超低碳IF钢边部翘皮缺陷改善及控制探究

Improvement and control of edge skin-warping defects in ultralow carbon IF steel

针对热冷轧板卷生产过程中的质量问题,通过系统取样,借助于金相显微镜、扫描电镜SEM和EDS能谱分析仪对IF钢热轧板的表面缺陷进行了分析,确定了铸坯及板卷典型质量缺陷的产生原因或机制,针对性地研究连铸工艺关键参数以及加热炉加热制度与翘皮缺陷之间的耦合关系,并提出了降低翘皮缺陷发生率的控制措施,通过工业化试验,试验铸坯连退工序冶金缺陷较之前钢种铸坯降低了1.43%,降低幅度为26.63%,降级改判降低了1.11%,降低幅度为43.70%。

In order to solve the quality problems in hot or cold rolled strip production,the surface defects of hot rolled strip of IF steel were analyzed by means of metallographic microscope,SEM and EDS,and the causes and mechanisms of the typical quality defects in slab and strip were determined.The coupling relationship between the key parameters of continuous casting process and the heating system of reheating furnace and the surface warping defects were studied,and the control measures to reduce the incidence of surface warping defects were put forward.Through the industrial test,the metallurgical defects of the continuous annealing process of the test casting billet were reduced by 1.43%,the reduction rate was 26.63%,and the extent of reduction was 1.11%and 43.70%.