Internal decarburization mechanism and control technology of RH treatment for ultra-low carbon steel
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摘要: 为了研究RH真空处理过程脱碳反应速率及其影响因素,并有效地控制超低碳钢在RH真空处理过程中碳含量的变化,根据热力学、动力学原理建立了RH真空处理脱碳数学模型,通过RH真空处理脱碳数学模型研究了内部脱碳反应深度和脱碳速率之间的关系.模型计算结果表明,反应深度的变化和内部脱碳的反应速率是相对应的,采取预真空操作,提升了反应深度,淡化了前期脱碳转折点的影响,加速了前期的脱碳反应,并在RH处理后期找到了内部脱碳向表面脱碳转变的时间临界点.Abstract: In order to study the reaction rate of RH vacuum decarburization and its influencing factors, and effectively control the change in carbon content of ultra-low carbon steel in the RH vacuum treatment process, a mathematical model of RH vacuum decarbnrization was established on the basis of the kinetic and thermodynamic theories. A relationship between the reaction depth of internal decarburization and the decarburization reaction rate was studied by the RH vacuum decarburization model. The calculated results of this model show that the change in reaction depth is corresponding to the decarbnrization reaction rate. Taking a pre-vacuum operation can increase the reaction depth, decrease the impact of the early decarbonization turning point and accelerate the decarburization reaction in the early stage. The critical point of time from internal to surface decarbonization is found out in the late of RH treatment.
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Keywords:
- steelmaking /
- low carbon steel /
- decarburization /
- mathematical models
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