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Inclusion Behavior of LCAK Steel in Tundish Pouring Process |
YIN Xue, SUN Sai-yang, SUN Yan-hui, ZHAO Yong, GE Liang, ZHANG Xi-chao |
School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China |
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Abstract The variations of inclusion characteristic of LCAK in tundish and normal slabs produced by BOF-Ar station-CC processes were studied by systematically sampling in different pouring time and nomal slabs of steel production. Analysis methods mainly include total oxygen and nitrogen content analysis, optical microscopy, scanning electronic microscope (SEM), and energy dispersive X-ray spectroscopy (EDS). The results show that: Total oxygen content at the starting and end of ladle pouring is higher than the middle pouring, which indicate that there exists re-oxidation during ladle change practice. The inclusions in tundish and normal slabs are classified into three types according to their morphology and composition: alumina inclusions; MnS inclusions; tundish flux inclusions or ladle slag inclusions. Inclusions of tundish and slab mainly contain Al2O3 inclusions with the size of 1-4 μm,also there are lots of MnS inclusions in the slab result in the rising of the number density. The number of bubble+alumina inclusions increases on steel of higher sulphur content. To sum up, at the stage of starting and end of pouring after the exchange of ladle, re-oxidation is the main reason which restrain the quality of the slab.Meanwhile, the sulfur content in steel should be controlled in a certain range in order to decrease the bubble+alumina inclusions and also avoid the precipitation of MnS inclusions during the solidification process.
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Received: 09 September 2013
Published: 05 August 2014
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[1] |
ZHU Tan-hua, ZHOU Qiu-yue, REN Ying, DUAN Hao-jian, ZHANG Li-feng. Inclusion evolution in IF steel during tundish reoxidation[J]. Iron and Steel, 2020, 55(3): 35-39. |
[2] |
LIN Peng,ZHANG Hong-cai,LIU Ying,XU Zheng-zhou. Cause analysis of surface crack defects of gear steel 20CrNiMo rolled product[J]. PHYSICS EXAMINATION AND TESTING, 2020, 38(2): 40-. |
[3] |
LAN Peng, TIE Zhan-peng, ZHANG Wei, MIAO Hong-sheng, YAN Qing-zhong, ZHANG Jia-quan. Research progress on spot segregation defects in continuously cast semi-products[J]. Iron and Steel, 2020, 55(2): 11-22. |
[4] |
HU Chang-qing,WANG Xiao-lei,SHI Xue-feng,WANG Zhi-xing,HAN Wei-gang. Effect of alkalinity and MgO content on mineral composition and microstructure of FeOx-SiO2-CaO-MgO-Al2O3 system[J]. JOURNAL OF IRON AND STEEL RESEARCH , 2020, 32(2): 103-110. |
[5] |
. Analysis and control of slag inclusion defect of low carbon steel slab[J]. , 2020, 45(2): 0-0. |
[6] |
. Flow field simulation and control structure optimization of two-strand T-ship tundish[J]. , 2020, 45(2): 0-0. |
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