When the La content increases to 0.0425 wt.%, the original MnS and Al 2O 3 inclusions are completely modified into La 2O 2S and La 2O 3 but the inclusions demonstrate serious agglomeration and growth. Meanwhile, the average size of inclusions significantly decreases from 3.4 to 2.48 μm and the distribution is more dispersive. As La content increases from 0.0075 to 0.0184 wt.%, the dominant inclusions transform from MnS, LaAlO 3, and Al 2O 3-LaAlO 3 into MnS, La 2O 3, and LaAlO 3-La 2O 3. The results demonstrate that the main inclusions in weathering steel without La addition are large-sized irregular Al 2O 3 and MnS, with an average size of about 5.35 μm. The effect of lanthanum addition on the formation behaviors of inclusions in Q355B weathering steel was investigated by laboratory experiments and thermodynamic calculations.
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