低碳TWIP钢AOD氧化精炼过程数学模型

Mathematical model for the AOD oxidation refining process of low carbon TWIP steel

依据AOD精炼反应前期为供氧控速、后期为碳扩散控速的机理建立了低碳TWIP钢AOD氧化精炼过程数学模型.对8t AOD冶炼TWIP钢氧化过程钢液中碳、硅和锰含量变化进行了计算,碳含量变化与实测数据偏差小于5%.研究表明,8t AOD冶炼TWIP钢脱碳的临界碳含量处于0.33%~0.38%之间.

Based on the mechanism that the oxidation rate of carbon is primarily related to oxygen supply in the earlier stage and mass transfer of carbon in molten steel in the later stage,a mathematical model was proposed to describe the argon oxygen decarburization( AOD) oxidation refining process of low carbon twinning induced plasticity( TWIP) steel. The variations of C,Si and Mn contents in molten steel in an 8 t AOD converter during the oxidation refining process were analyzed by this model. The result shows that the error of the calculated carbon content is less than 5% compared with the measured values. It is also found that the critical carbon content of decarburization of the TWIP steel in the 8 t AOD converter is between 0. 33% and 0. 38%.