菜钢冶炼超低碳钢工艺的研究与优化

THE RESEARCH AND OPTIMIZATION OF ULTRA-LOW CARBON STEEL SMELTING TECHNOLOGY IN LAIWU STEEL

莱钢炼钢厂在冶炼深冲级超低碳钢时，为确保RH炉进站氧含量满足工艺生产，要求转炉终点氧控制较高，RH炉碳氧反应后钢中剩余的氧含量富裕量大，造成含铝类脱氧剂消耗明显增加，脱氧后铜中夹杂物含量也明显增加，钢水可浇性差，常出现水口结瘤现象；因转炉钢水氧含量高对转炉炉衬侵蚀也较为严重，造成耐材消耗较高；同时因连铸机全保护效果差，造成钢水二次氧化严重，进一步恶化钢水质量。为此，通过对现有的工艺、设备进行优化完善，并分工序制定合理的氧含量控制方案，最终在含铝类脱氧剂、钢铁料消耗以及铜水的可浇性方面均获得明显改善，取得良好的冶金效果。

In the smelting of deep drawing quality ultra-low carbon steel, in order to ensure oxygen content in RH furnace to meet production process, Laiwu steel mill required higher end-point oxygen content. However, the remaining oxygen content in steel was rich after carbon and oxygen reacting in RH furnace, which resulted in the containing aluminum deoxidizer consumption increasing significantly, the inclusion content in steel after deoxidizing also increasing significantly, molten steel pouring poor, often appearing the nozzle clogging phenomenon. Because of oxygen content in molten steel was high, the converter lining erosion is more serious, causing higher refractory material consumption. At the same time, as a result of poor full protection effect of continuous casting machine, secondary oxidation of molten steel was becoming serious, further deteriorating the quality of molten steel. Therefore, existing technology and equipment of Laiwu steel mill were optimized, furthermore reasonable scheme of oxygen content control was also made in the division of process. The containing aluminum deoxidizing agent, iron and steel material consumption and the pourability of molten steel were significantly improved, obtaining good metallurgical effect.