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通过热力学分析结合现场试验,采用金相分析、扫描电镜、能谱分析等方法,研究了铝镇静钢中氧化物夹杂的变性处理工艺。热力学计算结果表明,当钢中的[Al]s质量分数为0.025%,钙处理时控制钢中钙质量分数高于22×10-6,硫质量分数低于0.008%时,可较容易地将Al2O3夹杂变性为低熔点的C12A7。对天津钢厂生产石油套管钢的LF精炼工艺进行了优化,通过强化钢水钙处理,使钢中钙含量有了显著提高,使夹杂物形态的控制大为改善。
Through the combination of thermodynamic analysis and field test, the modification process of oxide inclusions in Al-killed steel was studied by means of metallographic analysis, scanning electron microscopy and energy spectrum analysis. The results of thermodynamic calculation show that when the content of [Al] s in steel is 0.025%, the content of calcium in steel is more than 22 × 10-6 and the content of sulfur is less than 0.008% Al2O3 inclusions degeneration to low melting point C12A7. The LF refining process for producing oil casing steel in Tianjin Steel Works was optimized. The calcium content in steel was significantly enhanced by strengthening the calcium treatment of molten steel, so that the control of inclusion morphology was greatly improved.