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超低碳鋼頂渣氧化性對鋼液潔凈度的影響

Influence of ladle slag oxidability on the cleanliness of ultra low carbon steel

  • 摘要: 為探究降低頂渣氧化性對改善超低碳鋼鋼液潔凈度的影響,在轉爐終點至中間包過程中,在多位置取爐渣和鋼水試樣,分別進行爐渣氧化性、鋼液成分和夾雜物分析.實驗結果表明:轉爐出鋼后通過對頂渣改質,渣中T.Fe由轉爐終點的19.18%降至RH進站時的4.68%,頂渣氧化性降低明顯.渣中T.Fe降低導致鋼中O的降低,T.Fe較低的爐次平均吹氧量較大,使得鋁脫氧前鋼中O較高.RH結束渣T.Fe與夾雜物數量呈線性關系,T.Fe越低夾雜物數量越少,同時RH結束后夾雜物數量與鋁脫氧前鋼中O無必然關系.頂渣(CaO)/(Al2O3)會影響其吸收Al2O3夾雜物的能力,(CaO)/(Al2O3)控制不合理的爐次,其夾雜物數量也較多.通過降低頂渣氧化性,熱軋板卷缺陷率得到明顯降低.

     

    Abstract: Slag oxidability, steel composition and inclusions were analyzed by slag sampling and steel sampling from the BOF endpoint to the tundish for studying the influence of ladle slag oxidability on the cleanliness of ultra low carbon steel. The results show that by ladle slag treatment after BOF tapping, T. Fe content in top slag decreases from 19.18% to 4.68% when getting in RH, indicating that the reduction of slag oxidability is obvious. The reduction of T. Fe content in slag leads to the reduction ofO content in steel. For some heats with low T. Fe content, the average oxygen-blowing amount is large, and then theO content before Al deoxidization is relatively high. The relationship between the T. Fe content of RH end slag and the number of inclusions is linear, but meanwhile there is no obvious relationship between the number of inclusions after RH and theO content before Al deoxidization. The (CaO)/(Al2O3) ratio of ladle slag influences the Al2O3 absorption ability. The number of inclusions will be large if the (CaO)/(Al2O3) ratio of the slag is not reasonable. The defects of hot rolled sheets significantly decline with the reduction of slag oxidability.

     

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