共查询到19条相似文献,搜索用时 93 毫秒
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连铸坯热装炉改善钢的组织性能鞠幼华鞍钢钢研所我国连铸工业的发展与国际发达国家有许多不同之处,随着连铸坯短流程直送热装工艺的推广应用与连铸连轧新工艺的开发,将形成连铸坯冷装、温装、热装、在线补热直接轧制和薄板坯连铸连轧等多种工艺。装炉坯温(表面形心温度... 相似文献
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本钢继薄板坯连铸连轧投产后,先后试制生产高强钢、硅钢、耐候钢、管线及石油套管、汽车大梁等钢种,并取得成功,其中部分钢种已达到批量生产能力。结合本钢炼钢厂的生产实践论述了目前在薄板铸机上进行的超低碳钢生产试制情况。 相似文献
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基于准稳态二冷凝固传热数学模型和高温弹塑性应力应变数学模型,开发了薄板坯连铸传热过程与应力状态仿真软件CISDI_HPSS FOR THIN SLAB R2009,其中详细考虑了二冷区存在的多种传热方式和铸坯宽度方向上喷淋冷却的非均匀性以及夹辊支承、钢水静压力、拉坯、矫直等因素对铸坯高温力学变形的影响,软件对凝固传热和应力应变的耦合计算功能强大,具有良好的通用性和适用性,其仿真结果可用于优化薄板坯连铸机的工艺和设备参数,为相关工艺技术的开发和铸机工程设计提供重要的理论支撑。 相似文献
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1我国的电炉钢发展为什么背离世界潮流电炉机厂主要以废钢作原料,故比传统的高炉、转炉组成的联合企业生产流程短,从而使造价低40%~50%,能耗低30%,成本低10%左右。故自80年代以来,电炉比一直呈上升趋势,特别是从1989年美国纽柯公司采用薄板坯连铸连轧生产薄板卷的工艺成功,使效益规模由原来的300-400万t/a下降到80~100万t/a,加上直接还原铁等优质原料代废钢后可生产石油管、深冲板等优质产品后进一步拓宽了产品市场,使电炉比继续呈上升趋势;我国在1993年前亦符合这一趋势,但以后则连年下滑,具体对照如表1。表1世界及主… 相似文献
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宝钢连铸中间包干燥装置蓄热技术开发应用 总被引:1,自引:0,他引:1
由于连铸中间包的形状和大小不同,连铸中间包烘烤装置的蓄热式技术改造需要采用合适的方法才能取得良好的效果.本文通过对宝钢1450连铸中间包干燥装置的改造实例,提出了一种适用的连铸中间包烘烤装置蓄热式系统技术,并分析了系统的结构原理和节能效果.这一技术具有推广应用的实际价值. 相似文献
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A.G. Gerber 《International Journal of Heat and Mass Transfer》2005,48(13):2722-2734
This article describes a CFD model to predict the heat and mass transfer in the region of the initial contact of a liquid metal supplied to a cooled moving substrate. The situation resembles closely the early conditions for solid phase surface formation in many continuous casting operations. For near-net-shape applications where surface finish is important, the article describes a modeling approach for incorporating the key elements of water side cooling, intervening moving substrate, active contact layer, and liquid metal with binary-alloy solidification behavior. These elements provide the necessary macroscale results for incorporating models of the microstructure development of the cast along the surface. For the present article the results are compared to experimental data derived from the continuous casting of Al-4.5 wt%Cu. 相似文献
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针对板坯表面裂纹和内部裂纹两大类质量缺陷,基于凝固传热仿真、应力应变计算及连铸相关冶金工艺理论分析,并结合浇铸异常事件专家知识库方法,开发了CISDI板坯质量在线诊断分析数学模型及其应用软件CISDI_SQDS ONLINE R2011,其中引入裂纹生成指数来作为质量评级的参考理论指标,并在其计算过程中耦合考虑了与浇铸冶金准则密切相关的质量损失因子和异常事件对应的调节因子,实现了理论解析与专家系统的有机结合,为板坯质量的预测和控制提供了重要的理论工具,以期在板坯连铸生产中得以有效的推广应用。 相似文献
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介绍了铜带水平连铸熔铅炉组配置要求,重点讨论了连铸保温炉的工艺特点及温度均匀性问题,并对紫铅连铸炉型进行了初步探讨。 相似文献
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A finite element computational methodology is presented for predicting the temperature distribution, fluid flow, and thermal stresses evolving in a solidifying ingot, which itself is growing in length, during the start-up phase of a continuous casting process, with a particular reference to aluminum casting. The approach is based on the coupling of a thermal and flow model with a stress model, The thermal flow model is developed using a deforming finite element method with an Eulerian-Lagrangian transformation to account for the fact that the ingot itself is also growing at a prescribed casting speed. The stress model is developed also by the finite element method, with mechanical deformations in the solidifying materials described by a hypoelastic-viscoplastic constitutive relation. The integrated model has been applied to study the dynamic development of temperature, flow, and stresses in the solidifying ingot during the start-up phase for continuous casting of aluminum. The results show that the fluid flow and temperature distribution experience a rapid change at the initial stage but that the change slows down later in the process as it approaches to the steady state. Computed results compare reasonably well with experimental measurements for temperature distributions in the ingot. It is found that the thermal stresses in general evolve from small to big in magnitude and from compressive to tensile in the solidifying ingot. The hoop stress is larger than other stress components, in particular in the outer surface region. The air gap formed between the ingot and the bottom block increases initially and decreases afterward as a result of stress relaxation. 相似文献