共查询到19条相似文献,搜索用时 119 毫秒
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平炉钢的热轧带钢进行冷轧时,轧制一道或二道后,经常产生表面缺陷。这种表面缺陷是表面鳞皮或泡痕。表面看来,似乎是由于被轧入的小块氧化铁皮所引起。已经确定,用同样方法生产的再加工热轧带钢,产生缺陷的可能性是各不相同的。冷轧带钢的 相似文献
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为了找出冷轧Q195窄带钢表面产生起皮、麻点等缺陷的原因,采用SEM和EDS方法对某厂生产的Q195冷轧带钢表面缺陷试样进行了分析,同时对Q195热轧带钢进行对比分析。结果表明,Q195冷轧带钢出现缺陷是由于铸坯中含有较多的夹杂物以及加热、除磷等因素导致的。结合生产实际,从冶炼、加热、除磷等方面提出了防范措施,对现场生产具有很大的指导作用。 相似文献
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《钢铁研究学报(英文版)》2011,(Z2):335-340
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. 相似文献
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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。 相似文献
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Conny Eriksson 《国际钢铁研究》2004,75(12):818-828
Surface defects in wire rod and bar rolling are common and well‐known to mill people. Nowadays, surface defects are not accepted on high‐alloyed steel wire rods. The steel making, casting and rolling processes give rise to defects. Also, the final handling of the wire and bar can destroy the surface. In this work, artificial V‐shaped cracks in the longitudinal direction were investigated for different reduction series. The false round‐oval series are known as a series for high quality steels and are usually better than square–oval series. Experiments confirmed that in the false round‐oval sequences a surface crack in the groove bottom may open up during rolling at the same time as its depth is reduced, which is a beneficial situation. Surface cracks found at 45° to the rolling direction, at groove “corners” and on free surfaces will be closed or reduced in depth. The closing of cracks is detrimental since the cracks usually hide rolled‐in oxides beneath the bar surface. The experiments showed that for the subsequent oval–false round sequence the visible crack at the groove bottom will be closed and become shallower. The cracks at 45° and on the free sides will also be closed, but deeper causing a serious surface defect. An FE‐analysis was carried out, explaining the experimental results. Flat oval grooves are better than round ovals and false rounds are superior to square for opening and decreasing the depth of a longitudinal crack. It is difficult to eliminate a surface defect constituting a closed crack. 相似文献
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浅析冷轧带钢在罩式炉退火中产生的粘接 总被引:3,自引:0,他引:3
经过罩式炉退火的冷轧带钢卷在开卷时有时会出现粘接这一表面缺陷。出现粘接的带钢卷层在平整开卷时将产生很高的开卷阻力 ,并在带钢表面造成带钢撕裂或折裂 ,同时伴随有开卷噪音。带钢粘接受许多操作因素的影响 ,其中有些因素又相互影响。对影响钢卷粘接的因素作了定性分析 相似文献
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大盘卷冷镦钢表面折叠、裂纹的判别及形成原因分析 总被引:1,自引:0,他引:1
表面折叠、裂纹是大盘卷冷镦钢的主要质量缺陷,也是造成制造紧固件过程中出现表面开裂的主要原因。通过对表面折叠、裂纹缺陷的外观特征及微观检验,得出了缺陷的判别方法。分析了其形成的原因,提出了相应的措施。 相似文献