摘要
在某热轧厂生产的超低碳钢经常出现细条状和细沙状两种缺陷。通过对两种典型缺陷进行EPMA、SEM与EDS等分析,并结合现场的轧制工艺情况,对这两种缺陷的形成原因进行综合分析。分析结果表明,在两种缺陷附近未发现氧化圆点,缺陷都是在轧制过程中形成。细条状缺陷是由于Mn元素在氧化铁皮内富集,使氧化铁皮与基体的界面处凸凹不平,对氧化铁片产生＂钉扎＂作用;氧化铁皮的剥离性恶化造成除鳞时难除尽,残余的一次氧化铁皮在后续轧制过程中压入而形成。细沙状缺陷是由于F1~F3工作辊辊面氧化膜剥落,使辊面凹凸不平,在后续机架轧制过程中碾入带钢表面,造成三次氧化铁皮压入。并针对两种缺陷的成因提出了相应的防治措施。
The thin strip- shaped and fine sand- shaped defects were usually observed during the ultra- low carbon steel produced in one hot rolling plant. These two types of typical defects were analyzed by EPMA,SEM and EDS. The formation cause of two defects was comprehensively discussed by combining with the rolling process in site. The analysis results indicated that the oxidized round spots were not found near two types of defects. Both defects were formed during the rolling process. The thin strip-shaped defect was due to the enrichment of Mn in oxide scale. The interface between oxide scale and matrix was rough and uneven,rendering the＂pinning＂effect of oxide scale. The deteriorated peeling property of oxide scale resulted in the residue during descaling. The residual primary scale was embedded and formed during the subsequent rolling process. The fine sand-shaped defect was due to the peeling of oxidation film from surfaces of F1-F3 work rolls,causing the rough and uneven roll surface. It was rolled into the surface of strip steel during the subsequent rolling of stand. As a result,the third oxide scale was embedded. The corresponding improvement measures for two types of defects were also proposed.
出处
《物理测试》
CAS
2016年第2期42-46,共5页
Physics Examination and Testing
关键词
热轧带钢
氧化铁皮
表面缺陷
细条状缺陷
hot-rolled strip steel
oxide scale
surface defect
thin strip-shaped defect
