SiO₂-Al₂O₃-CaO-MgO系夹杂物低熔点区域优化及控制的热力学计算

来源期刊：钢铁2011年第1期

论文作者：张博 王福明 李长荣

文章页码：39 - 44

关键词：CaO-SiO₂-Al₂O₃-MgO系夹杂物； 低熔点区域； 60Si2CrA阀门弹簧钢； 热力学计算

Key words：CaO-Al₂O₃-SiO₂-MgO inclusion； low melting point area； 60Si2CrA valve spring； thermodynamic calculation

摘    要：为了预测CaO-Al₂O₃-SiO₂-MgO系夹杂物具有良好变形能力的成分控制范围,首次通过热力学软件Fact-Sage对CaO-Al₂O₃-SiO₂-MgO系液相投影图、低熔点区域大小进行了计算分析,并以阀门弹簧钢60Si2CrA为例,对CaO-Al₂O₃-SiO₂-MgO系低熔点夹杂物的生成条件进行了探讨。结果表明:MgO和Al₂O₃含量分别为15%和20%时,夹杂物的低熔点区域最大。若使60Si2CrA弹簧钢液中的夹杂物成分落在CaO-SiO₂-Al₂O₃-15%MgO系和CaO-SiO₂-20%Al₂O₃-MgO系的低熔点区域,同时保证[O]含量尽可能低,则钢液中[O]和[Al]质量分数应分别控制在(10~30)×10^-6、(10~45)×10^-6和(10~30)×10^-6、(15~40)×10^-6。

Abstract: In order to predict the composition range of CaO-Al₂O₃-SiO₂-MgO inclusion with good deformability,the liquidus projection and the low melting point area size of CaO-Al₂O₃-SiO₂-MgO system was first calculated and analyzed by thermodynamic software FactSage.Furthermore,the condition of forming CaO-Al₂O₃-SiO₂-MgO inclusions with low melting point was thermodynamically discussed in case of valve spring steel 60Si2CrA.The results show that the low melting area of CaO-Al₂O₃-SiO₂-MgO inclusion is the biggest when the content of MgO and Al₂O₃ is 15% and 20%,respectively.If the inclusions composition fell on the low melting point area in CaO-Al₂O₃-SiO₂-15%MgO system and CaO-Al₂O₃-SiO₂-15%MgO system for 60Si2CrA steel,respectively,and then it also guarantee that [O] content is as low as possible,while the [O] and content in molten steel is(10-30)×10^-6 and (10-45)×10^-6,(10-30)×10^-6 and(15-40)×10^-6,respectively.