Experiment Study On The Behavior Of Inclusion Removal And Drain Sink Control During Ladle Teeming Process With Argon Injected Into Ladle Around The Tapping Hole

In the continue casting process, the roughing slag from the teeming ladle will result in the reoxidation of steel and slag accumulation in the tundish, worsing the steel quality, lowing the steel yielding rate and affect the normal process of continue casting. The inclusion in the steel have negative effects on the property of the intensity, plasticity, fracture toughness, mach inability, fatigue, hot shortness, and corrosion resistance. For this purpose, this issue focus on the behavior of inclusion removal and drain sink control in using the new technology of argon injected into the ladle around the trapping hole, in order to provide the theoretical basis and guidance of the new technology's field application.In this study, with a ladle of 145 t selected as a prototype, according to the similarity principle,a physical model scaled for 1/5 was built to study the behavior of inclusion removal and drain sink during the new technology process. The process of vortex, critical height of vortex and influencing. First of all, factors of inclusion removal were studied. Influences of gas flow, blowing elements parameter, nozzle position and slag width were investigated. Then, the drain sink control were studied under the rage of gas volume, blowing elements parameter, nozzle position, the viscosity and width of the slag. The main results are as follows:(1) With the gas injected into the ladle,1.12 Nl/min is the critical volume of the slag entrainment under 24 mm slag.(2) Gas volume, blowing element and nozzle position have effects on the inclusion removal. There will be a optimal gas during the highland low rate, the bigger inradius of the blowing elements has a better inclusion removal rate. The 2/3R is the best eccentricity.(3) In this experiment, the best parameter of the inclusion removal in the new technology is 0.28N1/min,3#blowing parameter and 2/3R eccentricity.(4) The injected gas can effectively control the rough slag due to the drain sink. But under the 24 mm slag, the oversize volume and overtop initial blowing height may generate the bubble slag. As for this experiment, in the condition of 50 mm initial blowing and less than 0.75Nl/min can avoid the bubble slag.(5) In no use of the new technology, the critical height of drain sink in the teeming process doesn't change with the viscosity, blowing element position and thickness of the slag. It concentrates upon the height of 24-26.5 mm,1.33?1.47 times of the trap hole radius.(6) The rule of rough slag amount will be different under different slag thickness and blowing element.the accumulate of volume will be help for the decrease of rough slag under 24 mm slag.0.37 Nl/min and 0.75N1/min have the same effect on the rough slag control. The 1# blowing element is superior to the 2# and 3# in the roughing slag control.