开发了Q500NQR1和Q550NQR1高强耐候钢，研究了其显微组织、力学性能和耐腐蚀性能。结果表明：2种耐候钢的显微组织均由铁素体、珠光体和贝氏体组成，其综合力学性能优良，满足铁道车辆用钢的指标要求；在周期浸润腐蚀72 h后，Q500NQR1和Q550NQR1耐候钢的相对腐蚀速率（对比材料为Q345B钢）分别为44.5%和40.1%，耐大气腐蚀性能优良，满足铁路用耐候钢的标准要求；随着腐蚀时间的延长，2种耐候钢表面的腐蚀产物逐渐变成球状团簇，且球状团簇间变得紧密，对钢基体的保护作用增强。

Q500NQR1 and Q550NQR1 high strength weathering resistant steels were developed, and the microstructures, mechanical properties and corrosion resistance were studied. The results show that the microstructures of the two weathering resistant steels consisted of ferrite, pearlite and bainite. The comprehensive mechanical properties were excellent and met the standard requirements of railway vehicle steel. After periodic immersion corrosion for 72 h, the relative corrosion rates (the contrast material was Q345B steel) of Q500NQR1 and Q550NQR1 weathering resistant steels were 44.5% and 40.1%, respectively, which met the standard requirements of weathering resistant steel for railway, indicating excellent atmospheric corrosion resistance. With the increase of corrosion time, the corrosion products on surface of the two weathering resistant steels bacame globular clusters, and the globular clusters became tight, which enhanced the protection of steel substrate.