通过恒变形和恒负荷试验研究了18-8不锈钢在5NH_2SO_4-(0～1.0)NNaCl介质中的应力腐蚀特征,发现5NH_2SO_4-0.5NNaCl溶液是应力腐蚀破裂的最敏感介质。溶液中NaCl浓度≤0.1N,随浸渍时间的延长均匀腐蚀率几乎成线性增加,且产生不均匀的腐蚀,但不产生应力腐蚀裂纹。在(0.1～1.0)NNaCl范围内其中0.5N均匀腐蚀率最低,但最易产生穿晶 The stress corrosion characteristics of 18-8 stainless steel in 5NH_2SO_4 - (0 ~ 1.0) NNaCl media were studied by constant deformation and constant load tests. It was found that 5NH_2SO_4 - 0.5NNaCl solution was the most sensitive medium for stress corrosion cracking. The NaCl concentration in the solution is less than or equal to 0.1N, and the uniform corrosion rate increases almost linearly with the immersion time, and produces nonuniform corrosion but does not produce stress corrosion cracking. In the range of (0.1 ~ 1.0) NNaCl 0.5N uniform corrosion rate of the lowest, but the most likely to produce transcrystallization