对９Ｃｒ１８Ｍｏ和ＧＣｒ１５两种钢的腐蚀、磨蚀和腐蚀疲劳行为进行了实验研究．结果表明，在质量分数为２％～５％硫酸，１％盐酸，４０％硝酸，３．５％ＮａＣｌ水溶液和蒸馏水中，９Ｃｒ１８Ｍｏ的抗腐蚀性能优于ＧＣｒ１５；在含０．０２％与５％沙量的沙浆中，９Ｃｒ１８Ｍｏ的年磨蚀率低于ＧＣｒ１５的数值；在空气、蒸馏水和３．５％ＮａＣｌ水溶液中，９Ｃｒ１８Ｍｏ的疲劳裂纹扩展速率也低于ＧＣｒ１５．９Ｃｒ１８Ｍｏ和ＧＣｒ１５在中性水溶液中疲劳裂纹扩展均表现为氢脆机制． The corrosion, erosion and corrosion fatigue behaviors of 9Cr18Mo and GCr15 steels were studied experimentally. The results showed that the corrosion resistance of 9Cr18Mo was better than that of GCr15 in 2% ~ 5% sulfuric acid, 1% hydrochloric acid, 40% nitric acid, 3.5% NaCl aqueous solution and distilled water. The annual abrasion rate of 9Cr18Mo was lower than that of GCr15 in the mortar of sand. The fatigue crack growth rate of 9Cr18Mo in air, distilled water and 3.5% NaCl aqueous solution was also lower than that of GCr15.9Cr18Mo and GCr15 in neutral aqueous solution Crack propagation are manifested as hydrogen embrittlement mechanism.