利用恒载荷试验机研究 X100 管线钢在 NS4溶液中恒载荷作用下的应力腐蚀开裂行为。结果表明，即使外加应力小于其屈服强度， X100管线钢也能发生应力腐蚀开裂，且为穿晶型的应力腐蚀开裂；裂纹萌生于贝氏体与铁素体相界之间、M/A岛与基体之间以及贝氏体板条之间的界面上。
Currently there is a demand to transport crude oil and gas by pipeline at a higher operating pressure in order to increase the capacity. For the investment reduction of long distance crude oil and natural gas pipeline project, the X100 grade ultrahigh strength pipeline steel will be adopted. Stress corrosion cracking (SCC) in pipeline is an important problem that threatens the safe operation of oil and gas transmission. Therefore, it is necessary to study SCC behavior of X100 pipeline steel in a standard near-neutral pH solution, NS4 solution. In this paper, constant loading tests of X100 pipeline steels were conducted at open circuit condition in deaerated NS4 solution. The results show that X100 pipeline steel under constant load in deareated NS4 solution exhibit transgranular stress corrosion cracking behavior. Even though the applied stress was less than the yield stress of X100 pipeline steel, stress corrosion cracking also occurred. It was found crack initiated at the interface of bainite phase and ferrite phase, M/A constituent and matrix, carbide and ferrite in bainite.
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