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Aiming at the unsatisfactory removal rate of various inclusions in refining process of spring steel in a steel plant, this study proposes a unequal flow bottom blowing method with an inlet flow ratio of 2:1, and its effectiveness is verified by numerical simulation and actual production. The numerical simulation results show that under the 2:1 bottom blowing method, the molten steel has greater axial flow strength, which is conducive to the inclusion floating to the slag layer. The removal rate of inclusions under the 2:1 bottom blowing method is about 8% higher than that of the equal flow. The production results are consistent with the numerical simulation, when the inlet flow is 100 NL/min, the inclusion removal rate under 2:1 bottom blowing method is about 18% higher than that of equal flow, meanwhile, the total number of inclusions and large size inclusions are lower than that of equal flow.

Numerical simulation on inclusion removal behaviours in refining processes of spring steel