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The transformation of inclusions was studied when control technology of refining top slag in ladle furnace was used in X80 pipeline steelmaking.Sufficient amount of aluminum was added to experimental heats for final deoxidation during BOF tapping,and then the refining top slag with high basicity and strong reducibility was adopted to transform Al 2 O 3 to inclusions with low melting point.The results show that the composition of inclusions changes in order of “Al 2 O 3 → MgO-Al 2 O 3 system→ CaO-MgO-Al 2 O 3 system→ CaO-Al 2 O 3 system”.And the inclusions after LF refining are liquid or semi-liquid state at the temperature of steelmaking,which are easily removable to obtain high cleanliness steel by collision,agglomeration and flotation.
The transformation of inclusions was studied when control technology of refining top slag in ladle furnace was used in X80 pipeline steelmaking. Sufficient amount of aluminum was added to experimental heats for final deoxidation during BOF tapping, and then the refining top slag with high basicity and strong reducibility was adopted to transform Al 2 O 3 to inclusions with low melting point. The results show that the composition of inclusions changes in order of “Al 2 O 3 → MgO-Al 2 O 3 system → CaO-MgO-Al 2 O 3 system → CaO-Al 2 O 3 system ”. And the inclusions after LF refining are liquid or semi-liquid state at the temperature of steelmaking, which are easily removable to obtain high cleanliness steel by collision, agglomeration and flotation.