What is the Q420qD steel?

Q420qD steel is a kind of atmospheric corrosion resistant structural steel specially used to build various steel structure bridges (railways, highways, cross-water, and cross-sea). It has high strength, toughness and can withstand the loads and impacts of rolling stock. In addition, it also has good fatigue resistance, certain low temperature toughness and atmospheric corrosion resistance.

Q420qD steel composition(%)

Q420qD steel mechanical properties

Q420qD bridge steel is the fifth generation of bridge steel developed and produced in my country. In order to construct the Chongqing Chaotianmen Yangtze River Bridge and the Nanjing Dashengguan Yangtze River Bridge on the Beijing-Shanghai High-speed Railway, Q420q steel plate was developed for some of the components with large forces, which is the fifth generation of bridge steel in China. Since entering the new century, my country's bridge construction has made a new leap. The span of the bridge continues to expand, and the passing speed of trains continues to increase. With the development of domestic railway construction in the direction of high speed and heavy load, railway steel bridges are developing in the direction of high speed, heavy load, large span, beautiful and novel structure, and full welding, which puts forward higher requirements for the performance of bridge steel.