连铸保护渣特性对X55SiCrA弹簧钢铸坯角部裂纹和盘条质量的影响

doi:10.13228/j.boyuan.issn1005-4006.20230051

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Abstract In order to improve the billet corner cracks and rolling wire rod quality of X55SiCrA spring steel, the wire rod and billet cracks were analyzed, and the composition of continuous casting mold slag was optimized. The results showed that decarburization behavior occur on both sides of the rolling wire rod crack and the longitudinal crack at the corner of the casting billet. There are high-temperature oxide dots near the longitudinal crack at the corner of the casting billet, and slag composition is found inside the longitudinal crack at the corner of the casting billet. When the slag alkalinity increases from 0.62 to 1.02, the Na₂O content increases from about 6% to 12%, and the F^- content increases from about 3% to 7%-8%, the slag type transforms from acidic slag to alkaline slag, which ensures the slag lubrication ability, improves its crystallization performance and ability to control heat transfer. When using the optimized slag to cast X55SiCrA spring steel, the longitudinal cracks at billet corners are eliminated. Compared with the rolling wire rod quality when using the original slag and the optimization slag to cast billet, the rejection rate of using optimized slag to cast billet has decreased from over 40% to less than 5%, which greatly improves the yield and the product quality of rolling wire rod.

Key words： billet corner cracks continuous casting slag crystallization performance control heat transfer ability rolling wire rod yield

Received: 12 June 2023

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	Articles by authors
	YE Mingzai
	SHI Weining
	LI Hongxing
	WANG Jun
	ZHANG Xubin

Cite this article:

YE Mingzai,SHI Weining,LI Hongxing等. Effect of continuous casting mold slag characteristics on billet corner cracks and wire rod quality of X55SiCrA spring steel[J]. CONTINUOUS CASTING, 2023, 42(5): 28-34.

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http://www.chinamet.cn/Jweb_lz/EN/10.13228/j.boyuan.issn1005-4006.20230051 OR http://www.chinamet.cn/Jweb_lz/EN/Y2023/V42/I5/28

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