连铸坯的液芯轧制

研究了连铸坯的液芯轧制，并结合日本川崎永岛厂的实例，证实了连铸坯液芯轧制的可行性，指出了钢锭和连铸坯液芯轧制的区别，及如何制造压应力状态，推导了坯壳应力与轧辊直径压下量，坯壳厚度的关系，并提出了用振摆式轧机实施连铸机液芯轧制的方案。     

连铸坯热送热装和直接轧制的技术经济效益

从量的概念介绍了连铸坯热送热装和直接轧制的技术经济效益,以及在我国发展此项重大工序节能技术所能带来的效益。     

NKK连铸坯热送轧制技术

据“铁钢”,1988;74(7):1235报道,近几年来,为了节能并缩短生产周期,实现了连铸坯热送热轧直接化的方案。日本钢管公司福山制铁所于1984年9月,在5号连铸机与第二热轧分厂之间建成了直送轧制系统,并已开始直送轧制。本文概括了日本福山制铁所的直送轧制工艺的有关技术以及今后的课题。1.设备概况     

连铸坯热装轧制探索

连铸坯热装轧制作为一项节约能源和提高生产率的工艺技术被各钢厂广泛采用。本文就三钢１３０ｍｍ×１３０ｍｍ×２８００ｍｍ连铸坯热装轧制作一些探索。     

连铸坯轧制钢轨低倍组织特征研究

本文主要对包钢连铸坯轧制钢轨低倍组织结构作了初步的讨论分析，并与模铸锭轧帛钢轨低倍组织结构进行了比较，此外还简要介绍了自生产以来，连铸坯轧制中易出现的有害缺陷。     

连铸坯直接热送轧制表面质量控制

1 前言 兴澄钢铁有限公司(前身江阴钢厂)于1997年11月新建成一条年产60万t钢,连铸坯60万t的短流程生产线,全套技术从德马克(DMG)引进,与炼钢匹配是一条年产60万t材的连轧线,去掉了中间开坯,一火成材。因此,对连铸坯表面和内部质量要求很高,为了获得高质量的连铸坯并达到     

连铸坯热送热装和热直接轧制新技术及其技术经济效益

本文叙述了连铸坯热送热装及热直接轧制国内外发展概况、技术概念、必备条件、技术经济效益，并针对我国钢铁工业情况，提出了若干建议。     

碳钢连铸凝固过程的微观模拟

通过一种简单的数学模型研究了连铸坯凝固过程中枝晶生长的重要微观结构参数.结合中碳钢连铸性能计算出凝固过程中枝晶生长的尖端半径、枝晶生长速率、二次枝晶臂间距等枝晶相关参数,并研究了拉速对上述微观结构参数的影响.分析了碳、硅、锰、磷和硫等重要元素的微观偏析程度随凝固进程与坯壳生长的变化规律.与前人经验模型的对比与验证表明本文模型预测结果合理.     

Effects of heavy reduction technology on internal quality of continuous casting bloom

Heavy reduction technology of the bloom is realised without modifying the hydraulic equipment if a crown roll is used. Experimental results of GCr15 showed that the ratio of reduction amount to broadening amount increased from 2.0 (flat roll reduction) to 4.4 (crown roll reduction), which indicated that reduction efficiency is significantly improved. It is evident that the enriched molten steel in the mushy zone will be squeezed out if the crown roll heavy reduction technology is adopted. Thus, centre segregation and V segregation is suppressed or even eliminated. The average centre carbon segregation index is reduced from 1.74 to 1.06, and negative segregation may occur. Meanwhile, the centre shrinkage cavity is clearly decreased and the centre porosity grade is remarkably reduced to 1.0. The calculation results of elastic–plastic FEM model showed that heavy reduction at the solidification end is very beneficial to improve the centre shrinkage cavity.     

重轨钢连铸技术的发展现状

简述近年来我国4家钢铁企业重轨产量情况,介绍在重轨钢连铸中遇到的主要质量问题以及相应采用的措施,分析我国各重轨生产企业连铸机装备和技术特点。     

高拉速下凝固进程的试验测量与模型预测

 根据京唐高拉速试验特点,结合板坯连铸机设备和洁净钢连铸工艺特点和要求,建立连铸板坯凝固传热模型并结合射钉法测量综合预测了1.9～2.4 m/min高拉速条件下铸坯的凝固坯壳厚度和凝固终点位置。综合研究表明,结合射钉试验和数值模拟能更精确跟踪铸坯的凝固进程,为高拉速试验提供准确的凝固信息,并能为评价连铸机综合冷却能力、优化二冷制度和轻压下工艺提供合理的参考信息。     

Coordinating optimisation of F-EMS and soft reduction during bloom continuous casting process for special steel

To control the halfway cracks and shrinkage cavities during bloom continuous casting (CC) process, final electromagnetic stirring (F-EMS) and soft reduction techniques have been coordinately optimised. The halfway crack and shrinkage cavity can be successfully controlled by adopting the CC technique parameters described as follows: (1) casting speed is 0.62 m min-1, (2) secondary cooling water ratio is 0.2?L?kg^?1, (3) reduction amount is 18?mm; (4) reduction region ranges from 19.9?m (location of M3 roller) to 25.4?m (location of M9 roller) distance from meniscus; and (5) corresponding distributions of reduction amount for each roller are 1, 1, 2, 3, 4, 4, and 3?mm along the casting direction. As compared to origin scheme for bearing steel, the difference between the maximum and minimum segregation degrees at the strand centre can be reduced from 0.35 to 0.09 under the optimal case.     

连铸坯粗轧热过程二维传热数学模型

根据某公司热轧厂铸坯粗轧热过程的工艺条件,建立了铸坯粗轧热过程二维传热数学模型,并利用现场实测数据对所建立的数学模型进行了对比分析计算。模型计算值和实测值的最大相对误差为3.1%,完全满足实际生产过程中计算机控制系统对数学模型计算精度的要求。证明所建模型是正确可靠的。所做工作可以作为计算机在线控制的理论基础。     

Microstructure,texture and precipitates of grain-oriented silicon steel produced by thin slab casting and rolling process

A grain-oriented silicon steel strip with AlN as main inhibitor was produced by thin slab casting and rolling (TSCR) process.The microstructure, texture and precipitates of the hot-rolled strip were investigated by use of optical microscope (OM), X-ray diffractometer, transmission electron micro-scope (TEM) and energy dispersive spectroscope (EDS).The result shows that the microstructure and texture exhibit a through-thickness gradient similar to that of the hot-rolled strip produced by con-ventional high-temperature slab-reheating process;the preferred orientation varies from{110}<001>in the surface layer to{001}<110> in the center layer, and the Goss texture with a maximum inten-sity mainly concentrates on the surface layer.In addition, some other texture components, for ex-ample rotated Goss texture, form in the 1/4 thickness layer, which are not observed in the hot-rolled strip produced by conventional high-temperature slab-reheating process.The precipitates in the hot-rolled strip are mainly (Mn,Cu)S and AlN compound particles with dimension of 100-200 nm, and the fine precipitates are significantly less than that in the hot-rolled strip produced by conven-tional high-temperature slab-reheating process.Moreover, the areal density of the fine precipitates in the center layer is more than that in the surface layer.     

连铸大方坯轻压下过程的变形行为

首先从理论上描述了轻压下过程铸坯的三维变形行为,并采用有限元法定量分析了轻压下工艺对铸坯变形行为的影响规律.结果表明:铸坯宽展变形和延展变形达到平衡后,随着压下量增加,铸坯延展率随压下量呈直线关系变化.在相同轻压下条件下,随铸坯长宽比和中心未凝固率的增加,铸坯宽展效率和延展效率下降,压下效率增加.     

连续铸钢结晶器钢水液位自动控制及其实践

介绍连续铸钢结晶器钢水液位自动控制技术的国内外状况，包括液位检测技术、控制算法和执行器等在实际生产过程中的应用情况及存在的问题。针对上述状况进行了评估并提出解决问题的建议。     

马氏体不锈钢方坯连铸工艺研究

由于马氏体不锈钢的物理特性,使得连铸过程中存在柱状晶发达、中心疏松、缩孔及表面凹陷严重等问题.针对上述情况,连铸过程中针对该钢种的凝同特点、高温物理特性等方面进行了研究,解决了马氏体不锈钢浇铸过程中的工艺问题,保证了产品的质量.