精炼渣对U75V钢中非金属夹杂物影响的研究  

Study on the influence of refined slag on non-metallic inclusions in U75V steel

作　　者：朱君 杨吉春[1] 谌智勇[2] 樊志明 张立峰 ZHU Jun;YANG Jichun;CHEN Zhiyong;FAN Zhiming;ZHANG Lifeng(School of Materials and Metallurgy,Inner Mongolia University of Science and Technology,Baotou 014010,China;Steelmaking Plant of Inner Mongolia Baotou Steel Co.,Ltd.,Baotou 014010,China;North China University of Technology,Beijing 100144,China)

机构地区：[1]内蒙古科技大学材料与冶金学院,内蒙古包头014010 [2]内蒙古包钢钢联股份有限公司炼钢厂,内蒙古包头014010 [3]北方工业大学,北京100144

出　　处：《炼钢》2022年第4期54-62,83,共10页Steelmaking

摘　　要：研究了精炼渣碱度和渣中Al_(2)O_(3)含量对U75V钢中非金属夹杂物的影响。结果表明,精炼渣碱度对钢中夹杂物成分影响较大。在U75V钢精炼过程中,随着精炼渣碱度由1.4提升至2.0,钢中夹杂物的成分发生了较大变化。其中,平均w(CaO)由43%升高至62%,平均w(SiO_(2))、w(MgO)和w(Al_(2)O_(3))均有不同程度的下降,分别由37%、16%、4%下降到29%、7%、2%。精炼渣碱度对U75V钢中夹杂物数密度影响较大。碱度为1.4时,夹杂物数密度为2.95个/mm^(2),随着碱度升高至1.8,夹杂物数密度降至1.42个/mm^(2),继续升高精炼渣碱度,夹杂物数密度开始增大。精炼渣碱度为1.8时,钢中夹杂物数密度最小,此时的精炼渣更有利于夹杂物的去除。精炼渣中Al_(2)O_(3)含量对钢中夹杂物有重要影响。随着精炼渣中w(Al_(2)O_(3))由0升至3%,夹杂物中CaO和SiO_(2)含量降低,MgO和Al_(2)O_(3)含量升高;继续提升精炼渣中w(Al_(2)O_(3))至6%,夹杂物中w(CaO)不再变化,稳定在40%左右,而MgO、SiO_(2)含量略有降低,w(Al_(2)O_(3))则升高至18%左右。随着渣中Al_(2)O_(3)含量升高,钢中夹杂物数密度持续上升,且当渣中w(Al_(2)O_(3))由3%增加至6%时,夹杂物数密度增加了近1倍。因此U75V需要将精炼渣中w(Al_(2)O_(3))控制在3%以下。在生产过程中,应严格控制合金和造渣材料中的Al s和Al_(2)O_(3)含量,减少进入炉渣中Al_(2)O_(3)含量,将炉渣碱度控制在1.8左右。The effects of basicity of refining slag and Al_(2)O_(3) content on non-metallic inclusions in U75V steel were studied.The results showed that the basicity of refining slag had a great influence on the inclusions in steel.In the refining process of U75V steel,with the increase of basicity of refining slag from 1.4 to 2.0,the composition of inclusions in steel changed greatly.The average mass fraction of CaO increased from 43%to 62%,while the average mass fraction of SiO_(2),MgO and Al_(2)O_(3) decreased from 37%,16%and 4%to 29%,7%and 2%respectively.The basicity of refining slag had a great influence on the number density of inclusions in U75V steel.When the basicity was 1.4,the number density of inclusion was 2.95/mm^(2).With the increase of basicity to 1.8,the number density of inclusion decreased to 1.42/mm^(2),and the number density of inclusion began to increase.When the basicity of refining slag was 1.8,the number density of inclusion in steel was the lowest,and the refining slag was more conducive to the removal of inclusion.Al_(2)O_(3) content in refining slag had an important effect on inclusions in steel.With the increase of Al_(2)O_(3) mass fraction from 0 to 3%,the contents of CaO and SiO_(2) in the inclusions decreased,while the contents of MgO and Al_(2)O_(3) increased.The mass fraction of Al_(2)O_(3) in the refining slag was increased to 6%,and the mass fraction of CaO in the inclusion remained stable at about 40%,while the content of MgO and SiO_(2)decreased slightly,and the mass fraction of Al_(2)O_(3) increased to about 18%.With the increase of Al_(2)O_(3) content in slag,the number density of inclusion in steel increased continuously,and when Al_(2)O_(3) mass fraction in slag increased from 3%to 6%,the number density of inclusion increased by nearly one time.Therefore,U75V needs to control the Al_(2)O_(3) mass fraction in refining slag below 3%.In the process of production,Al_(s) and Al_(2)O_(3) content in alloy and slag-making materials should be strictly controlled,Al_(2)O_(3) content in slag

关 键 词：精炼渣 碱度 U75V钢 渣中Al_(2)O_(3)含量 非金属夹杂物 

分 类 号：TF769[冶金工程—钢铁冶金]