780MPa级双相钢条状色差缺陷成因及改善措施

发布时间：2018-02-07 16:27

本文关键词： 双相钢条状色差缺陷成因分析改善措施　出处：《钢铁》2017年01期 　论文类型：期刊论文

【摘要】：针对780 MPa级双相钢表面存在严重的条状色差缺陷,从微观特征方面进行系统研究。采用SEM及EPMA分析手段研究缺陷表面情况,结果表明,缺陷处微观形貌呈粗糙破碎状,破碎的密集程度和缺陷的严重程度正相关;能谱和电子探针证明,破碎处只存在轻微氧化。应用辉光手段分析表层富集情况,色差严重程度与硅、锰等元素富集峰值距表层深度密切相关,结合热轧截面分析富集现象在热轧以橄榄石相的形式存在,宏观表现为条状红铁皮,该铁皮经过酸洗后难以除尽,在后续冷轧时不同区域表层元素富集深度及破碎密集程度存在差异,表现为连退板表面的条状色差缺陷。在此研究基础上优化热轧和冷轧生产控制方案,最终有效降低或消除了连退板表面条状色差缺陷。
[Abstract]:In view of the serious stripe color difference defects on the surface of 780 MPa grade dual phase steel, the microcosmic characteristics of the defects were studied systematically. The results of SEM and EPMA analysis showed that the microstructure of the defects was rough and broken. The intensity of fragmentation is positively correlated with the severity of defects. The results of energy spectrum and electron microprobe show that there is only slight oxidation in the broken area. The enrichment of the surface layer is analyzed by means of glow light, and the severity of color difference is related to the degree of silicon, The enrichment peak value of manganese and other elements is closely related to the depth of the surface layer. Combined with the analysis of hot rolling section, the enrichment phenomenon exists in the form of olivine phase in hot rolling. The enrichment depth and crushing density of surface elements in different regions are different in the following cold rolling process, which is shown as the strip color difference defect on the surface of continuous strip. Based on the research, the production control scheme of hot rolling and cold rolling is optimized. Finally, the defect of stripe color aberration on the surface of the continuous return plate is reduced or eliminated effectively.
【作者单位】：首钢技术研究院薄板所;绿色可循环钢铁流程北京市重点实验室;首钢京唐公司冷轧厂;
【分类号】：TG335;TG142.1

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