The development of Chinese bridge steel

Bridge steel plate is a special steel plate for railway or highway bridge. It requires high strength, toughness and bear the load and impact of the locomotive and vehicle, and must have good fatigue resistance, low temperature toughness and corrosion resistance.

　　The development of bridge steel in China is closely related to the construction of railway steel bridge, and has experienced the development process of low carbon steel, low alloy steel and high strength steel. Up to now, there are 6 stages in the development of structural steel for bridge in china:

　　1, the first generation

　　The first generation of bridge steel is only A3q and 16q two steel, yield strength more than 240MPa, the tensile strength is more than 380MPa.

　　Second, 2 generation

　　In order to build Nanjing Yangtze River Bridge, in 1962 successfully developed 16Mnq steel and low-alloy steel, yield strength more than 345MPa, the tensile strength is more than 520MPa, the maximum plate thickness is 32mm, which is the second generation of bridge steel, which is now widely used in Q345q steel.

　　Third, 3 generation

　　In order to develop 15MnVNq steel built in Jiujiang, Yangtze River bridge research, yield strength more than 420MPa, the tensile strength is more than 540MPa, which is the third generation of bridge steel.

　　Fourth, 4 generation

　　At the end of twentieth Century, in order to build the Wuhu of Yangtze River bridge, and reducing carbon niobium microalloying in 16Mnq steel on the basis of research and development of 14MnNbq steel, yield strength more than 370MPa, the tensile strength is more than 530MPa, which is the fourth generation of bridge steel, which is now widely used in Q370q steel.

　　Fifth, 5 generation

　　In order to build the Chongqing Chaotianmen Yangtze River bridge and Beijing Shanghai high-speed railway Nanjing Dashengguan Yangtze River bridge, according to the component force of the development of the Q420q steel plate, which is the fifth generation of bridge steel.

　　Sixth, 6 generation

　　At present, in order to meet the needs of Shanghai Yangtze River bridge design, is developing a higher strength of Q500q steel plate, which will be the sixth generation of bridge steel.

　　With the development of the domestic railway construction to the direction of high speed and heavy load, the railway steel bridge is developing to high speed, heavy load, large span, beautiful structure and full welding direction. The increasing application amount and the rapid development of domestic steel bridge of iron and steel industry, the urgent need to accelerate the popularization and application of high performance steel bridge, in order to meet the needs of modern manufacturing steel bridge, steel bridge will also be further developed.

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