铝脱氧钙处理结构钢凝固冷却过程夹杂物的转变

doi:10.13228/j.boyuan.issn1005-4006.20230037

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Abstract In order to study the transformation mechanism and influencing factors of inclusions during the solidification and cooling process of aluminum deoxidized calcium treated steel, the transformation phenomenon of inclusions in steel with different cleanliness levels was analyzed by taking molten steel samples in tundish and continuous casting slab samples of S335 structural steel. It was found that during the production process of Al-killed Ca treated S335 structural steels, inclusions underwent a transformation from homogeneous CaO-Al₂O₃ to multiphase Al₂O₃+CaS from the molten steel in tundish to the continuous casting slab, accompanied by an increase in the number density and size of inclusions. The transformation mechanism of inclusions during the solidification and cooling process of steel was revealed through thermodynamic calculations. It was found that with the decrease of w(T.[Ca])/w(T.[O]) and the increase of w(T.[O])/w(T.[S]) in the steel, the weight percent of CaO in inclusions in the molten steel decreased. At the same time, the precipitation temperature and precipitation amount of CaS in inclusions decreased during the solidification and cooling process. Based on the transformation phenomenon of inclusions during the solidification and cooling of steels, it could be concluded that when analyzing the composition of inclusions in molten steel, rapid cooling must be carried out after taking out the molten steel sample to avoid the transformation of inclusions during the solidification and cooling process and improve the accuracy of detection.

Key words： S335 structural steel continuous casting solidification and cooling inclusion transformation cleanliness thermodynamic

Received: 15 May 2023

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	Articles by authors
	GAO Jiang
	WANG Leyao
	YANG Wen
	ZHANG Lifeng
	LI Quanhui
	LI Ming

Cite this article:

GAO Jiang,WANG Leyao,YANG Wen等. Transformation of inclusions during the solidification and cooling process of Al-killed Ca treated structural steels[J]. CONTINUOUS CASTING, 2024, 43(1): 26-31.

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http://www.chinamet.cn/Jweb_lz/EN/10.13228/j.boyuan.issn1005-4006.20230037 OR http://www.chinamet.cn/Jweb_lz/EN/Y2024/V43/I1/26

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