GCr15轴承钢连铸过程MgO·Al<sub>2</sub>O<sub>3</sub>夹杂物形成机理

doi:10.13228/j.boyuan.issn0449-749x.20220703

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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.

Key words： GCr15 continuous casting MgO·Al₂O₃ oxidation tundish covering flux

Received: 13 November 2022

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	Articles by authors
	ZHANG Jian-bin
	XU Jian-fei
	WANG Kun-peng
	WANG Ying
	YANG Pu
	CHEN Ting-jun

Cite this article:

ZHANG Jian-bin,XU Jian-fei,WANG Kun-peng等. Formation mechanism of MgO·Al₂O₃ inclusions in GCr15 steel in continuous casting[J]. Iron and Steel, 2023, 58(5): 83-91.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20220703 OR http://www.chinamet.cn/Jweb_gt/EN/Y2023/V58/I5/83

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