Abstract: In present paper，the control technology of aluminum content and inclusion composition was analyzed for high-silicon and aluminum-controlled steel by technological test. The results showed that content of Al in steel can be controlled within 0.0040% by using low basicity slag with alkalinity below 1.5，while the Al content is higher than 0.006% by using high basicity slag with basicity 2.5 - 3.5. The decrease of Al₂O₃ content in slag is beneficial to decrease the amount of Al increase in molten steel.The oxide inclusion component in low basicity slag steel is SiO₂-MnO-Al₂O₃-MgO-CaO series ， which achieves the control of inclusion plasticization. The oxide inclusion component in high basicity slag steel is Al₂O₃-SiO₂-MgO-CaO series with high Al₂O₃ content， and the plastic deformation ability of the inclusion material is insufficient. High clean steel with oxygen content less than 0.001 2% and fine inclusions can be obtained after RH control processing， although deoxygenation effect of the steel with low basicity slag is poor in the refining process.

Key words: Slag Basicity, Aluminum Content, Composition of Inclusions, Plastic Inclusions

摘要： 通过工业试验研究了高硅控铝钢中Al含量、非金属夹杂物化学成分控制工艺，结果表明，采用碱度在1.5以下的低碱度渣系可将钢中w［Al］控制在0.004%以内，采用碱度2.5～3.5的高碱度渣系钢液w［Al］＞0.006%。渣中Al₂O₃含量降低有利于抑制冶炼过程钢液增Al量。低碱度渣系钢中氧化物夹杂物成分为SiO₂-MnO-Al₂O₃-MgO-CaO系，达到夹杂物塑性化的控制目的。高碱度渣系钢中氧化物夹杂成分为Al₂O₃含量较高的Al₂O₃-SiO₂-MgO-CaO系，夹杂物塑性变形能力不足。虽然低碱度渣系在LF精炼过程脱氧能力不足，但经过RH真空处理后，仍然能得到w［O］＜0.001 2%、夹杂物尺寸细小的高洁净度钢。

关键词: 炉渣碱度, Al含量, 夹杂物成分, 塑性夹杂