What kind of steel should be used for railway rails?
At present, foreign timber rail basically is pearlite steel, while the rail strength can be increased by alloying and heat treatment technology, but is close to the limit, cannot be solved in improving the strength while maintaining good toughness from the root of the problem, more unable to meet the requirements of high speed and heavy haul railway on rail and rail turnout is higher and the technology. Bainitic steel is the invention patent of Professor Fang Hongsheng of Tsinghua University. In 2005, it was coordinated by Baotou science and Technology Bureau to promote cooperation between Baotou Steel and Tsinghua University. It was listed as a key research cooperation project in Baotou. The bainitic rail solves the technical problems of strength, toughness, plasticity and processability simultaneously meeting the requirements. The operation test of Shenyang Bureau, Shijiazhuang Taiyuan line, Beijing Baotou line, Daqin Railway Line in recent years proved that the bainite rail turnout rail turnout than the strength can be increased more than 2 times, the toughness can be increased more than 4 times, life can be increased more than 3 times. In October last year, the Ministry of Railways organized the "railway heavy rail bifurcated rail structure and material optimization research" bidding project, Baotou Steel won the bid at an absolute advantage. The next step is to generalize to curve rail, combined turnout rail and other varieties, and the economic and social benefits will be more remarkable.
The rail locomotive need to withstand pressure, friction and shock loads, required strength, hardness and toughness sufficient, high quality requirements, we must test its mechanical properties and macrostructure and drop test etc.. "High strength, high toughness bainitic rail" and the major technological project undertaken by Baotou Steel Group, "rare earth high strength weathering steel", was identified by experts. Experts agree that bainitic rail is a major breakthrough in the history of rail material research and development, filling the gap of high-speed and heavy rail in China and reaching the international advanced level.
The railway began to switch to rail, and after decades of improvement, the materials used were converted to steel, while the quality of steel was greatly improved. Rail used in the railway must bear great pressure, so it is necessary to use very high quality steel. The requirement of rail for steel is higher than that of other applications. The same small defect may not cause any problems in the reinforcement used by the building; however, the occurrence of the railway rail at any time will lead to the derailment of the track and the derailment of the train.
