在固溶温度（1 025~1 200℃）对新型建筑耐候钢进行了固溶处理，通过显微形貌观察、力学性能试验和电化学试验研究了固溶温度对其显微组织、力学性能和耐腐蚀性能的影响。结果表明，热轧态和固溶态耐候钢的显微组织都为铁素体和奥氏体，固溶温度为1 175℃时，耐候钢中铁素体和奥氏体含量接近1∶1；相对于热轧态耐候钢，固溶态耐候钢的强度和洛氏硬度偏低，但是断后伸长率、断面收缩率、冲击吸收能较高，固溶温度为1 175℃时，耐候钢具有较高的强度和硬度，且韧塑性和冲击吸收能都获得最大值；极化曲线和电化学阻抗谱测试结果显示，固溶温度为1 175℃时，耐候钢具有最好的耐蚀性能。

A new building weathering steel was treated at solution treatment temperatures of 1 025-1 200 ℃. The effects of solution treatment temperature on the microstructure, mechanical properties and corrosion resistance of the new building weathering steel were studied by observation of micro morphology, mechamical property testing and electrochemical testing. The results show that ferrite and austenite were the microstructure for both hot-rolled weathering steel and solution-treated weathering steel. when the solution treatment temperature was 1 175 ℃, the ratio of ferrite content and austenite content in the weathering steel was close to 1∶1. The strength and Rockwell hardness of the solution-treated weathering steel were lower, but the percentage elongation after fracture, percentage reduction of area and impact absorbed energy were higher, comparing with the hot-rolled weathering steel. At solution treatment temperature of 1 175 ℃, the weathering steel had high strength and hardness, and got the maximum values in toughness, plasticity and impact absorbed energy. The polarization curves and electrochemical impedance spectroscopy results show that the weathering steel had the best corrosion resistance when the solution temperature was 1 175 ℃.