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对抚顺新钢铁公司顶吹转炉复合吹炼改造前后冶炼工艺效果的差异进行了对比研究,结果表明:顶底复合吹炼工艺在冶炼终点的碳、氧控制水平较好[终点碳含量为0.06%～0.10%时(质量分数,下同),碳氧积为0.0026～0.0029],终点炉渣组元结构组成方面较合理,终点钢水氮含量较低(约16×10-6)。采用复吹工艺后,转炉终点钢水成分和温度控制趋于稳定,炉后合金消耗降低,成品成分控制合格率提高。在此基础上对顶吹、复合吹炼工艺条件下铸坯、轧材内在质量进行了研究,结果表明,采用复吹工艺,铸坯和轧材内在质量有了明显的改善,夹杂物总量要比顶吹工艺的低。
The results show that the carbon and oxygen control of the top and bottom compound blowing process is good at the end of smelting process [the end point carbon content is 0.06% ~0.10% (mass fraction, the same below), and the carbon and oxygen product is 0.0026 ~ 0.0029]. The structural composition of the final slag is reasonable and the nitrogen content of the final molten steel is relatively low (about 16 × 10-6). After the blowing process is adopted, the molten steel composition and temperature control at the end of the converter tend to be stable, the consumption of the alloy after the furnace is reduced, and the passing rate of the finished product composition control is improved. On this basis, the internal quality of slab and rolled material under the conditions of top blowing and compound blowing was studied. The results show that the internal quality of slab and rolled material has been significantly improved by the compound blowing process. The total amount of inclusions Lower than the top blowing process.