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本文分析研究了浸入式水口的多孔质耐火衬与钢水间反应对气泡性缺陷发生率的影响,并探讨了通过使用不与钢水发生反应的无二氧化硅多孔质耐火衬可以防止气泡性缺陷发生的机理。结论如下:(1)气泡性缺陷是由直径0.5mm 以上的氩气气泡造成的,特别是直径1.0mm 以上的氩气气泡对钢板气泡性缺陷的发生率直接有关。(2)在浇铸后期,随着多孔质耐火衬与钢水反应的增加,氩气气泡直径变大,这说明了气泡性缺陷发生率与连铸炉数之间有对应关系。(3)使用与钢水不发生反应的无二氧化硅多孔质耐火衬的浸入式水口,可稳定地向钢水里喷吹细微的氩气气泡,这有助于防止钢板中气泡性缺陷的发生。
This paper analyzes the influence of the reaction between porous refractory lining and molten steel on the incidence of bubble defects in submerged entry nozzles and discusses the prevention of bubble defects by using a silica-free, porous refractory lining that does not react with molten steel The mechanism. Conclusions are as follows: (1) Bubble defects are caused by argon bubbles with a diameter of 0.5mm or more. Especially, bubbles with argon gas bubbles with a diameter of 1.0mm or above are directly related to the incidence of blistering defects in the steel plate. (2) In the later stage of casting, with the increase of the reaction between porous refractory lining and molten steel, the diameter of argon bubble becomes larger, which shows the correspondence between the incidence of bubble defects and the number of continuous casting furnace. (3) The use of a submerged nozzle without a silica porous refractory lining that does not react with the molten steel can stably spray fine argon bubbles into the molten steel, which helps to prevent occurrence of blistering defects in the steel sheet.