低碳钢夹杂物产生原因及控制

doi:10.13228/j.boyuan.issn0449-749x.20190218

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Abstract High reduction ratio of inclusions in SPHD cold rolling produced by 100 t converter in CSP plant. The main reason for inclusion reduction is that the inclusion removal in steel is not complete. By optimizing the deoxidization process of converter reduce the generation of inclusions, increase the end point temperature of converter, the loss of Al in LF treatment process is reduced. Recycling refining slag was used for making slag quickly, the w((CaO))/w((Al₂O₃)) was controlled from 1.4 to 1.8, basic 18-25, the white slag time before feeding calcium was maintained for more than 8 minutes, LF furnace sedation time is more than 15 minutes promote the removal of inclusions; Argon blowing in tundish for 2 min and adding calcium silicate powder before pouring to prevent the stopperrising in first casting stages, controlling the constant casting speed, keep tundish steel weight＞20 t to reduce the liquid level fluctuation during casting. Based on the above measures, the SPHD downgrade rate for inclusions decreased from 1.8% to 0.2%.

Key words： low carbon and low silicon steel inclusion defect cleanliness process optimization

Received: 17 May 2019

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	Articles by authors
	LIU Peng
	SUI Ya-fei
	XU Gang-jun
	ZHOU Jun-jun
	ZENG Quan-wen

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LIU Peng,SUI Ya-fei,XU Gang-jun等. Inclusion generation and control of low carbon steel[J]. Iron and Steel, 2020, 55(2): 67-74.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20190218 OR http://www.chinamet.cn/Jweb_gt/EN/Y2020/V55/I2/67

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