低碳铝镇静钢冷轧基板表面起皮缺陷成因分析及控制
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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.
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.
引文
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[2]祝桂合,万友堂,张继明,等.钢板表面裂纹及氧化物圆点形成条件模拟试验[J].山东冶金,2012,34(2):30.
[3]温维新.中厚板边部裂纹缺陷的成因分析及对策[J].连铸,2011,6:43.
[4]罗衍军,刘柏松,苑鹏,等.连铸工艺对超低碳钢表面线状缺陷的影响分析[J].连铸,2016,41(5):62.