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采用1∶1水模型和工业插钉法研究了吹氩板坯连铸结晶器内钢水流态,并讨论了通钢量、吹氩量、水口浸入深度与水口结构对结晶器流态的影响。水模型结果发现,结晶器内宏观流态主要包括双股流和单股流,钢水通量和吹氩量是影响结晶器内钢水流态的决定性因素。为得到双股流,应采用高通钢量和低吹氩量,缩小断面、增大浸入深度和使用凸底水口有利于双股流形成。基于水模型结果,为维持结晶器内双股流态,在实际浇铸中提出减少连铸过程吹氩量低于临界吹氩量,在宽断面和低拉速下使用凸底水口等措施。工业插钉试验结果与水模型吻合较好,这表明水模型结果可指导现场浇铸实践。
The 1: 1 water model and the industrial stud method were used to study the flow pattern of molten steel in the mold for continuous casting of argon blowing slab. The effects of the amount of steel flowing in, the amount of argon bubbling, the depth of immersion and the nozzle structure on the flow pattern of the mold . The results of water model show that the macroscopic fluid flow in the mold mainly includes double-flow and single-flow, and the flux of molten steel and the amount of argon blown are the decisive factors that affect the fluid flow in the mold. In order to obtain double-strand flow, high-pass steel and low-volume argon should be used to reduce the cross-section, increase the depth of immersion and use the convex-bottom outlet to facilitate double-strand flow formation. Based on the water model results, in order to maintain the double-flow regime in the mold, some measures were put forward to reduce the amount of argon blown during the continuous casting process lower than the critical blowing argon volume and the convex bottom nozzle at wide cross-section and low drawing speed. The results of the industrial stud test are in good agreement with the water model, which shows that the water model results can guide the practice of on-site casting.