Atmospheric Corrosion Performance of W450QN Steel

Three years atmospheric corrosion of W450QN steel made by Wuhan Iron & Steel (Group) Corp was carried out. The results show that the corrosion resistance of W450QN was better than that of Q345, the average corrosion rate in Qingdao, Jiangjin and Qionghai decreased by a third compared with that of Q345. The polarization curves of 3-year exposed rusty steel showed that both of the initial passivity current and maintaining passivity current of W450QN were smaller than those of Q345, indicating a better protective performance of W450QN due to its compact rust layer and higher mass transfer resistance.