钢锭轧制材料分层缺陷形成机理及控制研究

Study on formation mechanism and control of layered defects in ingot rolling materials

研究了河钢集团舞钢公司钢锭轧制时轧材中分层缺陷产生的成因和控制技术措施。结果表明,板材厚度方向上中间区域处尺寸80μm以上的簇状Al2O3夹杂物以及保护渣卷入所形成的夹杂物是造成超声波探伤不合格的主要原因。基于此,提出了解决锭材尾部分层性缺陷的方案:采用顺序脱氧方法,推行软吹氩制度,并实行保护浇铸;优化保护渣理化性能指标,防止保护渣卷入。通过以上措施锭材尾部分层性缺陷由3.5%下降到1.5%。

In this paper, the causes and control measures of laminar defects in rolled steel during ingot rolling in Wuyang Iron and Steel Works were studied. The results show that cluster Al2O3 inclusions with a size of more than 80 μm in the middle zone along the thickness direction of the plate and inclusions formed by the inclusions involved in the mold flux are the main reasons for the unqualified ultrasonic flaw detection. Based on this, a scheme to solve the laminar defect of ingot tail part is proposed: adopting sequential deoxidization method, implementing soft argon blowing system, and implementing protective casting;optimizing the physical and chemical properties of mold powder to prevent its involvement. Through the above measures, the laminar defects of ingot tail decreased from 3.5 % to 1.5 %.