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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摘要 CSP线100 t转炉生产SPHD冷轧夹杂物降等比例比较高,经分析夹杂降等主要原因是钢水夹杂物去除不彻底。通过优化转炉脱氧工艺减少夹杂产生,提高转炉终点温度减少LF处理过程中钢水中铝的氧化;精炼炉采用钢包渣循环渣利用快速造白渣,控制钢包渣w((CaO))/ w((Al₂O₃))为1.4～1.8,碱度为18～25,喂钙线前白渣时间大于8 min, LF炉出站镇静大于15 min促进夹杂的去除;开浇前中间包用氩气吹扫2 min、加硅钙粉防止开浇塞棒上涨,确保浇铸过程中恒拉速、钢包换包时中间包钢水大于20 t减少液位波动。最终基板夹杂降等率由1.8%降低至0.2%。

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	刘彭
	隋亚飞
	徐刚军
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关键词 ：低碳低硅钢: 夹杂缺陷, 洁净度, 工艺优化

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

收稿日期: 2019-05-17

引用本文:

刘彭, 隋亚飞, 徐刚军, 周军军, 曾全文. 低碳钢夹杂物产生原因及控制[J]. 钢铁, 2020, 55(2): 67-74. LIU Peng, SUI Ya-fei, XU Gang-jun, ZHOU Jun-jun, ZENG Quan-wen. Inclusion generation and control of low carbon steel. Iron and Steel, 2020, 55(2): 67-74.

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