论文部分内容阅读
采用热力学软件FactSage对CaO-Al2O3-SiO2-MgO四元系夹杂物的低熔点区域面积进行了分析计算,发现其低熔点区域可以根据碱度的不同分为两个区域,利用KTH模型对这两个低熔点区域内的硫容量进行了计算比较,并结合临氢钢12Cr2Mo1R对钢液成分及脱硫的要求,对其适用的低熔点区域进行了讨论.结果表明:如将夹杂物控制在碱度高的低熔点区域,则CaO的质量分数在30%左右,Al2O3在15%左右,MgO在10%左右,SiO2大于40%,且SiO2越多,低熔点区面积越大;如果将夹杂物成分控制在低碱度区域,则CaO在50%左右,Al2O3在45%左右,MgO的质量分数在5%左右,SiO2的质量分数小于5%.高碱度低熔点区的硫容量明显小于低碱度低熔点区,在两个低熔点区内,硫容量均随碱度的增加而增加,且钙铝比越大,硫容量随碱度增加的幅度越大;对于临氢钢12Cr2Mo1R来说,应将CaO-Al2O3-SiO2-MgO四元系夹杂物控制在高碱度低熔点区域,且碱度和钙铝比越大越好.
The low melting point area of CaO-Al2O3-SiO2-MgO quaternary inclusions was analyzed and calculated by using the thermodynamic software FactSage. It was found that the low melting point area could be divided into two areas according to the alkalinity. By KTH model, The results show that if the inclusions are controlled to basicity, the sulfur content in the low melting point region is calculated and compared with the low melting point region suitable for the composition and desulphurization of the liquid steel in the 12Cr2Mo1R steel. High melting point, the content of CaO is about 30%, the content of Al2O3 is about 15%, the content of MgO is about 10%, the content of SiO2 is more than 40%, and the more SiO2, the larger the area of low melting point. In the low alkalinity region, the content of CaO is about 50%, the content of Al2O3 is about 45%, the mass fraction of MgO is about 5% and the mass fraction of SiO2 is less than 5% In the low melting point zone, both the sulfur capacities increase with the increase of alkalinity, and the larger the ratio of calcium to aluminum is, the larger the sulfur capacity increases with alkalinity. For 12Cr2Mo1R hydrogen steel, CaO-Al2O3-SiO2-MgO quaternary inclusions should be controlled in the high alkalinity low melting point region, Alkalinity and calcium aluminum ratio is larger the better.