转炉-精炼-连铸过程钢中氧的控制

<title>ntrol of Oxygen Content in Steelmaking-Secondary Metallurgy-Continuous Casting

结合近年来的文献和笔者的研究工作,概要论述了转炉-精炼-连铸过程中钢洁净度(以总氧含量T[O]表示)的控制及夹杂物对产品质量的影响。提高钢的洁净度应从产生夹杂物的源头抓起,尽可能降低转炉终点氧含量。根据生产统计数据,建立了转炉终点氧预报模型。介绍了硅镇静钢、硅铝镇静钢、铝镇静钢三种脱氧模式及脱氧产物的控制方法。采用钢包精炼方法把夹杂物消灭在钢水进入结晶器之前是获得"干净"钢水的关键。介绍了RH、LF、中间包钢水总氧预报模型。介绍了在连铸过程中防止钢水再污染和进一步去除夹杂物的措施。

<abstract>sed on recent literature and research work of myself, the control of steel cleanliness in the process of converter-ladle refining-continuous casting and the influence of the inclusions on product quality were reviewed. The oxygen content before BOF tapping is the main source of inclusions, so the oxygen content at end-point of converter blowing must be reduced as much as possible. The BOF end-point oxygen content predicting model is established according to statistics of production data. Three patterns of deoxidation and controlling methods of deoxidation products for Si-killed steel, Si&Al-killed steel and Al-killed steel are introduced. The elimination of inclusions from molten steel before casting into mould using ladle refining operation and tundish metallurgy is the key practice to obtain clean steel. Predicting model of total oxygen content in RH, LF and tundish is introduced. The metallurgical measures preventing the re-pollution of clean molten steel and further elimination of inclusions during the process of continuous casting are also taken into account.