Key Technologies of Internal Quality Control for Continuously Cast HighSpeed Rail Steel Bloom
CHEN Yong1,2,YANG Subo3,ZHU Miaoyong1
1. School of Materials and Metallurgy, Northeastern University, Shenyang 110004, Liaoning, China; 2. Panzhihua Iron and Steel Research Institute, Panzhihua 617000, Sichuan, China;
3. Vanadium Recovery and Steelmaking Plant, Panzhihua New Steel and Vanadium Co., Ltd., Panzhihua 617062, Sichuan, China
Abstract：The key technologies of internal quality control for continuously cast rail steel bloom at Panzhihua steel, such as mold electromagnetic stirring (MEMS), secondary cooling regime, and dynamic soft reduction at the end of solidification, and their results are introduced. The practice in recent 3 years shows that the above mentioned key technologies are helpful to control rail steel bloom central defects, such as central segregation, center looseness and central crack. The internal quality of continuously cast rail steel bloom was superior, the yield of liquid steel was up to 98.55%, the qualified rate of blooms was 99.97%, the grade of center looseness, central segregation and shrinkage cavity were ≤1.0, while central cracking and middle cracking were ≤0.5, and central segregation index of carbon was ≤1.05 in 2005. The rails produced from continuously cast blooms meet the requirements of highspeed 350 km/h tracks.
2006, Vol. 41 
