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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。
Ultra-low carbon steels produced in a hot rolling mill often show two kinds of defects, strip-like and sand-like. Through the analysis of two typical defects, such as EPMA, SEM and EDS, combined with the situation of the rolling process in the field, the formation causes of these two kinds of defects were comprehensively analyzed. The analysis results show that no oxidation dots are found near the two defects, and defects are formed during the rolling process. Sliver-like defects are due to Mn element enrichment in the scale, so that the interface between the oxide scale and the substrate uneven, iron oxide tablets have a “pinning ” role; desquamation of the oxide scale is difficult to cause when the descaling The residual iron oxide scale is formed by pressing in the subsequent rolling process. Sandy flaw is due to F1 ~ F3 work roll surface oxide film flaking, so that the roller surface uneven in the follow-up rack rolling process rolled into the strip surface, resulting in three times into the iron oxide skin. The corresponding prevention and cure measures are put forward according to the causes of the two defects.