共查询到19条相似文献,搜索用时 93 毫秒
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为了节约能源,不增加生产成本,使钢材的综合性能大幅度提高,同时结合济钢棒材生产线现有设备、生产节奏和技改资金情况,在现有的棒材连轧生产线上,经第一步(中、精轧机、冷却及自控系统等)改造后的生产证明,用普通碳锰钢,少用或完全不用微合金,通过细晶强化和相变强化生产Ⅱ级和Ⅲ级钢筋,达到降低成本,提高附加值目标,为全面实现超细晶螺纹钢生产作了必要准备。经第二步(粗轧机等)改造实施后,按超细晶工艺组织生产,用普通碳锰钢,少用或完全不用微合金生产Ⅲ级钢筋和Ⅳ级钢筋,全面实现超细晶螺纹钢生产。 相似文献
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安钢一轧厂为解决棒材包装松散等质量问题,采用棒材自动成型技术对棒材生产线的收集包装系统进行改造。改造后棒材包装质量大为提高,取得了显著效果。 相似文献
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为了优化现有棒材生产线产品结构,增强企业适应市场的能力,在某小型连续棒材生产线保留原有产品和产能的情况下,通过对部分设备和孔型系统的改造,增加了角钢和槽钢产品生产,具体介绍了确定新增型钢产品大纲、选择利用现有轧机、配置型钢孔型系统的方法,利旧的轧机主电机参数校核计算的方法,以及主要设备改造的方案。仅通过局部设备和生产工具的改造即可使得连续棒材生产线同时具备棒材和型钢产品的生产能力,为新建设和已建成的棒材生产线开拓了一条产品优化升级的新思路。目前,该结构优化改造项目已圆满完成并稳定运行,提高了企业的经济效益。 相似文献
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介绍了柳钢全连续棒材生产线的工艺、设备、控制系统的设计和性能特点,分析了从1999年底投产以来的生产情况及存在问题,对孔型系统、导卫系统、小规格单线产量低等问题进行了改造。在该生产线产能达到60万t后,通过时其进行高效化改造,并把推钢式加热炉改造为步进梁式加热炉,使综合生产能力提高了19.5%。对全连续棒材轧制技术在柳钢的应用以及技术创新点进行了总结。 相似文献
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随着宣钢75万t棒材生产线产量的不断上升,其辅助设备存在的设计缺陷逐渐暴露出来。分析了加热炉出口处的出炉剔废系统和收集区运输链电机减速机的电机主轴故障产生的原因,提出了具体改造措施。改造后消除了棒材生产过程中存在的不利因素,确保了生产的稳步进行,降低了设备的维护成本及维护强度。 相似文献
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Society demands high strength and environmental conscious steel and our solution is ultra fine grained steel without any rare earth alloy. We developed mathematical modelling for microstructure evolution and characterized rolling condition for ultra fine grained plain carbon steel in the tandem hot strip mill. We constructed a new tandem hot strip mill rolled at heavy reduction and low temperature in the last 3 stands in the finishing train. We produced ultra fine grained plain carbon strip with grain size of 3 microns. This steel has 30% improved strength and better formability compared to the conventional schedule rolling steel. 相似文献
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累积叠轧焊制备超细晶IF钢微观组织与力学性能 总被引:8,自引:0,他引:8
采用累积叠轧焊方法制备了超细晶IF钢,对其微观组织和力学性能进行了分析。实验结果表明,累积叠轧后IF钢的平均晶粒尺寸为700nm;抗拉强度为621.3MPa,达到冷轧IF钢抗拉强度的2.02倍,屈强比σ0.2/σb为0.81。在累积叠轧过程中产生的氧化物夹杂导致超细晶IF钢的脆化。 相似文献
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M. Preethi B. S. Murty S. Ganesh Sundara Raman R. Natarajan 《Transactions of the Indian Institute of Metals》2014,67(5):681-690
The present study is made to develop ultra fine grained microstructure in welded steel tubes, through multiple cold drawing passes followed by an annealing treatment. The average ferrite grain size is reduced from 16 to 1.9 μm. SAE 1019M steel grade used for a typical automotive driveline component is studied. Strains between 0.3 and 1.4 followed by annealing at 400, 450 and 500 °C are considered to optimize the combination of cold drawing strain and temperature required to produce ultra fine grained microstructure in steel tubes. At a strain value of 1.4 and annealing temperature, 500 °C, polygonal ferrite grains and fine carbide particles are obtained. This microstructure is found to be suitable owing to its combination of high strength and good ductility in steel tubes. Tensile strength as high as 1,061 MPa and 9 % elongation is obtained due to microstructural refinement. The strength is increased by 350 MPa compared to the strength of conventional cold-drawn welded tubes. 相似文献
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摘要:对粗晶201LN奥氏体不锈钢采用60%冷变形结合700℃退火120s工艺制备超细晶奥氏体不锈钢,研究晶粒细化对奥氏体不锈钢高温力学性能的影响。利用光学显微镜、扫描电子显微镜、透射电子显微镜、电子背散射衍射技术对粗晶和超细晶奥氏体钢进行了组织表征,并使用万能试验机测试20和650℃环境下力学性能。结果显示粗晶奥氏体不锈钢经过冷变形结合退火工艺处理,平均晶粒尺寸由18μm细化为0.9μm,屈服强度由383MPa提高到704MPa,而伸长率由63.8%下降到46.3%,表明晶粒细化能有效提高奥氏体不锈钢屈服强度的同时较小损害塑性,TEM证实其形变机制均为形变诱导马氏体和孪生协同作用。当温度由20℃提高到650℃时,粗晶奥氏体不锈钢屈服强度和伸长率分别下降到180MPa和28.1%,超细晶奥氏体不锈钢屈服强度和伸长率分别为384MPa和24.2%。这表明在650℃高温环境下细晶强化作用仍然有效,粗晶和超细晶奥氏体不锈钢也有较好的塑性,其形变机制分别变为位错滑移和位错滑移+层错+孪生。 相似文献
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Ultra‐fine grained ferrite steels have higher strength and better toughness than the normal ferrite steels because of their micrometer or sub‐micrometer sized grains. In this paper the ultra‐fine grained steel SS400 is welded by CO2 laser. The shape of weld, cooling rate of HAZ, width of HAZ, microstructures and mechanical properties of the joint are discussed. Experimental results indicate that laser beam welding can produce weld with a large ratio of depth to width. The cooling rate of HAZ of laser beam welding is fast, the growth of prior austenite grains of HAZ is limited, and the width of weld and HAZ is narrow. The microstructures of weld metal and coarse‐grained HAZ of laser beam welding mainly consist of BL + M (small amount). With proper laser power and welding speed, good comprehensive mechanical properties can be acquired. The toughness of weld metal and coarse‐grained HAZ are higher than that of base metal. There is no softened zone after laser beam welding. The tensile strength of a welded joint is higher than that of base metal. The welded joint has good bending ductility. 相似文献