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控制冷却在板带材开发生产中的应用 总被引:3,自引:0,他引:3
概述了快速冷却及直接淬火在提高板带材性能及钢种开发方面的发展应用情况,并介绍了热轧带钢的新型控制冷却技术--超快速冷却(UFC).目前,UFC的冷却速率已超过300 ℃/s.UFC技术能明显提高带钢的强度和韧性、改善材质性能.还描述了UFC装置的应用实例及在开发超级钢、多相高强钢、相变诱导塑性钢等高附加值钢铁材料方面的应用潜力.随着先进钢铁材料开发的需要,新的控制冷却技术已由传统的对轧后开冷、终冷温度的控制向基于连续冷却转变CCT曲线的相变要求而对板带整个冷却过程的微观组织相变控制方向发展. 相似文献
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层流冷却技术在热连轧板带生产中的应用实践 总被引:2,自引:0,他引:2
介绍对层流冷却自动控制系统的改进,采用经验模型,设计出各种轧制条件、各钢种材质和各种产品规格的层流冷却方式和层流出口控制目标温度,较好地控制产品轧后冷却速度和卷取温度,使板带获得良好的金相组织和力学性能,减少了产品性能波动,提高产品性能合格率。 相似文献
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利用超快速冷却装置,通过控制轧后冷却路径,对某中碳钢的显微组织和力学性能进行了系统的研究.结果表明:超快速冷却可以抑制先共析铁索体的生成,破坏原有先共析铁素体的网状分布;超快速冷却显著缩小了珠光体的片层间距;随着超快速冷却后温度的降低,实验钢的强度和室温冲击韧性同时得到了提高.高温终轧+超快速冷却工艺可以使中碳钢获得良好的力学性能,避免了低温轧制带来的轧机负荷大的弊端,提高了轧制节奏. 相似文献
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阐述了轧材超快速冷却机制,利用东北大学试验装置对H型钢进行了超快速冷却试验研究,重点分析了莱钢Q235B,Q345B钢种轧后不同冷却速度、不同冷却方式对轧材组织和性能影响规律。试验表明:使用单段式冷却,冷速达到444.4℃/s时,屈服强度可提高205MPa;使用两段式冷却,一次冷却和二次冷却的冷速分别为385和297℃/s时,屈服强度可提高230MPa。2种冷却方式均能大幅度提高轧材强度,两段式冷却效果明显高于单段式冷却,为实现低成本生产H型钢及生产更高级别高强钢提供了技术支持。 相似文献
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《钢铁研究学报(英文版)》2011,(Z1):576-580
Ultra Fast Cooling is a new technology which used to control the hot-rolling strip cooling in recent years on the international developed.It can achieve fast and accurate temperature control in the hot-rolled strip production process to obtain corresponding transformation microstructure and ideal mechanical properties.This article describes the technical principle and layout of ultra fast cooling in hot-rolled as well as cooling features.Analysis the effect of front ultra fast cooling technology in C-Mn steel and obtained consequent on the industrial produced low-cost Q345 hot rolled steel in Panzhihua Iron and Steel. 相似文献
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热轧带钢新一代TMCP技术以超快速冷却为核心,通过冷却系统从空冷至超快冷的无级调控,利用广阔 的冷速范围及精准的温度控制,实现对带钢轧后冷却路径进行灵活的控制。有利于细晶强化、析出强化、固溶强 化、位错强化、相变强化的最佳匹配,从而使得热轧带钢产品获得优良的综合性能。新一代TMCP工艺技术具备低 成本、高效率、高均匀性、高控制精度等特征,是轧制工艺发展的重要领域之一。随着人们对带钢产品性能要求的 不断提高以及资源的日益枯竭,以超快速冷却为核心的热轧带钢新一代TMCP技术具有广阔的发展前景。 相似文献
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YE Xiaoyu ZUO Jun ZHANG Kaihua PanGang Group Research Institute Co. Ltd. Panzhihua Chengdu Sichuan China 《Baosteel Technical Research》2010,(Z1)
Ultra fast cooling is a new technology which used to control the hot-rolling strip cooling in recent years on the international developed.If suitably cooperated with a number of other new controlled rolling technologies,can achieve fast and accurate temperature control in the hot-rolled strip production process to obtain corresponding transformation microstructure and ideal mechanical properties.This article describes the technical principle and layout of ultra fast cooling in hot-rolled as well as appli... 相似文献
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介绍了620 mm生产工艺流程及超快冷工艺设备.使用超快冷后,通过控制冷却,Q235板坯轧制可以达到Q345B性能,带钢冷却能力可达到230℃,通条温度偏差控制在±15℃以内,可以满足部分钢种使用要求,同时使用超快冷后,带钢表面质量较好. 相似文献
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The improvement of hole-expansion properties for medium carbon steels by ultra fast cooling (UFC) after hot strip rolling was investigated. It was found that finely dispersed spherical cementite could be formed after ultra fast cooling, coiling and annealing treatment. Tensile strength of the steel after annealing was measured to be about 440 MPa. During hole-expansion test, cracks were observed in the edge region around the punched hole because necking or cracking took place when tangential elongation exceeded the forming limit. Cracks were mainly formed by the coalescence of micro-voids. Fine and homogeneous microstructure comprised of ferrite and spheroidized cementite could increase elongation values of the tested sheets by suppressing the combination of the adjacent micro-voids, resulting in the improved hole-expansion property. 相似文献
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By measuring the expansion curves of a C-Mn steel at different cooling rates by using an MMS-300 thermo- mechanical simulator, continuous cooling transformation curves were obtained. The new process "ultra fast cooling+ laminar cooling" was simulated and the effects of ultra fast cooling ending temperature on microstructure had also been investigated. The hot rolling experiment was done by adopting "high temperature rolling-[-forepart ultra fast cooling" technologies at laboratory scale. The results revealed that ultra fast cooling can delay the decrease of disloca- tion density and refine ferrite grains. Diversity control of the microstructure and phase transformation strengthening can be realized by changing the ultra fast cooling ending temperature. With the decrease of ultra fast cooling ending temperature, the strength and toughness increase, but plasticity does not decrease obviously. The new technique can improve the yield strength by over 50 MPa. Therefore, the upgrade of mechanical properties of C-Mn steel can be realized by using "high temperature rolling+ ultra fast cooling+laminar cooling" technique. Compared with "low temperature rolling with large deformation degree" technique, this new technology can decrease the roiling force and in- crease the production efficiency. 相似文献
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