuous casting production of thin strips and thin slabs are to improve the cleanliness of molten steel, increase the casting speed and have no defects on the surface of the slab. The common problems to be solved for medium-thick slabs, extra-thick slabs and thicker rectangular slabs are internal quality defects such as center segregation, center porosity, center cracks, and low equiaxed crystal ra...

AI Technical Summary

Problems solved by technology

However, there are still some problems with this technology in practical industrial applications

Since the steel belt needs to be extended into the crystallizer, if it is directly inserted, it is easy to bring mold slag into the molten steel, causing contamination of the molten steel

If the slag is directly discharged without taking protective measures, the molten steel will be exposed to the air, and its surface is easily oxidized, which will eventually affect the composition of the molten steel.

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