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通过脱氧热力学计算410S铁素体不锈钢AOD还原后钢水中全氧质量分数,并对冶炼各工艺阶段所取钢样的全氧、夹杂物类型及形貌、渣样的化学成分进行检测,探究夹杂物的形成原因。结果表明,脱氧热力学计算的AOD还原后钢水中全氧质量分数跟检测值具有较好的一致性,随着还原硅质量分数的增加,钢水中全氧质量分数依次减小;随着冶炼过程的进行,钢液中全氧质量分数不断降低,夹杂物尺寸逐渐变小。AOD冶炼末期和LF冶炼末期夹杂物类型均主要为CaO-SiO_2-MgO-Al_2O_3,但成分不同,跟这两个阶段炉渣的化学成分接近。连铸中间包中夹杂物成分跟钢液的温度降低有关。
The oxygen content of 410S ferritic stainless steel after reduction by AOD was calculated by deoxidation thermodynamics. The chemical composition of all the oxygen, inclusions, The formation of things. The results show that the oxygen content in the molten steel after AOD reduction calculated by deoxidization thermodynamics is in good agreement with the measured value. With the increase of the mass fraction of reduced silicon, the total oxygen mass fraction in the molten steel decreases successively. With the smelting process , The total oxygen mass fraction in the molten steel continuously decreased, and the size of the inclusions gradually became smaller. The main types of inclusions in the late stage of AOD refining and the end of LF refining are mainly CaO-SiO 2 -MgO-Al 2 O 3, but the compositions are different, which is close to the chemical composition of the slag in these two stages. The composition of inclusions in the tundish is related to the decrease in the temperature of the molten steel.