板坯连铸结晶器浸入式水口结构研究

Study on Submerged Entry Nozzle Structure in Slab Mold for Continuous Casting

在实验室条件下,基于某厂实际水口结构及生产状况重新设计了4种不同结构的浸入式水口,然后采用1∶1的水模型对该厂600 mm×170 mm断面板坯连铸结晶器的流场特征进行试验,通过对比分析不同拉速下采用不同结构浸入式水口时结晶器内钢液的流场特征的变化情况,从而优选出适合该厂的浸入式水口结构。研究表明,在拉速≤1.6 m/min时,采用底部形状为凸底、出口倾角18°、侧出孔尺寸为40 mm×60 mm的椭圆形水口,结晶器内流场最为理想,即为最优水口结构。

Under laboratory conditions,four kinds of submerged entry nozzle （ SEN） withdifferent structure were redesigned based on the actual nozzle structure and produplant. The characteristic of the flowing field in a slab continuous casting mold with a section of 600 mm by 170 mm was studied by ratio of 1 to 1 water model,then the SEN suitable for the plant was optimized, by comparative analysis at the variation of flowing field in mould with different structuralSEN at different casting speeds. The research results showed that when the casting speed was not greater than 1.6 m/min, the most ideal flow field was obtained by using the oval outlet nozzle with bottom shape of nozzle mountain-bottom, t i lt angle of the nozzle exit of 18°, the of 40 mm by 60 mm, i . e. the optimal SEN structure.