钢包长水口返钢原因分析与控制  

Cause analysis and control of molten steel return at ladle shroud

作　　者：梅宁 韩龙 袁天祥 王亚宁 杨春宝 赵长亮 刘延强 MEI Ning;HAN Long;YUAN Tianxiang;WANG Yaning;YANG Chunbao;ZHAO Changliang;LIU Yanqiang(Steelmaking Department,Shougang Jingtang Iron and Steel Co.,Ltd.,Tangshan 063200,Hebei,China;Manufacture Division of ShougangJingtang Iron and Steel Co.,Ltd.,Tangshan 063200,Hebei,China;School of Mechanical Engineering,Yanshan University,Qinhuangdao 066000,Hebei,China)

机构地区：[1]首钢京唐钢铁联合有限责任公司炼钢作业部,河北唐山063200 [2]首钢京唐钢铁联合有限责任公司制造部,河北唐山063200 [3]燕山大学机械工程学院,河北秦皇岛066000

出　　处：《连铸》2023年第4期68-72,共5页Continuous Casting

摘　　要：钢包长水口插入中间包钢水中浸入式开浇是连铸工艺实现杜绝钢水二次氧化、提高钢水质量的重要手段,然而,浸入式开浇容易导致长水口碗部发生返钢。针对此问题,通过现场跟踪分析,从设备精度和工艺操作两方面总结了其发生的具体原因。分析结果表明,钢包长水口浸入式开浇返钢与工艺操作方法、机械手精度以及托圈精度有关。通过改进戴长水口操作方式、改造机械手与托圈、规范浸入式深度等措施,钢包长水口返钢发生率由0.2%降低至0,全钢种增氮不高于0.000 3%的合格率由94%提高至98%。The submerged start-up of ladle shroud inserted into tundish is an important means to eliminate the secondary oxidation of molten steel and improve the quality of molten steel in continuous casting process.However,the submerged start-up is easy to lead to the return of steel at the bowl of shroud.In view of the steel returning from the ladle shroud immersed open casting bowl,the specific causes were summarized from two aspects of equipment accuracy and process operation through on-site tracking analysis.The analysis results show that the ladle shroud immersed open cast steel return is related to the process operation method,the manipulator precision and the bead unseating precision.By improving the operation mode of wearing shroud,reforming the manipulator and detaching ring,standardizing immersion depth and other measures,steel return rate of ladle shroud is reduced from 0.2%to 0,and qualified rate of nitrogen increase of all steel grades is increased from 94%to 98%.

关 键 词：长水口 返钢 二次氧化 增氮 中间包 

分 类 号：TF777[冶金工程—钢铁冶金]