吹氩板坯连铸结晶器内钢水流态

 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。

Flow pattern in continuous casting slab mold with argon blowing

A full scale water modeling and nail-dipping experiments were carried out to investigate the flow patterns in the slab mold with argon blowing. The effects of steel throughputs,argon bubbling flowrates,SEN immersion depths and SEN structures on the flow patterns were discussed. The results show that double roll flow (DRF) and single roll flow (SRF) are the main flow patterns in argon-blowing slab casting mold and the steel throughputs and the argon blowing flowrates are the dominating parameters to determine their modes. To obtain the DRF,promoting the steel throughput,re-ducing the gas flowrate,narrowing the mold width,increasing the SEN depth and using the mountain-bottom SEN should be conducted. Based on the water modeling results,a critical argon flowrate under different casting combinations was put forward and mountain-bottom should be used in low casting speed/large width dimension condition. Nail dip-ping measurement results agree well with the water modeling,which show the water modeling results can guide the cast-ing practice to obtain the DRF.