BOF-RH-CC与BOF-LF-CC流程对冷镦钢ML08A1洁净度的影响  

Effect of BOF-RH-CC and BOF-LF-CC Process on Cleanness of Cold Heading Steel ML08Al

作　　者：屠兴圹 徐建飞 杨成威 苏振伟 黄云飞 TU Xing-kuang;XU Jian-fei;YANG Cheng-wei;SU Zhen-wei;HUANG Yun-fei(Zenith Steel Group Co Ltd,Technology Center,Changzhou 213011)

机构地区：[1]中天钢铁集团有限公司技术中心,常州213011

出　　处：《特殊钢》2022年第3期56-59,共4页Special Steel

摘　　要：分析了"BOF-RH-CC"和"BOF-LF-CC"两种工艺流程生产的ML08Al钢中非金属夹杂物类型数量密度及总氧变化。结果表明,两种流程转炉脱氧合金化后钢中非金属夹杂物主要为Al_(2)O_(3);采用"BOF-LF-CC"流程,LF精炼结束钢中部分非金属夹杂物由Al_(2)O_(3)转变为Al_(2)O_(3)·CaO和Al_(2)O_(3)·MgO;而采用"BOF-RH-CC"流程,RH真空后钢中非金属夹杂物仍然以Al_(2)O_(3)为主。转炉出钢脱氧合金化后,钢水中总氧含量27.8×10^(-6)~31.5×10^(-6),经过LF精炼后,总氧含量为20.2×10^(-6)~22.5×10^(-6),而经过RH处理后,总氧含量为14.7×10^(-6)~15.3×10^(-6)。LF精炼和RH真空处理对夹杂物数量的去除率分别为49.6%和80.9%。因此,"BOF-RH-CC"工艺流程生产的ML08A1钢水洁净度优于"BOF-LF-CC"工艺流程生产的钢水。The types and quantity density of non-metallic inclusions,and the change of total oxygen in steel ML08Al produced by the two processes BOF-RH-CC and BOF-LF-CC are analyzed.The results show that the main non-metallic inclusions in steel after BOF deoxidizing alloying of two process are Al_(2)O_(3),in the process of"BOF-LF-CC",the parLial non-metallic inclusions in steel at the end of LF refining are changed from Al_(2)O_(3)to Al_(2)O_(3)·CaO and Al_(2)O_(3)·MgO,but in the process of"BOF・RH-CC",after RH vacuum the non-metallic inclusions Al_(2)O_(3)are still dominated.After deoxidizing alloying,the total oxygen content in BOF molten steel is 27.8×10^(-6)~31.5×10^(-6),the total oxygen content in steel at LF end is 20.2×10^(-6)~22.5×10^(-6),but the total oxygen content in steel at RH end is 14.7×10^(-6)~15.3×10^(-6).The removal rates of inclusions by LF refining and RH vacuum treatment are 49.6%and 80.9%respectively.Therefore,the cleanness of the cold heading steel ML08Al produced by the process of "BOF·RH-CC"is better than that produced by the process of"BOF-LF-CC".

关 键 词：冷镦钢ML08Al 非金属夹杂物 RH LF 洁净度 

分 类 号：TF769[冶金工程—钢铁冶金]