Surface Defects of Cold-Rolled Ti-IF Steel Sheets due to Non-Metallic Inclusions

Surface defects of the cold-rolled sheets of Ti-IF steel were studied and analyzed. After analyzing surface defects of cold-rolled sheets, such as shelling defects, holes and sliver defects by SEM/EDS, a variety of inclusions were found. In addition, the distribution of macro-inclusions in slabs was analyzed by MIDAS method. The results show the macroscopic inclusion bands of head slabs and normal slabs are in 1/8 slab thickness regions of both inner arc side and outer arc side. The formation process of the defects in the cold-rolled sheets was simulated with an experimental cold-rolling machine for comparison. The results show that there were three kinds of inclusions underneath the surface defects: Al2O3, SiO2 and particles from slag entrainment, which were the main reason for defect formation during cold rolling.

低碳铝镇静钢冷轧板线状缺陷成因分析

利用扫描电子显微镜和能谱分析对低碳铝镇静钢冷轧板的表面缺陷进行了分析和研究。结果表明,缺陷主要是由高硬度、难变形的Al2O3夹杂引起的。根据生产工艺流程及现场情况预测了Al2O3夹杂来源,并提出了低碳铝镇静钢冷轧板表面质量的改善措施。

薄板表面大面积夹杂产生原因研究及对策

从生产工序的工艺调查入手,对安钢薄板表面大面积夹杂物进行了综合分析研究,结合现场轧制模拟验证,找出了现场坯料污染是导致薄板表面大面积夹杂缺陷的直接原因。通过制定相应措施消除缺陷,有效解决了该类质量问题。

降低薄板钢表面夹杂的攻关实践

针对柳州钢铁集团公司钢板表面夹杂严重的质量问题 ,从管理和工艺方面对夹杂物来源进行分析 ,找出问题所在 ,提出了改善措施 ,基本消除了这一质量缺陷 。