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<正>The formation of CaO-TiO_2-MgO-Al_2O_3 dual phase inclusion in 321 stainless steel was investigated in the laboratory. The result indicated that the condition for the formation of CaOTiO_2-MgOAl_2O_3 in 321 steel is [Ca]>0.001wt%, [Ti]>0.1wt%, an