CSP生产冷轧用基板线性缺陷的分析与控制  

Analysis and control of sliver defects in cold rolling using sheet steel produced through CSP process

作　　者：隋亚飞[1] 罗钢[1] 段皓杰 冉涛 赵如[1] SUI Ya-fei;LUO Gang;DUAN Hao-jie;RAN Tao;ZHAO Ru(Technology Center,Hunan Valin Lianyuan Iron and Steel Co.,Ltd.,Loudi 417000,Hunan,China)

机构地区：[1]湖南华菱涟源钢铁有限公司技术中心,湖南娄底417000

出　　处：《连铸》2023年第3期74-79,共6页Continuous Casting

摘　　要：为解决CSP工艺下冷轧用基板线性缺陷多发的难题,深入分析冷轧基板热轧卷线性缺陷和冷轧卷线性缺陷,研究缺陷与工艺的相关性,找到了工艺控制关键点。热轧卷缺陷来源于大型保护渣卷渣与水口结瘤物脱落,控制关键点在于氩站钢水的碳含量、LF精炼铝耗与出站钢水的Ca/Al比。冷轧卷缺陷小部分是划伤,大部分是小型保护渣卷渣,两者可通过表检仪形貌进行判别。控制冷轧保护渣缺陷有效措施是控制拉速、稳定节奏、减少炼钢工序的异常情况。通过联合攻关,CSP冷轧基板线性缺陷降等率从8.88%稳定控制到了2.0%以下,具有较强的实际借鉴意义。In order to solve the problem of frequent sliver defects of cold rolling using sheet steel produced through CSP process,the sliver defects of hot-rolled coils and cold-rolled coils of cold rolling using sheet steel were analyzed in depth,the correlation between defects and process parameters was studied,and the key points of process control were found.The defects of hot rolled coils come from the large mold fluxes and nozzle clogs falling off.The key points of control are the carbon content of molten steel in argon station,the aluminum consumption in LF refining processand the Ca/Al ratio of molten steel at end of LF refining.A small part of the slivers of cold rolling coils are scratches,and most of them are small mould fluxes.They can be identified by the appearance of the surface tester.The effective measures to control the mould fluxes slivers are to control the casting speed,stabilize the productionr-hythm,and reduce the abnormal situation of the steelmaking process.Through joint research,the sliver defects re-duction rate of CSP cold rolling using sheet steel has been steadily controlled from 8.88%to below 2.0%,which has strong practical reference significance.

关 键 词：线性缺陷 CSP工艺 冷轧基板 相关性分析 Ca/Al比 结晶器卷渣 

分 类 号：TG335.12[金属学及工艺—金属压力加工]