材料期刊网

由250 t转炉冶炼吹氩钢的生产数据分析,发现转炉脱氧工艺对脱氧铝消耗的影响大.出钢全脱氧工艺比半脱氧工艺的脱氧铝单耗高0.28 kg/t、脱氧铝利用率低8.3%;随转炉温度的上升或氧质量分数增加,脱氧铝单耗逐步增加,同时,转炉温度的上升会引起氧质量分数的增加.通过对SPHC板坯在两种脱氧工艺下的夹杂物分析,发现:宏观上两种脱氧工艺的全氧控制水平相当,约为0.0020%;半脱氧工艺的氮质量分数为0.0020%,全脱氧工艺时为0.0025%.微观上,夹杂物主要为Al2O3、Al2O3-MnS、氧化物和MnS/MnS-CuxS;全脱氧与半脱氧工艺相比,Al2O3夹杂物平均尺寸小0.6μm、Al2O3夹杂物比例低约25%、Al2O3-MnS夹杂物比例高约20%、硫化物比例低约5%.Al2O3夹杂物尺寸的减小易于Al2O3-MnS夹杂物的生成.

Through the production data of ladle argon stirring steel smelting in 250 t converter,it was found that deoxidi-zation technology during the tapping process had significantly affected the deoxidization consumption. Compared with the incomplete-deoxidization technology during the tapping process,the unit aluminum consumption of the complete-de-oxidization technology was about 0.28 kg/t higher,but the utilization of aluminum deoxidization was about 8.3%lower. The unit aluminum consumption of deoxidization increased gradually with the increase of converter end-point tempera-ture and dissolved oxygen content. Meanwhile the increase of converter end-point temperature would promote the in-crease of dissolved oxygen content. Through the inclusion analysis of SPHC slabs in the two deoxidization technologies, it was found that the total oxygen contents in slabs were equivalent about 0.0020%in both deoxidization technologies at the macro aspect,the nitrogen content was about 0.0020%in incomplete-deoxidization technology,whereas the nitrogen content was about 0.0025%in complete-deoxidization technology. The main inclusions in slabs included Al2O3,Al2O3-MnS,Oxide and MnS/MnS-CuxS at micro aspect. Compared with incomplete-deoxidization technology,the average size of Al2O3 inclusion of complete-deoxidization technology decreased about 0.6μm,the proportion of Al2O3 inclusion and sulfide inclusion decreased about 25%and 5%respectively,and the proportion of Al2O3-MnS inclusions increased about 20%. The decrease of Al2O3 inclusion size was available to formation of Al2O3-MnS inclusion.