钙处理铝镇静钢连铸锆质水口堵塞机理分析

doi:10.13228/j.boyuan.issn1005-4006.20230042

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Abstract Calcium treatment is an important way to reduce the clogging of aluminum-killed steel during continuous casting. However, in industrial practice, deposition still occurs after calcium treatment.The morphology, composition and element distribution of the clogging and the large size inclusion at the crack initiation were detected and analyzed by scanning electron microscopy, to study the inclusion clogging behavior of aluminum-killed steel treated with calcium at the the Zr-containing bowl and the inner wall without Zr-containing of the nozzle. Results show that CaO-MgO-Al₂O₃ were the main components of both the accumulation of the nozzle and the large size inclusions in the center of the rolled wire, and the mass fraction of 1%-3% ZrO₂ was also detected. It was indicated that there were lots of complex calcium-aluminate inclusions in the steel with the Al₂O₃ percentage larger than 75% at high melting temperature, easy to accumulate in the nozzle during casting. At the same time, the reduction reaction between ZrO₂, SiO₂contained in the bowl of the nozzle and graphite C occured, generating SiO, ZrO and other gases, and diffusing outwards into the accumulated calcium-magnesium-aluminate inclusions, hence, the composite reservoir containing ZrO₂ was formed. The attachments of the Zr-containing clogging melted and fell down, part of them accumulated to the inner wall of the nozzle, and part of them entered into the liquid steel and gathered further during the solidification process. The key is to improve the purity of molten steel and appropriately reduce the content of Als and Ca in steel to decrease the inclusions, especially calcium aluminate. It is also necessary to optimize the material of nozzle to reduce its reactivity.

Key words： aluminum killed steel zirconium nozzle calcium treatment large size inclusions nozzle blockage

Received: 27 May 2023

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	Articles by authors
	LONG Hu
	QIU Wensheng
	LIU Dong
	GUO Junyu
	LI Fuqiang
	LIU Zhilong

Cite this article:

LONG Hu,QIU Wensheng,LIU Dong等. Mechanism of ZrO₂ containing nozzle clogging in continuous casting of calcium treated aluminum killed steel[J]. CONTINUOUS CASTING, 2024, 43(1): 38-45.

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http://www.chinamet.cn/Jweb_lz/EN/10.13228/j.boyuan.issn1005-4006.20230042 OR http://www.chinamet.cn/Jweb_lz/EN/Y2024/V43/I1/38

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