低碳连铸保护渣对水口耐材的侵蚀行为

doi:10.13228/j.boyuan.issn0449-749x.20220261

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Abstract In order to achieve the goal of "double carbon", domestic iron and steel enterprises are currently committed to developing high-performance low-carbon and ultra-low carbon mold powder. Low carbon or ultra-low carbon mold flux has appropriate physical and chemical properties,which is the basic condition to ensure efficient and stable continuous casting production. However,there is little research on the wetting and erosion behavior of low carbon mold flux on submerged nozzle materials. In this paper,the wetting and erosion behavior between medium and low carbon mold flux and ZrO₂-C nozzle refractory were studied through high temperature wetting experiment. Combined with microstructure analysis,the erosion mechanism of low carbon mold flux on nozzle slag line material was clarified. The results show that the wettability of low-carbon mold flux and ZrO₂-C nozzle refractory is better,and compared with the traditional medium carbon mold flux,the contact angle between low-carbon mold flux and ZrO₂-C material is smaller and the mold flux spreads faster on the nozzle surface at the same temperature range. According to the microstructure analysis,the erosion degree of low-carbon protective slag on ZrO₂-C material of nozzle slag line is serious, and the erosion depth is large. Due to the influence of carbon content,the wettability between low-carbon mold flux and ZrO₂-C material of nozzle slag line is better,which provides favorable kinetic conditions for the dissolution and penetration of low-carbon mold flux into the nozzle. In addition,compared with medium carbon slag,the carbon concentration difference between low-carbon mold flux and nozzle material is larger,resulting in greater diffusion driving force of carbon atoms,which affects the wetting,dissolution and chemical reaction of the interface between the two phases. In addition, the industrial test results show that the necking of the slag line of the immersed nozzle is more serious when the low-carbon mold powder is used during the continuous casting production process. The results of this study can provide certain guidance and reference for the continuous casting production.

Key words： green and low carbon low carbon mold flux submerged nozzle wetting erosion

Received: 18 April 2022

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	WU Yu-han
	CHEN Wen
	YANG Xin
	HE Zhi-jun

Cite this article:

WU Yu-han,CHEN Wen,YANG Xin等. Erosion behavior of low carbon mold flux on submerged nozzle refractory[J]. Iron and Steel, 2022, 57(10): 120-126.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20220261 OR http://www.chinamet.cn/Jweb_gt/EN/Y2022/V57/I10/120

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