The critical crack sizes of different materials in H_2S environment were thus figured out, and the curves with working pressures and equivalent stress to critical crack size were plotted.

由此确定了不同材料在不同环境溶液中的临界裂纹尺寸，得到了气瓶工作压力及等效应力与临界裂纹尺寸的关系曲线。

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The result show that the size of equivalent initial surface crack is less than 19.7to 22.5 percent of surface corrosion pit size which have the same life.

结果发现，把腐蚀坑等效为具有相同寿命的表面裂纹时，等效表面裂纹的尺寸比对应腐蚀的尺寸小19.7% - 22.5%。

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