Key technologies of cleanliness and homogeneity control for high-speed heavy rail steel
WANG Yu-chang1,2,ZHANG Jia-quan1
1. School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing, Beijing 100083, China 2. Steel Mill of Baotou Iron and Steel Co., Baotou 014010, Nei Mongol, China
Abstract：High quality of heavy-haul rail steel is necessary for high-speed railway. Therefore, improving the cleanliness and homogeneity of high-speed heavy rail steel are the key technologies for improving the product quality. Technologies such as using the oxidizing technology of non-Aluminum, vacuum degassing (VD), protecting cast in all process and the tundish metallurgical technology, strict casting speed and molten steel temperature control, M-EMS, dynamic secondary cooling and dynamic soft reduction control technologies were used in Baotou Steel. The practice shows that in the high-speed heavy rail steel, w T ［O］≤0.0020%，w［N］≤0.0050%，w［H］≤0.00015%，w［Al］≤0.0040%, non-metallic inclusions category A ≤2.0 level, while B ,C and D ≤1.0 level. The average rate of center looseness index≤1.0 is 83.1%, the average rate of center shrinkage cavity index≤0.5 is 94.3%, and the highest index of carbon central segregation is 1.07.The quality of the production can meet the requirements of “rail standards for the 200km/h speed railway line for passenger transportation”.
王玉昌 ，张家泉. 高速重轨钢洁净度与均质性控制关键技术[J]. 中国冶金, 2015, 25(04): 7-11.
WANG Yu-chang,,ZHANG Jia-quan. Key technologies of cleanliness and homogeneity control for high-speed heavy rail steel. China Metallurgy, 2015, 25(04): 7-11.
2015, Vol. 25 
