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| Formation mechanism and control of semi-macro-segregation in rail steel bloom |
| LI Hong-guang1, JI Cheng2, JIANG Dong-bin3, CHEN Tian-ming1, GUAN Rui2, CHEN Liang1 |
1. State Key Laboratory of Vanadium and Titanium Resource Comprehensive Utilization, Pangang Group Research Institute Co., Ltd., Panzhihua 617000, Sichuan, China;
2. School of Metallurgy, Northeastern University, Shenyang 110819, Liaoning, China;
3. School of Metallurgical andEcological Engineering, University of Science and Technology Beijing, Beijing 100083, China |
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Abstract Continuous casting bloom of heavy rail steel is an important base metal for heavy rail, the solidification microstructure of semi-macroscopic segregation area in rail steel bloom was studied to optimize the homogeneity of rail steel bloom and improve internal quality at last. The effect of microstructure on the semi-macroscopic segregation area ratio was studied and revealed via electromagnetic stirring test in continuous casting, it was showed that the area of semi-macroscopic segregation increased with more highly-developed equiaxed grains. The technical methods were proposed to control semi-macroscopic segregation, and therefore, to optimize the homogeneity of rail steel blooms. The slim and long segregation bands observed in rail steels were mitigated, along with the Mn segregation degree reduced from 0.068 to 0.050 examed by in-site metal scanning detector.
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Received: 29 March 2021
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2021, Vol. 56 
