The transformation of MgO•Al2O3 based inclusions in alloy steel during refining has been studied by industrial trials. Besides Factsage software is applied to study the formation and modification of spinel inclusions in alloy steel using calcium treatment during refining process. The results show the transformation sequence of inclusions is: MgO•Al2O3 → CaO–Al2O3–MgO complex inclusions → MgO•Al2O3; In order to avoid forming MgOAl2O3 inclusions, the content of dissolved Ca in the molten steel has to reach 1ppm.
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