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ARCELOR集团不仅使用RH而且还有真空槽脱气(VTD)来生产包装用或汽车用超低碳钢。根据不同工厂的不同设备的实际情况,工业生产研究中心(IORC:ex IRSID)开发了脱碳动力学模型。前几年这类模型被广泛应用于脱碳过程中调整生产控制条件。更进一步,为更好评估液态金属流动性对脱碳过程的影响,可以使用一种根据钢水流速和湍流来定性钢包流体动力学的流体分析软件与动力学模型相结合来进行分析,并从工业生产结构和生产条件方面出发来进行数学计算。计算结果表明,不论何种设备类型,超低碳钢在真空脱碳处理过程中碳浓度呈现不均匀性。最大的区别是在处理开始阶段可以达到80ppm,然后逐步降低。当标准处理时间15~20分钟之后,碳浓度的不均匀性仍然存在。根据搅拌和流场条件的不同,钢包中少碳区域和富碳区域最大差异可以达到5~10ppm。这种差异在RH中比VTD更为明显,且影响区域较大。但是,不论是RH还是VTD,在镇静3~4分钟之后,不均匀性完全消失,数据结果与现场实际测量结果保持一致。从化学角度分析钢水停留时间分布计算,对RH设备进行更精确的分析,可以大大改善数据结果,并能对RH生产过程给出更为详细充分的解释。
The ARCELOR Group uses not only RH but also vacuum tank degassing (VTD) to produce ultra-low carbon steel for packaging or automotive applications. According to the actual situation of different plants in different factories, industrial production research center (IORC: ex IRSID) developed a decarburization kinetic model. A few years ago these models were widely used in the process of decarburization to adjust production control conditions. Furthermore, to better evaluate the effect of liquid metal flow on decarburization, a fluid analysis software and kinetic model that characterizes the fluid dynamics of the ladle based on the flow rate and turbulence of the molten steel can be used for analysis. From the industrial Production structure and production conditions to carry out mathematical calculations. The calculation results show that the carbon concentration of the ultra-low carbon steels is not uniform during the vacuum decarburization process, regardless of the equipment type. The biggest difference is that it can reach 80ppm at the beginning of the treatment and then decrease gradually. When the standard processing time is 15 to 20 minutes, nonuniformity of carbon concentration still exists. Depending on the agitation and flow field conditions, the largest difference between the ladle carbon-rich region and the carbon-rich region can reach 5 to 10 ppm. This difference is more pronounced in RH than in VTD, and the area of influence is larger. However, both RH and VTD, after 3 to 4 minutes of sedation, the inhomogeneities completely disappeared, and the data results were consistent with the actual field measurements. Analyzing the distribution of residence time in molten steel from a chemical point of view, a more accurate analysis of RH equipment can greatly improve the data results and provide a more detailed explanation of the RH production process.