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为探究降低顶渣氧化性对改善超低碳钢钢液洁净度的影响,在转炉终点至中间包过程中,在多位置取炉渣和钢水试样,分别进行炉渣氧化性、钢液成分和夹杂物分析.实验结果表明:转炉出钢后通过对顶渣改质,渣中T.Fe由转炉终点的19.18%降至RH进站时的4.68%,顶渣氧化性降低明显.渣中T.Fe降低导致钢中[O]的降低,T.Fe较低的炉次平均吹氧量较大,使得铝脱氧前钢中[O]较高.RH结束渣T.Fe与夹杂物数量呈线性关系,T.Fe越低夹杂物数量越少,同时RH结束后夹杂物数量与铝脱氧前钢中[O]无必然关系.顶渣(Ca O)/(Al2O3)会影响其吸收Al2O3夹杂物的能力,(Ca O)/(Al2O3)控制不合理的炉次,其夹杂物数量也较多.通过降低顶渣氧化性,热轧板卷缺陷率得到明显降低.
In order to explore the effect of reducing the top slag oxidizability on improving the cleanliness of the ultra-low carbon steel liquid steel, slag and molten steel samples were taken at multiple locations from the end of the converter to the tundish, respectively for the oxidation of the slag, the composition of the molten steel and inclusion The experimental results show that the tailing slag is modified after tapping, the T.Fe in the slag is reduced from 19.18% of the end point of the converter to 4.68% of that at RH pitting, and the oxidation property of the top slag is obviously decreased. The decrease of Fe leads to the decrease of [O] in steel, and the average oxygen blowing rate of furnace with lower T.Fe is larger, which leads to higher [O] in steel before deoxidation of aluminum. The lower the amount of T.Fe, the less the amount of inclusions, and the number of inclusions after RH has no relation with [O] in the steel prior to deoxidation of aluminum.CaO / Al2O3 will affect the amount of Al2O3 inclusions (CaO) / (Al2O3) control of unreasonable furnaces, the number of inclusions are also more by reducing the top slag oxidizability, hot-rolled coil defect rate was significantly reduced.