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酒钢CSP工艺薄板坯增氮分析
Study on Content of Nitrogen Pick-up in Thin Slab Produced by CSP in JISCO
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- DOI:
- 作者:
- 谢健 谯德高
XIE Jian;QIAO Degao
- 作者单位:
- 酒钢集团宏兴股份有限公司碳钢薄板厂
Jiuquan Iron and Steel(Group)Co.,Ltd.,Jiayuguan 735100,China
- 关键词:
- CSP 精炼工艺 保护浇注 钢液 氮含量
CSP refining process protection cast process molten steel nitrogen content
- 摘要:
- 对酒钢CSP工艺采用的转炉+精炼+连铸+热轧生产线薄板坯的增氮原因进行了调查研究。结果表明,原板坯平均氮含量56×10^-4%,超出了控制范围。从转炉终点到精炼出站过程是钢液增氮较大的环节,这期间由于使用的废钢和合金的氮含量较高造成了精炼增氮。连铸过程中间包钢液并未出现与空气接触的现象,浇注过程的增氮主要来自大包下水口与长水口结合处密封不严密而吸入空气造成增氮。通过对废钢用量进行控制,使用氮含量较低的合金,控制精炼工艺及改进大包下水口与长水口结合处的密封能,使板坯的平均氮含量降至46×10^-4%。
The causes of nitrogen increasing in the thin slab of BOF+LF+CC+HR line used in CSP process in JISCO were investigated. The results show that the average nitrogen content of the raw slab is 56 ×10^-4%, which is out of the control range. The process from the end of the BOF to the refining station is a major step of nitrogen increasing of molten steel,which is caused by the high nitrogen content of scrap steel and alloy used. During the continuous casting process, there is no contact between the molten steel and the air, and the nitrogen increase in the pouring process is mainly caused by the air inhalation caused by the loose seal at the junction of the lower nozzle and the long nozzle. By controlling the amount of scrap steel, using alloys with low nitrogen content, controlling the refining process, and improving the sealing at the junction of the lower nozzle and the long nozzle, the average nitrogen content of the slab can be reduced to 46×10^-4%.