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Formation mechanism of MgO·Al2O3 inclusions in GCr15 steel in continuous casting |
ZHANG Jian-bin, XU Jian-fei, WANG Kun-peng, WANG Ying, YANG Pu, CHEN Ting-jun |
Zenith Special Steel Co., Ltd., Zenith Steel Group Co., Ltd., Changzhou 213011, Jiangsu, China |
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Abstract The compositions of inclusions were analyzed in GCr15 steel in LF refining, RH degassing and continuous casting. The inclusions were composed of MgO·Al2O3 with a small amount of calcium aluminate after LF refining. Many MgO·Al2O3 inclusions were detected in the continuous casting although the inclusions were calcium aluminate after RH degassing. Using Al2O3-based tundish working lining and low content of MgO covering flux, and unchanging other parameters of continuous casting, MgO·Al2O3 inclusions were also be detected in large numbers in the tundish, indicating the reaction of steel-slag-refractory in the tundish was not the mainly reason for the formation of MgO·Al2O3 inclusions. However, many MgO·Al2O3 inclusions could be detected when the molten steel without MgO·Al2O3 inclusions reacted with the packing sand with high contents of SiO2, Cr2O3 and Fe2O3, which means the slight oxidation of molten steel could lead to the formation of MgO·Al2O3 inclusions. High contents of FeO and Cr2O3were found in the tundish flux and decreased with the casting goes on, indicating the existence of the reactions between Al in the molten steel and FeO, Cr2O3in the tundish flux, which leads to the oxidation of molten steel. Therefore, the composition control of tundish flux was important to the formation of MgO·Al2O3 inclusions.
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Received: 13 November 2022
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