共查询到20条相似文献,搜索用时 98 毫秒
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采用金相显微镜和背散射电子衍射(EBSD)技术,从氧化皮结构出发,对低碳钢热轧板氧化皮的结构与热轧板酸洗效果之间的关系进行了研究。结果表明,低碳钢热轧板在卷取前期(温度在400~500℃)的氧化铁皮分为两层,即外层是Fe3O4,内层为FeO;在室温下放置两天以后的板,氧化皮中的FeO完全分解为Fe3O4和Fe,并且铁颗粒在原FeO的晶界富集。具有FeO和Fe3O4复合结构的氧化皮比Fe3O4单层氧化皮更易酸洗。 相似文献
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一、前言目前武钢生产的低碳钢以及低合金热轧板,经“米巴赫”(Miebach)焊机闪光焊拼卷后酸洗,最后经五机架连轧机进行冷轧,在连续轧制过程中,时常出现断带现象。产生断裂的部位包括基材和焊缝,尤其是焊缝部位的裂缝占很大比例。为了解决这个问题,我们着重对焊缝部位的断裂现象进行了研究。二、试验材料 1.试验材料试验钢种为AY1、AY2、A1F、B1F、08F、W08F、08AL、A1和AD2等。试验用料取自生产线上发生断裂的冷轧板、闪光焊接及酸洗后的热轧板。 2.试样制备 2.1将在现场取到的大块冷轧断带制成金相试样,并在邻近部位截取断口试样。 2.2将酸洗热轧板制成拉力、反复弯曲、 相似文献
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应用体视显微镜、扫描电镜及能谱仪对近期集中爆发的冷轧电镀锡板表面白色条状缺陷的宏、微观形貌特征和缺陷成分进行分析研究,并经现场调查及模拟试验,分析认为酸洗前热轧板表面被点状有机物保护,酸洗时无法去除该区域的氧化铁皮,经冷轧轧制后形成此缺陷。 相似文献
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《轧钢》2007,24(1)
伊朗MSC公司改造热轧板生产线最近,伊朗MSC公司投资1亿欧元对其热轧板厂进行技术改造,内容包括电炉改造、热轧板厂电气改造,新建1条处理能力为110万t/a的连续酸洗线和1个废酸循环处理线,新建1条年生产能力30万t的平整线。酸洗线能处理宽560~1680 mm、厚1·2~5·3 mm的热轧带钢,废酸经循环处理后,能使工厂实现废酸、废水的零排放,该部分的投资占总投资的50%以上。本刊摘自《Iron&Steel Technology》2006,(12)Scaw金属公司改造其棒材厂Scaw金属公司近期将对其年产40万t的棒材厂进行技术改造,主要包括:高速双通道棒材输送设备、分段剪和上… 相似文献
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介绍现代汽车用钢的现状和发展趋势,重点评述了优质深冲薄板钢、无间隙原子钢、优良成形性的铁素体不锈钢薄板、非调质钢,以及汽车用金属功能材料,包括磁性材料和形状记忆合金等的开发状况。 相似文献
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冷轧汽车钢板发展动态 总被引:1,自引:1,他引:0
叙述近年来国外汽车用冷轧钢板的发展态势,着重介绍深冲级冷轧钢板,高强度钢板和涂镀层表面处理钢板生产工艺和性能改善方面的作用,以及汽车工业对这些钢板性能要求和应用的变化情况。 相似文献
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介绍了国内外电镀锌系钢板的开发和发展状况,以及在汽车工业中的应用,并对国内汽车用电镀锌系钢板今后的开发和发展提出建议。 相似文献
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Mrio Pinto Abel D. Santos Pedro Teixeira P.J. Bolt 《Journal of Materials Processing Technology》2008,202(1-3):47-53
The traditional market of sheet metal parts is based in high production volumes normally greater than 10.000 parts by using high-speed presses and highly automated operations, being the tooling usually made from steel or cast iron, which ensures the needed robustness for such production volumes. Current trends in stamping industries can be characterized by the increasing demand for individualization of products which leads to a growing development towards an increasing number of product variants, lower production volumes and shorter innovation cycles. These trends have triggered research in the development of faster and cost-effective tool manufacturing techniques suitable for low production volumes, since high investments in steel tools can only be compensated by huge volume series of one and the same part during long life cycles. A promising approach for production of small series of complex sheet metal parts is the use of non-conventional tooling materials such as polymers, wood and low melting point metals. The usage of these alternative materials in tooling is still looked with some suspicion, due to the lack of know-how on its processing and also on its wear durability, influenced by the required product geometry, blank material and expected production volume.
In this paper a study on the use of non conventional materials for tooling, to be used for producing a complex sheet metal part, is performed. The evolution of tool wear, roughness and geometrical changes in punch and die radius were measured and its influence in the stamped part geometry evaluated, for an imposed production volume target of 500 parts. Also a comparative study of the tooling costs is presented in order to assess the aptitude and economical feasibility of the use of these tooling materials for low production series. 相似文献
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日本开发无铬表面处理钢板的进展 总被引:3,自引:0,他引:3
随着环保要求的日益严格,传统的含铬表面处理钢板的应用将受到限制,国内外钢铁公司纷纷开展无铬表面处理钢板的开发。为此翔实地介绍日本钢铁业在开发无铬表面处理钢板领域的进展。 相似文献
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Kazuhiro Ohara Masashi Tsugeno Hiroyuki Imanari Yasuyuki Sakiyama Kazutoshi Kitagoh Jun Yanagimoto 《CIRP Annals》2014,63(1):257-260
Reducing energy consumption and emissions are crucial environmental concerns. While industry requires high-quality sheet steel for forming, the production of this steel by the steel industry consumes huge amounts of electric energy and emits considerable CO2. Conventionally, hot rolling process parameters have been determined empirically to achieve the desired mechanical properties, with the quality of the hot-rolled products having priority over energy consumption. We have developed a novel optimization system that evaluates both energy consumption in the sheet manufacturing process and the mechanical properties of the hot-rolled products. This paper describes the optimization of hot rolling strategies based on the estimation of energy consumption and prediction of mechanical properties. 相似文献