Method for judging and handling steel channeling on junction surface of submerged nozzle

Abstract

The invention provides a method for judging and handling steel channeling on the junction surface of a submerged nozzle. The method comprises the following steps of: turning down the argon flow according to the overturning condition of the liquid level of molten steel, detecting a submerged nozzle part under the liquid level by using a stick if the overturning variation of the liquid level is unremarkable, and judging that an air sucking phenomenon exists at a junction surface of the submerged nozzle and a down nozzle if no remarkable crack exists on the upper part of the liquid level; when steel channeling appears on the junction surface, decelerating immediately, turning down the argon flow, communicating an argon tube, and cooling the junction surface at high argon flow; closely watching the opening state of a sliding plate, and appropriately adjusting the argon flow; and recovering the argon flow at an upper nozzle simultaneously, and pulling steel at a low speed till casting is finished. Due to the adoption of the method, the problem of steel channeling on the junction surface can be discovered and handled as early as possible, casting stop accidents caused by steel channeling are avoided, heat recovery and cold recovery of the molten steel are reduced, the accident loss is lowered, and successful performance of production is ensured.

Description

technical field [0001] The invention belongs to the field of continuous casting technology, and in particular relates to an emergency judgment and treatment method for steel channeling at the joint surface of a submerged nozzle and a drain nozzle during the continuous casting process. Background technique [0002] If the joint surface between the submerged nozzle and the drain is not smooth, or the nozzle pad is aged, and there are cracks in air drying, etc., it will cause the steel on the joint surface of the nozzle to slip. , resulting in the accident of being forced to stop pouring, resulting in the cold recovery and heat recovery of molten steel, which not only leads to a decrease in the billet rate and an increase in the secondary treatment of molten steel, which seriously affects the smooth progress of production, directly increases production costs, and will have a negative impact on casting Billet quality has a certain impact, causing great economic losses to the ent...

AI Technical Summary

Problems solved by technology

[0002] If the joint surface between the submerged nozzle and the drain is not smooth, or the nozzle pad is aged, and there are cracks in air drying, etc., it will cause the steel on the joint surface of the nozzle to slip. , resulting in the accident of being forced to stop pouring, resulting in the cold recovery and heat recovery of molten steel, which not only leads to a decrease in the billet rate and an increase in the secondary treatment of molten steel, which seriously affects the smooth progress of production, directly increases production costs, and will have a negative impact on casting The billet quality has a certain impact, causing great economic losses to the enterprise