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首页> 外文期刊>ISIJ international >An Improved Model of Cored Wire Injection in Steel Melts
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An Improved Model of Cored Wire Injection in Steel Melts

机译：钢水包芯线注入的改进模型

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Mathematical models for tracking the melting of cored wire during its injection into the steel bath have been developed in the past though important aspects of the formulations have not been discussed in sufficient detail. As a result, it is difficult to use the results of these models to derive benefits for a specific steel melting shop. A general purpose mathematical model has been developed at R&D, Tata Steel, using the finite difference approach with a fully implicit scheme to simulate the process of cored wire injection taking into account the different operating practices encountered in the steel shop. Numerical simulation of this kind of problem, involving moving boundary, typically suffers from the limitation that the progressive solidification of frozen layers that takes place is not made part of the thermal balance till it attains the size of a full node and thus the heat gained or lost by this "partial node" is not accounted for till such time. An alternative numerical formulation has been developed to rectify this. Owing to the difficulty in making a direct validation, this model has been verified through a novel approach. This work suggests that the use of different wire dimensions (13-18 mm diameter and 0.4-0.6 mm casing), depending on the steel grades to be processed, is necessary in order to extract the maximum benefit.
机译：过去已经开发了用于跟踪芯线注入钢水浴过程中熔化情况的数学模型，但尚未对配方的重要方面进行足够详细的讨论。结果，很难使用这些模型的结果来为特定的炼钢厂获得收益。塔塔钢铁公司已经在研发中开发了通用数学模型，它使用有限差分法和完全隐式方案，考虑到钢厂遇到的不同操作实践，来模拟芯线注入过程。这种涉及运动边界的问题的数值模拟通常受到以下限制：发生的冻结层的逐步凝固直到达到完整节点的大小才成为热平衡的一部分，因此获得的热量或直到这样的时间，这个“部分节点”的丢失才被考虑。已经开发出替代的数值公式来纠正这一问题。由于难以进行直接验证，因此该模型已通过一种新颖的方法进行了验证。这项工作表明，为了获得最大的利益，有必要根据要加工的钢种使用不同尺寸的线材（直径13-18 mm，外壳0.4-0.6 mm）。

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