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CSP低碳鋁鎮靜鋼水可澆性控制

Improvement of CSP castability in low carbon Al-killed steel

  • 摘要: 通過鋼液-夾雜物的熱力學基本理論,利用活度相互作用系數和Bjorkvall方法分別計算了CSP流程低碳鋁鎮靜鋼中鋼和夾雜物的成分,詳盡地分析了CaO-Al2O3二元系中中間相3CaO·Al2O3,CaO·Al2O3,液態12CaO·7Al2O3和CaS夾雜的熱力學性質,同時分析了鈣處理過程中生成液態鋁酸鈣夾雜物,避免CaS夾雜析出的條件.模型的結果與工廠試驗結果相符合.

     

    Abstract: The fundamental or common thermodynamical relations between calcium-treated aluminium-killed molten steel and non-metallic inclusions were discussed. The thermodynamic properties of low carbon Al-killed steel and inclusions in the CSP process were calculated using the interaction coefficients of activity and the Bjorkvall method respectively. A detailed analysis of the CaO·Al2O3 binary system established the modification of solid alumina inclusions via the following intermediate phases:3CaO· Al2O3, CaO· Al2O3, liquid phase 12CaO·7Al2O3 and CaS. The conditions of forming liquid calcium-aluminate inclusions and avoiding the formation of CaS in calciumtreated aluminium-killed molten steel were also discussed using these thermodynamic relations. The results are in good agreement with the plant data.

     

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