应力腐蚀裂纹是指金属材料在某些特定介质和拉应力共同作用下所发生的延迟破裂现象。从表面上看，无明显的均匀腐蚀痕迹。所观察到的应力腐蚀裂纹呈龟裂形式，断断续续：如果在焊缝表面上，多以横向裂纹出现。若深入金属内部观察其形状如同树根样；若从断口形态看，属脆性断口特点。
...构件（容器、管道等）在腐蚀介质和拉伸应力的共同作用下产生一种 延迟破坏的现象，称为应力腐蚀裂纹(Stress Corrosion Cracking)，简称SCC 裂纹。
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结果表明，该进气管断裂系由于应力腐蚀裂纹失稳扩展所造成。
The results show that the failure of the tube is due to stress corrosion crack propagation.
还会形成穿透型裂纹，造成镀层下本体金属的疲劳或应力腐蚀裂纹。
Through-thickness cracking also can lead to fatigue or stress corrosion cracking of the base metal beneath the plating.
直缝埋弧焊管焊后残余应力是导致焊管应力腐蚀裂纹产生的主要原因。
Residual stress of longitudinal submerged arc welded pipe after welding is the major reason caused welded pipe stress corrosion crack, its stress level directly decide pipeline safety in service.
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