方坯中间包包盖吹氩数值计算研究与应用

doi:10.13228/j.boyuan.issn1006-9356.20230189

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Abstract During continuous casting process, oxygen content in tundish can be significantly decreased by argon blowing from tundish cover(ABTC), and thus obviously improves the effect of tundish protective casting and decreases the secondary oxidation of molten steel. A tundish of six-strand bloom continuous casting machine was taken as the research object, and numerical calculation models of ABTC for stage of empty tundish and stage of stable casting were developed. To validate the accuracy of calculation models, the hand hold gas analyzer was applied to measure the oxygen content in tundish with different argon flow rate and argon blowing time. The measured oxygen content was compared with the calculated results, and the relative error was less than 7.5%。With the calculation models, the oxygen content in tundish was calculated and analyzed with different argon blowing scheme (including argon pipe locations, argon flow rate, argon blowing time). Based on the calculation results, the optimal argon blowing scheme is determined, that is installing the argon pipes on either side of the tundish conver holes, sealing the baking holes, keeping stopper rod holes open, the argon flow is not less than 120 m³/h during the period of empty tundish and not less than 60 m³/h during the period of stable casting stage. Industrial experiment of ABTC was carried out. The experimental results indicate that the oxygen mass fraction in tundish can be maintained at less than 0.1%, the increased nitrogen in steel from RH to tundish decreases by 18.3% from 7.1×10^-6 to 5.8×10^-6, and the inclusion rating of Class B and C are also improved. The present work provides theoretical guide for designing ABTC to improve the protective effect of tundish.

Key words： continuous casting bloom tundish argon blowing cleanliness inclusion

Received: 29 March 2023

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	Articles by authors
	WU Chenhui
	LI Yang
	BAI Xuxu
	SHI Peng
	GUI Tianhao

Cite this article:

WU Chenhui,LI Yang,BAI Xuxu等. Numerical calculation and application of argon blowing from bloom tundish cover[J]. China Metallurgy, 2023, 33(8): 104-111.

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http://www.zgyj.ac.cn/EN/10.13228/j.boyuan.issn1006-9356.20230189 OR http://www.zgyj.ac.cn/EN/Y2023/V33/I8/104

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