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| Improvement of quality of 320 mm×410 mm bloom in continuous casting of railway steel and its application |
| CHEN Liang1,2，SONG Bo1，CHEN Tian-ming2，LI Yang-zhou3，LI Zhi-qiang2，LI Jian-quan3 |
（1. School of Metallurgyical and Ecological Engineering， University of Science and Technology Beijing， Beijing 100083， China
2. Pangang Group Research Institute Co.， Ltd.， Chengdu 611731， Sichuan， China
3. Steel and Vanadium Co.， Ltd.， Pangang Group， Panzhihua 617022， Sichuan， China） |
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Abstract In order to improve the inner quality of bloom of railway steels and meet the requirement of rail flaw inspection. Appropriate secondary cooling system， F-EMS， dynamic soft reduction technology， control of molten steel superheat and casting speed were put forward to solve the segregation and center porosity of railway steel bloom in current study. The producing technology of 320 mm×410 mm continuous bloom of railway steel was established based on the above. The center equiaxial crystal rate of bloom was steadily controlled not less than 40%. The rate of center porosity that was not more than 0.5 level was above 91%. The rate of center segregation that was not more than 0.5 level was above 87%. Carbon segregation index of bloom ranged from 0.95 to 1.07. The quality of bloom and steel rail produced is better and can meet the requirement of CRCC。
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Received: 07 July 2016
Published: 18 April 2017
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2017, Vol. 52 
