低碳铝镇静钢冷轧基板表面起皮缺陷成因分析及控制  

Causes analysis and control of peeling on low carbon Al-killed steel cold rolling substrate

作　　者：杨秀枝[1] YANG Xiu-zhi(Valin Lianyuan Iron and Steel Co., Ltd., Loudi 417009, Hunan, Chin)

机构地区：[1]湖南华菱涟源钢铁有限公司

出　　处：《连铸》2018年第1期73-76,共4页Continuous Casting

摘　　要：本文通过金相检验、扫描电镜观察、能谱分析、板坯剥皮检测等手段,结合工艺数据分析,对涟钢低碳铝镇静钢冷轧基板表面起皮缺陷形成的原因进行了深入研究,并提出了控制方案。结果表明：引起冷轧基板表面起皮缺陷的主要原因为连铸非稳态下的二冷控制不当形成的铸坯表面横裂纹。通过制定优化二冷强度和消除扇形段漏水的等方案,有效解决了冷轧基板表面起皮的问题,显著降低了该钢种的热轧不合格率。The cause of surface peeling defect on low carbon Al-killed steel cold rolling substrate in Lianyuan Steel is studied by means of optical metallographic microscope,SEM observation,energy spectrum analysis,slab examination after scarfing,and combined with process data statistics. The results show that the source of cold rolling substrate surface peeling is surface transversal crack on slab,which caused by secondary cooling condition in unstable case. By making control program of optimizing secondary cooling intensity and eliminating water leakage of segment,the quality problem of surface peeling on cold rolling substrate is effectively solved,the hot rolling reject percentage of this steel grade is observably reduced.

关 键 词：表面起皮 横裂纹 二冷制度 

分 类 号：TG142.15[一般工业技术—材料科学与工程] TG335.12[金属学及工艺—金属材料]