超低碳铝脱氧钢中FeO<i><sub>x</sub></i>对水口结瘤的影响

doi:10.13228/j.boyuan.issn0449-749x.20200222

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Abstract The nozzle clogging of an ultra-low carbon Al-killed steel was analyzed using scanning electron microscopy-energy dispersive spectrometer to study the formation and evolution of FeO_x containing clogs. Clogs were divided into the frozen steel layer and the main layer. Due to the difference in morphology and composition of oxides, the main layer of clogs presented obvious stratification phenomenon and varied from the matrix of the nozzle to the molten steel as follow: a network formed by elongated strips of Al₂O₃,single particles of Al₂O₃ distributed in a dotted pattern, continuous sheets of FeO_x-Al₂O₃ and dot-like particles of Al₂O₃. There was a thin layer of FeO_x-Al₂O₃ at the edge of frozen steels with the main components of FeO_x,Al₂O₃ and FeO·Al₂O₃. In the FeO_x-Al₂O₃ layer,the part near the frozen steel had a higher content of Al₂O₃,while the part relatively far from the frozen steel had a higher content of FeO_x. Thermodynamic calculation results show that when the content of [O] in the molten steel at 1 536 ℃ is greater than 0.041 0%,FeO and FeO·Al₂O₃ can be generated in the molten steel. When oxidation occurs,composite oxides of FeO_x-Al₂O₃ form first. Then FeO_x will react with [Al] in the steel drop and Al₂O₃ will be formed,while the external Al₂O₃ will adhere to the composite oxide of FeO_x-Al₂O₃. FeO_x acted as a binder in the nozzle clogging.

Key words： ultra-low carbon Al-killed IF steel nozzle clogging FeO_x morphology and composition thermodynamic calculation

Received: 28 April 2020

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	HUANG Ri-kang
	ZHANG Li-feng
	JIANG Ren-bo
	GUO Yin-tao
	ZHOU Qiu-yue
	DUAN Hao-jian

Cite this article:

HUANG Ri-kang,ZHANG Li-feng,JIANG Ren-bo等. Effect of FeO_x in an ultra-low carbon Al-killed steel on nozzle clogging[J]. Iron and Steel, 2021, 56(1): 43-50.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20200222 OR http://www.chinamet.cn/Jweb_gt/EN/Y2021/V56/I1/43

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