氧化性炉渣对IF钢洁净度的影响  

Effect of oxidizing slag on the cleanliness of IF steel

作　　者：索金亮 王新华[1] 李林平[1] 黄福祥[1] 单庆林 邓小旋[3] 

机构地区：[1]北京科技大学冶金与生态工程学院,北京100083 [2]首钢京唐钢铁联合有限公司炼钢部,河北唐山063200 [3]首钢技术研究院薄板所,北京100043

出　　处：《炼钢》2016年第6期62-67,78,共7页Steelmaking

摘　　要：针对KR→BOF→RH→CC流程生产IF钢,在转炉出钢后加入不同量的改质剂进行顶渣改质处理。比较了各炉次顶渣改质效果,对RH处理过程中钢液成分和夹杂物形貌、成分、尺寸、数量的变化进行系统研究;对正常浇铸铸坯内弧表层的总氧与夹杂物的特征进行了对比分析。结果表明：使用铝质改质剂降低炉渣氧化性,必须加入足量石灰以保证顶渣吸收Al2O3能力;提高改质剂加入量,RH进站炉渣w（FeO）从13%~16%降至0.77%,钢液w（Als）损失速率减小30%~40%,RH结束时钢液w（T.O）〈20×10-6,铸坯表层夹杂物数量密度从5.66个/cm2降至2.96个/cm2,IF钢洁净度显著提高。Interstitial-free（IF）steel was produced by KR→BOF→RH→CC process.Different amounts modifier were added to ladle slag after tapping.The effect of top slag conditioning was compared.The composition of molten steel and the morphology,composition,size,number of inclusions during RH refining were studied.In addition,total oxygen and the characteristic of inclusions in the surface layer of continuously-cast slab were analyzed.The results show that enough lime must be added to top slag to ensure the Al2O3 absorption capacity by using Al-based modifier.The loss rate of soluble aluminum in steel declines 30%-40%and the total oxygen at the end of RH refining is below 20×10-6 when the mass fraction of FeO in slag decreases from 13%-16%to 0.77%,then the change of inclusion number in slab is significant from 5.66cm-2 to 2.96cm-2.

关 键 词：IF钢 氧化性炉渣 夹杂物 洁净度 

分 类 号：TF713.3[冶金工程—钢铁冶金]