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通过热力学计算,得出了硅脱氧430不锈钢熔体Fe-Mg-Al-Si-O体系MgO.Al2O3、2MgO.SiO2、3Al2O3.2SiO2和2MgO.2Al2O3.5SiO2的平衡相图,分析了控制尖晶石夹杂物形成与转变的热力学条件。结果表明:1 873 K时,当钢中Al的质量分数在1×10-6以下,钢水中基本不形成镁铝尖晶石;随钢水中溶解铝含量的逐渐降低,由尖晶石转变为2MgO.SiO2所需的溶解氧质量分数逐渐提高。当钢水中溶解镁的质量分数在2×10-6,控制钢水中w(Al)<4×10-5、w(O)<8×10-6时,对于抑制不锈钢尖晶石夹杂物的形成有利。
By thermodynamic calculation, the equilibrium phase diagram of Fe-Mg-Al-Si-O system MgO.Al2O3, 2MgO.SiO2, 3Al2O3.2SiO2 and 2MgO.2Al2O3.5SiO2 for Si-deoxidized 430 stainless steel was obtained. Thermodynamic conditions for the formation and transformation of stone inclusions. The results show that when the mass fraction of Al in steel is less than 1 × 10-6 at 1 873 K, almost no magnesia-alumina spinel is formed in the molten steel. With the decreasing of the dissolved aluminum content in the molten steel, the spinel changes to 2MgO.SiO2 required dissolved oxygen mass fraction gradually increased. When the mass fraction of dissolved magnesium in molten steel is 2 × 10-6, w (Al) is less than 4 × 10-5 and w (0) is less than 8 × 10-6 in molten steel, the inhibition of stainless steel spinel inclusions Form a favorable.