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Abstract The phenomenon that MnS inclusion precipitates on surface of Ti-Al de-oxidation complex inclusion has been studied systematically in lab by utilizing resistance furnace. The effect of Ti-Al complex inclusions on MnS precipitation amount and morphology has been investigated by varying the cooling rate and the content of S in steel. The experiments demonstrated that the cooling rate on the precipitation of MnS have a significant impact on. When the S content in liquid steel from 0.001% to 0.01%, under the conditions in the furnace cooling, MnS precipitation amount as the S content in liquid steel increases. However, in water-cooled conditions, MnS precipitation is not with the amount of liquid steel in an increase in S content of change. When the [S]>0.008% , all the surface of oxide inclusions are precipitated MnS inclusions; When 0.002% ≤ [S] <0.008%, the composite oxide inclusions in the MnO + SiO2 content of the higher, MnS more easily in the oxide above the precipitation. No obvious affect of Ti3O5 and Al2O3 has found on MnS precipitation on complex inclusions. When S <0.002%, the basic no precipitation of MnS inclusions. MnS in the low melting point oxides showed mosaic-like precipitation, the precipitation of high melting point on was shaped encapsulated.
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Received: 20 November 2009
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2010, Vol. 45 
