超低硫钢冶炼工艺研究.pdfVIP

1 超低硫钢冶炼工艺研究 1 1 1 1 1 2 2 李战军 刘金刚 王文军 柴玉国 姜中行 白学军 朱志远 （1. 首钢技术研究院，北京 100043 ； 2. 秦皇岛首秦金属材料有限公司，秦皇岛 066326) 摘 要 本文介绍了利用“铁水脱硫预处理—转炉—LF—RH—板坯连铸”工艺流程，实现了[S]≤0.0015%超低硫钢 生产，冶炼过程硫含量控制采用喷吹颗粒镁进行铁水深脱硫预处理，脱后的硫含量为0.0045%，进行扒渣操作，扒 渣率要求80%~90%；转炉采用优质废钢和辅料抑制回硫，回硫量控制在0.0015% 以内；LF 炉控制钢水温度、钢液 氧化性、炉渣成分和底吹，精炼结束钢中平均硫含量0.0008%，脱硫率可以达到85.96%；RH 和连铸过程中硫增量 控制在0.0001% 以内。采用上述工艺，实现了超低硫钢批量生产，钢中硫含量平均控制水平为0.0008%，波动范围 控制0.0004%~0.0012% 。 关键词 超低硫钢 铁水脱硫预处理 转炉回硫 LF 炉深脱硫 Study on Process of Ultra-Low Sulfur Steel Li Zhanjun1 Liu Jingang1 Wang Wenjun1 Chai Yuguo1 Jiang Zhonghang1 Bai Xuejun2 Zhu Zhiyuan2 （1. Technical Research Institute,Shougang Group, Beijing, 100043; 2. ShouQin Company Ltd., Qinhuangdao, 066326) Abstract The process of ultra-low sulphur steel, the content of [S]≤0.0015%, by the routines of desulphurization pretreatment-converter-LF refining-RH-slab continuous process is described, the content of sulphur is less than 0.0045% by deep desulphurization pretreatment which injection magnesium, the rate of slag removal is 80%~90% by slag skimming operate; the converter addition sulphur is less than 0.0015% by using high quality scrap and assistant materials; the average content of sulphur is 0.0008% by controlling the temperature of steel, slag oxidizing, slag composition and bottom blowing in LF refining, desulfurization rate can reach 85.96%; the addition of sulphur is less than 0.0001% by RH refining and continuous casting process. Using the abov