采用金相显微术、扫描电镜、拉伸试验和电化学试验等方法研究了固溶温度对00Cr25Ni7Mo4N双相不锈钢显微组织、力学性能和耐腐蚀性能的影响。结果表明：热轧态和固溶态（固溶温度1 025~1 200℃）双相不锈钢的显微组织都为铁素体（α相）+奥氏体（γ相）双相组织，随着固溶温度升高，α相含量不断增大，γ相含量不断减小，在固溶温度为1 175℃时，α相和γ相含量接近于1：1；相较于热轧态双相不锈钢，不同温度固溶处理后，双相不锈钢的抗拉强度、屈服强度和洛氏硬度都有不同程度的减小，而断后伸长率、断面收缩率和冲击功都有不同程度的增大，在固溶温度为1 175℃时，双相不锈钢的抗拉强度和屈服强度较高，而断后伸长率、断面收缩率和冲击功都达到最大值；当固溶温度为1 175℃时，双相不锈钢的自腐蚀电位最正，自腐蚀电流密度最小，容抗弧半径和钝化膜电阻最大，弥散系数最接近于1，具有最佳的耐腐蚀性能。

The effects of solution temperature on the microstructure, mechanical properties and corrosion resistance of 00Cr25Ni7Mo4N duplex stainless steel were studied by means of metallographic microscopy, scanning electron microscopy, tensile testing and electrochemical testing. The results show that the microstructure was dual phase structure of ferrite (α phase) and austenite (γ phase) for hot-rolled duplex stainless steel and duplex stainless steel after solution treatment at temperatures of 1 025-1 200℃. With the increase of solution treatment temperature, the content of α phase increased and the content of γ phase decreased, at solution treatment temperature of 1 175℃, the content ratio of α phase to γ phase was close to 1:1 in duplex stainless steel. After solution treatment at different temperatures, the tensile strength, yield strength and Rockwell hardness of the steel decreased in varying degrees, while elongation, percentage reduction of area and impact energy increased in varying degrees, compared with those of the hot-rolled duplex stainless steel. At solution treatment temperature of 1 175℃, the tensile strength and yield strength of the duplex stainless steel were high, while elongation, percentage reduction of area and impact energy all reached their maximum. When the solution treatment temperature was 1 175℃, the duplex stainless steel had the best corrosion resistance, exhibiting the most positive free corrosion potential, the smallest free corrosion current density, the largest capacitive arc radius and passive film resistance, and the dispersion coefficient closest to 1.