CSP工艺含铝无取向电工钢中夹杂物的演变和控制
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摘要
为了更好地控制CSP工艺下电工钢中的夹杂物,研究了涟钢CSP工艺含铝电工钢夹杂物在精炼连铸热轧过程中的演变机理。RH合金化后钢中夹杂物有Al2O3,Al2O3-SiO2和Al2O3-CaO-CaS主要3种,RH出站和中包钢液中的夹杂物主要是Al2O3-CaO-CaS和少量单独的Al2O3和CaS夹杂。减少钢液中夹杂物的主要措施是降低RH出站前的顶渣氧化性。热轧卷材样中夹杂物与钢液中夹杂物不同,主要是AlN和MnS,夹杂物总量与氮、硫质量分数呈正相关,氮元素的影响最显著。
In order to control inclusions in electrical steel under CSP process better,the evolution mechanism of inclusions in the aluminum-containing electrical steel during the RH refining-continuous casting-hot rolling in the CSP line of Lianyuan Steel Company were investigated.The inclusions in the liquid steel are mainly Al_2O_3,Al_2O_3-SiO_2 and Al_2O_3-CaO-CaS after the RH alloying.The inclusions in the liquid steel are composed of most of Al_2O_3-CaOCaS and a small amount of Al_2O_3 and CaS at RH outgoing and in tundish.The main measure to reduce inclusions in the molten steel is to reduce the oxidation of the top slag before the RH outlet.The main inclusions in hot rolled coil are AlN and MnS.The total amount of inclusions is positively correlated with the content of nitrogen and sulfur,and the effect of nitrogen is the most significant.
In order to control inclusions in electrical steel under CSP process better,the evolution mechanism of inclusions in the aluminum-containing electrical steel during the RH refining-continuous casting-hot rolling in the CSP line of Lianyuan Steel Company were investigated.The inclusions in the liquid steel are mainly Al_2O_3,Al_2O_3-SiO_2 and Al_2O_3-CaO-CaS after the RH alloying.The inclusions in the liquid steel are composed of most of Al_2O_3-CaOCaS and a small amount of Al_2O_3 and CaS at RH outgoing and in tundish.The main measure to reduce inclusions in the molten steel is to reduce the oxidation of the top slag before the RH outlet.The main inclusions in hot rolled coil are AlN and MnS.The total amount of inclusions is positively correlated with the content of nitrogen and sulfur,and the effect of nitrogen is the most significant.
引文
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[16]吴绍杰,万勇,陈伟庆.铸坯热装温度对无取向硅钢中AlN和MnS析出行为的影响[J].北京科技大学学报,2013,35(8):1007.(WU Shao-jie,WAN Yong,CHEN Wei-qing.Effect of the hot charging temperature of slabs on AlN and MnS precipitation behavior in non-oriented silicon steel[J].Journal of University of Science and Technology Bejing,2013,35(8):1007.)
[2] ZHANG T,ZHANG X,GUO Z,et al.AlN precipitates and microstructure in non-oriented electrical steels produced by twin-roll casting process[J].Acta Metallurgica Sinica,2013,26(4):483.
[3]夏彬,韩松,张楠,等.硅钢的研究现状及发展趋势[J].中国冶金,2018,28(6):9.(XIA Bin,HAN Song,ZHANG Nan,et al.Research status and development trend of silicon steel[J].China Metallurgy,2018,28(6):9.)
[4]项利,陈圣林,裴英豪,等.国内薄板坯连铸连轧生产电工钢的现状及研究进展[C]//第十一届中国钢铁年会论文集.北京:冶金工业出版社,2017:1.(XIANG Li,CHEN Shenglin,PEI Ying-hao,et al.Domestic current status and research progress of producing electrical steel by thin slab casting and rolling progess[C]//Papers Collection of the Eleventh China Iron and Steel Annual Conference.Beijing:Metallurgical Industry Press,2017:1.)
[5]盛鹏飞.50W350牌号无取向电工钢夹杂物的特征及控制研究[D].合肥:安徽工业大学,2017.(SHENG Peng-fei.Study on the Characteristics and Control of Inclusions in 50W350Grade Non-oriented Electrical Steel[D].Hefei:Anhui University of Technology,2017.)
[6]盛鹏飞,项利,仇圣桃.100tBOF-CAS-RH-230 mm板坯连铸流程2.66%Si无取向电工钢50W350夹杂物分析[J].特殊钢,2017,38(3):9.(SHENG Peng-fei,XIANG Li,QIU Sheng-tao.Analysis on inclusions of 2.66%Si non-oriented electrical steel 50W350in 100tBOF-CAS-RH-230 mm slab casting flowsheet[J].Special Steel,2017,38(3):9.)
[7]邱雷.无取向硅钢W800生产过程中洁净度研究[D].武汉:武汉科技大学,2015.(QIU Lei.Research on cleanless of NonOriented Silicon Steel W800During Production Process[D].Wuhan:Wuhan University of Science and Technology,2015.)
[8]李士琦,王安仁,杨树峰,等.无取向硅钢夹杂物来源研究[J].工程科学学报,2016,38(s1):181.(LI Shi-qi,WANG Anren,YANG Shu-feng,et al.Study on source of inclusions in non-oriented silicon steel[J].Chinese Journal of Engineering,2016,38(s1):181)
[9]乔智.BOF-RH-CSP流程生产无取向电工钢钢水洁净度研究[D].昆明:昆明理工大学,2015.(QIAO Zhi.Study on Cleanliness of Non-Oriented Electrical Steel Produced by BOF-RH-CSP process[D].Kunming:Kunming University of Science and Technology,2015.)
[10]王建军,刘静静,秦哲,等.无取向硅钢精炼过程非金属夹杂物的行为[J].钢铁钒钛,2012,33(3):59.(WANG Jian-jun,LIU Jing-jing,QIN Zhe,et al.Behavior of non-metallic inclusions in refining process of non-oriented silicon steel[J].Iron Steel Vanadium Titanium,2012,33(3):59.)
[11]任强,李明,程林,等.自动扫描电镜在无取向电工钢析出物分析上的应用[J].中国冶金,2018,28(s1):99.(REN Qiang,LI Ming, CHENG Lin,et al.Application of antomatic scanning electron microscope on analysis of precipitates in non-oriented electrical steels[J].China Metallurgy,2018,28(s1):99.)
[12] FENG Z,LE D E M,ZHEN Y Z,et al.Effects of calcium treatment on non-metallic inclusions and magnetic properties of non-oriented silicon steel sheets[J].Baosteel Technical Research,2013,7(1):12.
[13] SUN Y,ZENG Y,XU R,et al.Formation mechanism and control of MgO·Al2O3inclusions in non-oriented silicon steel[J].International Journal of Minerals Metallurgy and Materials,2014,21(11):1068.
[14] FENG Z,CHANG S M,BO W,et al.Control of nonmetallic inclusions of non-oriented silicon steel sheets by the rare earth treatment[J].Baosteel Technical Research,2011,5(2):41.
[15]亓建,刘军,李彦军,等.无取向电工钢的金相与析出物探讨[J].物理测试,2017,35(4):1.(QI Jian,LIU Jun,LI Yanjun, et al.Discussion about the microstructure and precipitates of non-oriented electrical steel[J].Physics Examination and Testing,2017,35(4):1.)
[16]吴绍杰,万勇,陈伟庆.铸坯热装温度对无取向硅钢中AlN和MnS析出行为的影响[J].北京科技大学学报,2013,35(8):1007.(WU Shao-jie,WAN Yong,CHEN Wei-qing.Effect of the hot charging temperature of slabs on AlN and MnS precipitation behavior in non-oriented silicon steel[J].Journal of University of Science and Technology Bejing,2013,35(8):1007.)