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| Analysis of inclusions in whole smelting process of non-oriented silicon steel DG47A |
| CAO Jian-qi1, CHEN Chao1, XUE Li-qiang1,2, LI Zhou3,4, ZHAO Jian1, LIN Wan-ming1,5 |
1. College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China;
2. No.2 Steelmaking Plant, Shanxi Taigang Stainless Steel Co., Ltd.,Taiyuan 030030, Shanxi, China;
3. College of Artificial Intelligence and Big Data for Medical Sciences,Shandong First Medical University and Shandong Academy of Medical Sciences, Jinan 250117, Shandong, China;
4. Department of Materials Science and Engineering, Harbin Institute of Technology, Shenzhen 518055, Guangdong, China;
5. College of New Energy and Materials Engineering, Shanxi Electronic Science and Technology Institute, Linfen 041075, Shanxi, China |
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Abstract For a high grade non-oriented silicon steel DG47A(Fe-2%Si-0.36%Al-0.26%Mn),clustered Al2O3-MgO spinel inclusion with a length of 50 μm, which may influence the product property in the sequent process, is found in a hot rolled sheet produced by a steelmaking plant. By analyzing the samples taken from the BOF→RH→tundish→continuous casting slab production process and thermodynamic calculation, the evolution of inclusions in the smelting process of this steel grade are studied. The morphology, size and type of inclusions were analyzed by scanning electron microscope and energy dispersive spectrometer analysis (SEM-EDS). The formation condition of Mg-Al spinel inclusion was calculated by thermodynamics. In addition,the mechanism of precipitation phase during solidification process was calculated by PANDAT software. The results show that SiO2 is the main inclusion after RH decarburization. There are Al2O3 and a small amount of SiO2 inclusions after 3 minutes of adding aluminum in RH. Afterwards, Al2O3-MgO and MnS-containing composite inclusions are formed after adding alloys of ferro-silicon and manganese in RH treatment. CaS-containing composite inclusions are formed after adding desulfurizers. There are no single Al2O3 inclusions before the content of CaS and MnS in the composite inclusions tended to increase, and MgO remained at about 25%. CaS and AlN inclusions are wrapped around the outer edge of Al2O3-MgO inclusions. The AlN and MnS inclusions were found in slab. After adding aluminum in RH, the average size of the inclusions is about 20-25 μm, and decreased to about 2-5 μm before tapping of RH. In the tundish and the slab, with the cooling of the molten steel,the second phase precipitated on the surface of the inclusions, and the average size of the inclusions slightly increased to around 3-6 μm. The thermodynamic calculation results show that, at 1 873 K, when the Mg content in the molten steel is greater than 0.000 26%, Al2O3-MgO inclusions are formed. During the cooling process of molten steel, AlN and MnS inclusions precipitated successively with the decrease of temperature.
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Received: 14 July 2022
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[1] 何忠治,赵宇,罗海文,等. 电工钢[M]. 北京:冶金工业出版社,2012.(HE Zhong-zhi,ZHAO Yu,LUO Hai-wen,et al. Electrical Steel[M]. Beijing:Metallurgical Industry Press,2012.)
[2] 林媛,王红霞,张文康,等. 大压下率冷轧无取向硅钢织构演变及性能[J]. 中国冶金,2022,32(5):64.(LIN Yuan,WANG Hong-xia,ZHANG Wen-kang,et al. Texture evolution and properties of non-oriented silicon steel by cold rolling with high reduction rate[J]. China Metallurgy,2022,32(5):64.)
[3] 薛利强,潘振东,吕令涛,等. 超高牌号无取向硅钢降钛工艺研究及改进[J]. 中国冶金,2020,30(10):60.(XUE Li-qiang,PAN Zhen-dong,L Ling-tao,et al. Research and improvement of technology to reduce Ti content in super-high grade non-oriented electrical steel[J]. China Metallurgy,2020,30(10):60.)
[4] 潘振东,林媛,顾祥宇,等. 提Si降Mn改善50WG470高磁感电工钢性能[J]. 钢铁钒钛,2019,40(2):166.(PAN Zhen-dong,LIN Yuan,GU Xiang-yu,et al. Improving the properties of 50WG470 high magnetic induction electrical steel by elevating Si content and reducing Mn content[J]. Iron Steel Vanadium Titanium,2019,40(2):166.)
[5] ZHU Cheng-yi,LIU Yu-long,XIAO Ying,et al. A new review on inclusion and precipitate control in grain-oriented silicon steels[J]. JOM,2022,74(8):3141.
[6] Saxena A,Chaudhuri S K. Correlating the aluminum content with ferrite grain size and core loss in non-oriented electrical steel[J]. ISIJ International,2004,44(7):1273.
[7] 吕学钧,张峰,王波,等. 夹杂物对无取向硅钢磁性能的影响[J]. 特殊钢,2012,33(4):22.(Ly Xue-jun,ZHANG Feng,WANG Bo,et al. Effect of inclusions on magnetic properties of non-oriented silicon steel[J]. Special Steel,33(4):22.)
[8] 付邦豪,陈超,成国光,等. 430不锈钢冶炼过程的夹杂物[J]. 钢铁,2012,47(1):40.(FU Bang-hao,CHEN Chao,CHENG Guo-guang,et al. Inclusions in 430 stainless steelmaking during AOD-LF-CC process[J]. Iron and Steel,2012,47(1):40.)
[9] 王博,邹平,孙秀兵,等. Q195热轧带钢大型夹杂物来源分析及控制[J]. 中国冶金,2021,31(8):60.(WANG Bo,ZOU Ping,SUN Xiu-bing,et al. Source analysis and control of large inclusions in Q195 hot rolled strip[J]. China Metallurgy,2021,31(8):60.)
[10] 王林珠,李翔,刘录凯,等. 镍基高温合金中非金属夹杂物成分和特征控制[J]. 中国冶金,2021,31(5):32.(WANG Lin-zhu,LI Xiang,LIU Lu-kai,et al. Control on composition and characteristic of non-metallic inclusions in nickel-base superalloy[J]. China Metallurgy,2021,31(5):32.)
[11] 王章印,姜敏,王新华. Q345D钢精炼过程夹杂物生成及演变行为[J]. 钢铁,2022,57(2):63.(WANG Zhang-yin,JIANG Min,WANG Xin-hua. Formation and evolution of inclusions in Q345D steel during secondary reefing process[J]. Iron and Steel,2022,57(2):63.)
[12] 郭建. Si、Mn脱氧条件下Q355低合金结构钢中非金属夹杂物的演变规律[J]. 上海金属,2022,44(4):97.(GUO Jian. Evolution of non-metallic inclusions in Q355 low alloy structural steel under conditions of Si and Mn deoxidization process[J]. Shanghai Metals,2022,44(4):97.)
[13] 杨峰,罗海明,魏晓东. 取向硅钢夹杂物控制[J]. 连铸,2020,39(4):49.(YANG Feng,LUO Hai-ming,WEI Xiao-dong. Inclusion control of oriented silicon steel[J]. Continuous Casting,2020,39(4):49.)
[14] 吕学钧,陈晓,郑少波,等. 无取向硅钢冶炼过程中的夹杂物遗传变化[J]. 电工材料,2014,5(9):37.(L Xue-jun,CHEN Xiao,ZHENG Shao-bo,et al. Heredity of non-metallic inclusion of non-oriented silicon steel during steel making process[J]. Electrical Engineering Materials,2014,5(9):37.)
[15] 胡志远,任强,张立峰. W800无取向电工钢中氧化物演变规律[J]. 钢铁研究学报,2018,4(30):282.(HU Zhi-yuan,REN Qiang,ZHANG Li-feng. Evolution of oxide inclusions in W800 non-oriented electrical steel[J]. Journal of Iron and Steel Research,2018,4(30):282.)
[16] 罗艳,刘洋,张立峰,等. 无取向硅钢夹杂物分析[J]. 太原理工大学学报,2014,45(1):34.(LUO Yan,LIU Yang,ZHANG Li-feng,et al. Analysis of inclusions in non-oriented silicon steel[J]. Journal of Taiyuan University of Technology,2014,45(1):34.)
[17] LUO Yan,YANG Wen,REN Qiang,et al. Evolution of non-metallic inclusions and precipitates in oriented silicon steel[J]. Metallurgical and Materials Transactions B,2018,49(3):926.
[18] 郭飞虎,仇圣桃,乔家龙,等. 无取向电工钢冶炼过程氧含量控制[J]. 特殊钢,2019,40(4):38.(GUO Fei-hu,QIU Sheng-tao,QIAO Jia-long,et al. Controlling oxygen in steelmaking process of non-oriented electrical steel[J]. Special Steel,2019,40(4):38.)
[19] 黄笛,肖海涛,许佳丽,等. MnS在SiO2-Al2O3复合氧化物上析出的机制[J]. 上海金属,2021,43(2):69.(HUANG Di,XIAO Hai-tao,XU Jia-li,et al. Mechanism of precipitation of MnS on SiO2-Al2O3 composite oxides[J]. Shanghai Metals,2021,43(2):69.)
[20] Petrovicˇ D S,Arh B,Tehovnik F,et al. Magnesium non-metallic inclusions in non-oriented electrical steel sheets[J]. ISIJ International,2011,51(12):2069.
[21] Hino M,Ito K. Thermodynamic Data for Steelmaking[M]. Sendai:Tohoku University Press,2010.
[22] SUN Yan-hui,ZENG Ya-nan,XUN Rui,et al. Formation mechanism and control of MgO·Al2O3 inclusions in non-oriented silicon steel[J]. International Journal of Minerals, Metallurgy and Materials,2014,21(11):1068.
[23] 乔家龙,郭飞虎,付兵,等. 无取向硅钢中硫化物的析出机理[J]. 材料导报,2021,35(20):20106.(QIAO Jia-long,GUO Fei-hu,FU Bing,et al. Precipitation mechanism of sulfide in non-oriented silicon steel[J]. Materials Reports,2021,35(20):20106.)
[24] ZHANG Ting,ZHANG Xiao-ming,GUO Zhi-yang,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.
[25] Jenkins K,Lindenmo M. Precipitates in electrical steels[J]. Journal of Magnetism and Magnetic Materials,2008,320(20):2423.
[26] 乔家龙,郭飞虎,胡金文,等. 无取向硅钢中氮化物的析出机理[J]. 材料热处理学报,2021,42(1):110.(QIAO Jia-long,GUO Fei-hu,HU Jin-wen,et al. Precipitation mechanism of nitride in non-oriented silicon steel[J]. Transactions of Materials and Heat Treatment,2021,42(1):110.)
[27] 杨健,李婷婷. 稀土处理的无取向硅钢夹杂物控制研究进展[J]. 钢铁,2022,57(7):1.(YANG Jian,LI Ting-ting. Research progress on inclusion control of non-oriented silicon steel with REM treatment[J]. Iron and Steel,2022,57(7):1.)
[28] 褚绍阳,干勇,仇圣桃,等. 锡或锑在无取向电工钢中的研究进展[J]. 中国冶金,2022,32(5):1.(CHU Shao-yang,GAN Yong,QIU Sheng-tao,et al. Research progress of tin or antimony in non-oriented electrical steel[J]. China Metallurgy,2022,32(5):1.) |
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2023, Vol. 58 
