共查询到20条相似文献,搜索用时 93 毫秒
1.
唐山不锈钢公司中间包镁质干式料工作衬在低温烘烤后经常出现包壁横裂现象,产生横裂的的中间包工作衬无法正常使用,严重影响唐山不锈钢公司的连铸生产。因此,对中间包镁质干式料工作衬横裂现象进行了分析,并提出了相应的改进措施。通过使用观察,改进效果显著,解决了唐山不锈钢公司中间包镁质干式料工作衬横裂的问题。 相似文献
2.
介绍了石钢炼钢厂电炉工序碱性干式工作衬中间包的使用情况,中问包受侵蚀均匀,抗渣性能好,扣包容易,永久层寿命大大提高。 相似文献
3.
4.
西林钢铁公司一炼钢厂现有2座15吨转炉,一台三机三流方坯连铸机在1996年投入使用。连铸投产初期几年连铸比仅为50%~60%,在当时产量情况下,连铸机一个班拉钢时间为3~4小时,中间包工作层为硅质绝热板,基本上可以满足生产使用。98年连铸比达100%,转炉扩容,2001年高炉扩容,转炉产量逐年增加。相应地,中间包拉钢时间延长到6~7.5小时,原来硅质板中间包工作衬已不适应,漏中包事故较以前增多,钢水经常侵蚀到黏土砖砌筑的永久层,造成翻包困难,中包成本上升。 相似文献
5.
研制的中间包镁质涂抹料粘附性好、寿命高、烘烤不炸裂、不倒塌,使用完毕后,工作衬与永久层自动分离、磕包容易,满足了浇注钢种要求。 相似文献
6.
7.
8.
9.
本文结合炼钢工艺的发展及耐火材料的技术进步,阐述了中间包永久衬、中间包工作衬及中间包陶瓷过渡器的发展和应用情况,指出了中间包内衬用耐火材料对提高浇注速度和质量的重要性。 相似文献
10.
介绍了连铸中间包使用镁质涂料工作衬的实践情况,认为中间包镁质涂料工作衬施工简便,可以延长中间包使用寿命,经济效益显著。 相似文献
11.
针对国内某厂60t中间包浇注低碳铝镇静钢的多次试验数据,从理论上建立了浇注过程中中间包钢水氧含量的预测模型,模型中综合考虑了钢包渣中FeO及MnO含量,耐火材料SiO2含量,钢包到中间包钢水吸氮量,浇注时间,拉速,铸坯断面积等因素的影响,并对改进中间包操作进行了讨论。 相似文献
12.
13.
14.
15.
Effect of holding time and surface cover in ladles on liquid steel flow in continuous casting tundishes 总被引:1,自引:0,他引:1
Mathematical modeling of fluid flow and heat transfer of melt in a typical two-strand slab caster tundish has been done for
a complete casting sequence. The complete casting sequence consists of 1 minute of tundish emptying period during the ladle
transfer operation followed by 1 minute of tundish filling period by the new ladle and pouring at the normal operating level
of the tundish for 46 minutes. The effect of varying ladle stream temperature conditions on the melt flow and heat transfer
in the continuous casting tundish has been studied. When the ladle stream temperature decreases appreciably over the casting
period, corresponding to heat loss of the melt in the ladle from the top free surface, the incoming melt temperature becomes
lower than that of the melt in the bulk of the tundish after about 30 minutes from the start of teeming. This results in melt
flow along the bottom of the tundish instead of the normal free surface directed flow. The ladle melt stream temperature shows
little variability when the ladle has an insulated top. Corresponding to this situation, the temperature of the incoming melt
remains higher than that of the melt in the bulk of the tundish and the normal free surface directed flow is maintained throughout
the casting period. The product cast under such condition is expected to have a uniformly low inclusion content. The heat
loss condition from the top of the ladle has been shown to be the dominant factor in determining fluid flow and heat-transfer
characteristics of the melt in the tundish rather than the holding time of the melt in the ladle.
Formerly Graduate Student, Department of Materials Science and Engineering, Ohio State University 相似文献
16.
17.
18.
19.
全球钢铁产品很大比例上是通过连铸工艺生产的,而中间包保护浇注是连铸生产高品质洁净钢的关键环节之一。长水口是连接于钢包和中间包之间的耐材质通道,长水口的发明和使用在连铸技术发展过程中起到了重要的作用,并与中间包的保护浇注效果有着紧密的联系,具体包括防止稳态和非稳态浇注过程中的二次氧化和来源于空气/渣/耐材/引流砂等的污染。本文基于中间包钢液污染的来源和形式,引申出了长水口在这些方面可以起到的潜在作用,并回顾了长水口在连铸发展早期的发明、工业实验效果和不断优化的历程。工业实践证实了长水口优良的保护浇注功能,但其实际效果与长水口的结构和操作工艺紧密相关。因此,分析了不同的长水口结构(包括工业化的长水口和一些新的设计理念)对保护浇注的影响,重点评述了喇叭型长水口在改善钢液洁净度和提高生产效率方面的优势。讨论了长水口的浸入深度和偏斜等操作工艺参数与保护浇注之间的关系。结合新时期炼钢?连铸的发展形势,指出了未来长水口结构功能一体化的发展方向,具体表现在长寿化、轻量化、多功能化和绿色化等方面。 相似文献
20.
Ken Morales-Higa R. I. L. Guthrie M. Isac R. D. Morales 《Metallurgical and Materials Transactions B》2013,44(1):63-79
The performance characteristics of a tundish, such as the flotation of inclusions and slag entrainment, are largely influenced by the fluid-flow phenomena. Physical modeling in water is widely used to understand the fluid flows in a tundish and as a tool to improve, control, and design procedures for high-quality steel processing operations. These approaches were used to study the performance of fluid flow for a new design of ladle shroud. The new design for a dissipative ladle shroud (DLS) was studied, using a one-third scale, delta shaped, four-strand tundish. The results were compared with those achieved with the conventional ladle shroud. Different cases have been analyzed, including a conventional ladle shroud (LS) with a bare tundish and a tundish furnished with an impact pad. Similarly, the new design of the shroud (DLS) was studied under equivalent conditions. The physical experiments included the use of particle image velocimetry (PIV) and conductivity tracer techniques. The PIV measured the instantaneous velocities at the outlet of the DLS and the LS at different flow rates, showing the detailed jetting characteristics of water leaving the two types of ladle shroud. Residence time distribution (RTD) curves were also obtained for the different flow arrangements previously mentioned, and the dispersion of a colored dye tracer was observed at different intervals of time during tundish operation and analyzed using the video visualization technique. 相似文献