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通过热力学与动力学的分析阐明了 CaC_2—CaF_2熔剂对高锰钢喷吹还原脱磷时温度对脱磷效果起决定性的影响。当喷吹时钢液温度低于钙的沸点(1490℃)、高于CaC_2分解温度时,分解出来的Ca是液态:当喷吹时钢液温度高于试验条件下Ca的实际沸点时,分解出来的Ca呈气态。根据液态Ca与气态Ca还原脱磷时AK值的比较,证明液态Ca的脱磷能力大于气态Ca。溶解在钢液中的Ca数量有限,对脱磷不起主要作用。由此讨论了含碳高锰、高铬铁熔体及低碳不锈钢用CaC_2(Ca)-CaF_2熔剂喷吹还原脱磷时为获得良好脱磷效果的合适温度要求。
Through the analysis of thermodynamics and kinetics, the effect of CaC_2-CaF_2 flux on the dephosphorization effect of high-manganese steel during injection reduction dephosphorization was clarified. When blowing molten steel temperature below the boiling point of calcium (1490 ℃), higher than the decomposition temperature of CaC_2, the decomposition of Ca is liquid: when the molten steel injection temperature is higher than the actual boiling point under the conditions of Ca, decomposition The Ca coming out is in a gaseous state. According to the comparison of the AK value of liquid Ca and gaseous Ca in dephosphorization, it is proved that the dephosphorization ability of liquid Ca is larger than that of gaseous Ca. The amount of Ca dissolved in molten steel is limited and does not play a major role in dephosphorization. This paper discussed the suitable temperature requirement for obtaining good dephosphorization effect when reducing and dephosphorizing CaC_2 (Ca) -CaF_2 flux containing carbon and high manganese ferrochromium and low carbon stainless steel.