Analysis of Inclusion Behavior in a Ladle Refining Process by a Newly Developed Coagulation Model

摘要

A new model war developed to analyze thecoagulation behavior of inclusions in the molten steel during the secondaryrefining process. The advantage of themodel is to calculate the behavior of two types of inclusions, such as aluminainclusion and slag-origin inclusion, which is a slag particle engulfed by theflow at the surface of the molten steel.The flow of the molten steel in a ladle is calculated by using a large eddysimulation model, and several kinds of inclusion collision modes are consideredin the coagulation model. Inclusion analysis experiments were carried out inthe secondary refining process, changin the flow rate of Ar gas injected frombottom of the ladle; the results were compared with the calculation. It isconcluded that the increase in Ar gas flowrate increases the number of inclusions byenhancing the slag particle engulfed at the surface of the molten steel. Theeffect of Ar gas flow rate on the numberof inclusions seems to he small within therange of Ar gas flow rate investigated.