The impingements of supersonic oxygen jets on molten steel and slag in an 85 t top-blown convertor bath were studied and the flow field of molten bath was analyzed. The results show that with the lance height rising from 1.2 m to 1.8 m, the maximum velocity of liquid steel that 0.2 m under the molten steel surface decreases from 0.48 m/s to 0.27 m/s. However, the maximum velocity of liquid steel that 0.8 m under the molten steel surface increases from 0.06 m/s to 0.09 m/s. Therefore, High lance

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... position has a positive effect on the homogeneous distribution of liquid steel velocity. The influence of oxygen flow rate on molten steel's flow field was analyzed in this paper. As shown in the result, when the intensity of oxygen supplied increasing from 235 m 3 ·(h·t) -1 to 333 m 3 ·(h·t) -1 , the circulating direction of molten steel changes inversely.