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LF精煉對CSP集裝箱鋼TO和夾雜物影響

Effect of LF refining on TO and inclusions of container steel in compact strip production process

  • 摘要: 為提高武鋼薄板坯連鑄連軋產線集裝箱鋼水潔凈度,通過工業試驗考察了LF精煉過程爐渣成分、軟吹氬以及鈣處理工藝對鋼中TO和夾雜物的影響.試驗結果表明,適當提高(CaO+MgO)/SiO2有利于降低鋼中TO,但同時要考慮(CaO+MgO)/Al2O3的比值,適當增加鈣處理前后軟吹氬時間可明顯提高鋼水潔凈度;將爐渣中(CaO+MgO)/SiO2和(CaO+MgO)/Al2O3控制在合適范圍不僅有利于提高鋼水潔凈度,而且有利于鋼中低熔點CaO-MgO-Al2O3系夾雜物的生成.根據相關熱力學數據給出了實際生產鋼中生成不同液態鋁酸鈣時Ca-Al平衡熱力學計算模型.

     

    Abstract: In order to improve the cleanliness of container steel for the compact strip production (CSP) production line of Wuhan Iron and Steel Corporation,the effect of slag compositions,argon blowing and calcium treatment on TO and inclusions was studied by industrial trials. The results show that increasing the ratio of (CaO + MgO)/SiO2 is beneficial to decreasing TOin molten steel., but the ratio of (CaO + MgO)/Al2O3 should be considered. The increase of argon blowing time before and after calcium treatment can improve the cleanliness of molten steel obviously. The suitable ratios of (CaO + MgO)/SiO2 and (CaO + MgO)/Al2O3 in the slag are not only beneficial to improving the cleanliness of molten steel but also forming the low melting temperature inclusions of CaO-MgOAl2O3 type. Based on thermodynamic data,a thermodynamic calculation model for the equilibrium ofCaandAlwas given when liquid calcium-aluminate formed in actual production.

     

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