共查询到19条相似文献,搜索用时 78 毫秒
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利用数值模拟对宣钢十二机十二流连铸机中间包的三维流场、浓度场和温度场进行研究,优化出了最佳控流装置。应用结果显示,采用优化结构后的中间包,流场明显改善,各流的流动特性趋于一致,高温钢液对第6流塞棒的冲击减轻,各流最大温差由优化前的10 K降低为优化后的4 K。且连浇时间由优化前的20 h延长到26 h。 相似文献
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30t EBT电弧炉-LF-CC流程生产80Mn14钢的工艺实践 总被引:1,自引:0,他引:1
通过采用电弧炉出钢前在钢包中加入40%的锰铁,LF精炼前期调整成分,精炼中期和末期控制精炼渣碱度≥2.5,软吹氩搅拌,控制中间包钢水过热度≤35℃,连铸全程进行保护浇铸等工艺措施,贵阳特钢—炼钢厂成功进行了80Mn14钢(%:0.75~0.96C、13.00~15.50Mn、≤0.80Si、≤0.070P、≤0.030S)的30 t EBT AF-35 t LF-260mm×300mm连铸机流程生产,产品各项性能均满足标准要求。 相似文献
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钢厂使用原保护渣[/%:25.64CaO,22.72SiO2,5.69MgO,8.29Al2O3,11.87(Na2O+K2O),5.49CaF2,5.10BaO]生产的300mm×360 mm低碳钢连铸坯表面易产生网状裂纹。通过分析保护渣润滑性能与铸坯冶金质量之相关性和研究碱度、MgO和Al2O3对保护渣熔点的影响,CaF2和碱土金属化合物含量对保护渣粘度影响,优化了保护渣的成分[/%:22.06CaO,23.63SiO2,4.76MgO,8.29Al2O3,11.90(Na2O+K2O),2.32CaF2,4.18BaO],应用结果表明,使保护渣液层的厚度由原保护渣的6~7.5 mm提高到7~10 mm,完全消除了连铸坯的网状裂纹。 相似文献
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介绍了天铁集团炼钢厂舻板坯连铸机中间包快换工艺实践,对快换中包的准备、中间包和浸入式水口的烘烤、钢水温度条件和操作过程等重要环节做了详细阐述,并对快换中包技术实施前后的技术指标进行了对比。采用快换工艺后,连浇炉数由快换前的20炉,次提高到80炉/次以上,换包成功率达到97.12%,减少了铸机停机次数,提高了铸机产能。 相似文献
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It is very important to understand the underlying physical phenomena at the steel/slag interface in a continuous casting tundish in order to control reoxidation and deoxidation phenomena that can occur. Aiming to investigate probable sources of exogenous inclusions originating from the covering slag, an existing mathematical model of the tundish was augmented to include key physical parameters needed for the prediction of the physical behaviour of steel/slag mixing phenomena. Results showed a recirculation flow in the inlet region to be responsible for both the entrainment of steel drops into the slag and slag fragments into the steel. The highest concentration of slag in the steel was found to be in the area behind the inlet where slag fragment sizes are smaller due to a high degree of turbulent energy dissipation. Likewise, higher concentrations of steel in the slag, consisting of smaller steel droplets, were only found in the inlet region and along the walls. The results indicate that only small slag fragments of approximately 10‐50 microns from the covering slag reach the outlet. 相似文献
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消除汇流旋涡是防下渣技术开发的首要目标。已有的浇注过程防下渣方法大体可分为3类,即上躲、下藏与抑制。看来抑制法最为积极、有效,特别是用于中间包的名种控流、分渣双功能装置具有显著的综合优势;这类装置的逐步完善与普及,似乎是今后提高连铸水主要技术走向之一。 相似文献
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通过采用水模拟和数值模拟分别对中间包不同结构进行全因素试验,研究了双挡坝结构对钢液流动行为的影响,着重探讨了不同类型的双挡坝中间包内钢液的流动状态和速度分布。结果表明:低坝应设置在高坝后,顶端钢液流速将减小29%,降低浇注末期发生卷渣的概率;低坝应与高坝流钢孔同高,钢液的平均停留时间可达到最大稳定值;高低坝距离差为40~160mm时,流体流动状态较稳定,低坝后无漩涡产生。分析认为:中间包入口区和出口附近均为强湍流状态,其他区域均为过渡流状态,入口区利于夹杂物的碰撞长大,应至少保证该区域长度大于中间包长度的1/4,出口区强湍流易产生大夹杂物导致水口堵塞,应控制在出水口附近0.25m的区域内。 相似文献
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Liangcai Zhong Liying Li Bao Wang Maofang Jiang Lixing Zhu Li Zhang Rongrong Chen 《国际钢铁研究》2006,77(2):103-106
Fluid flow characteristics in a two‐strand slab tundish with Ar bubbling curtain were studied in water modelling experiments. It was found that the Ar bubbling curtain can greatly improve the flow characteristics in the tundish with a weir, a dam and a turbulence inhibitor. It dramatically increased the peak concentration time and plug volume and greatly decreased the dead volume, but hardly influenced the minimum residence time. Therefore, the fluid flow characteristics in a tundish with Ar bubbling curtain were favourable to the flotation and separation of inclusions from molten steel. The flow characteristics with low gas flow rate and short distance of the Ar bubbling curtain from the tundish outlet were better than those with high gas flow rate and large distance of the curtain from the outlet. 相似文献