采用慢应变速率试验（SSRT）研究了不同电位下X70管线钢在近中性pH溶液中的应力腐蚀破裂（SCC）行为，同时研究了溶液中通往不同含量CO2对SCC的影响。结果表明，X70管线钢在近中性pH溶液中的开裂方式是穿晶型的，具有准解理特征，并且随着外加阴极电位的降低，SCC敏感性增加，随CO2含量的增加，pH值降低，SCC敏感性增加，均表现为氢致开裂占主导。
The stress corrosion cracking(SCC) behaviior of X70pipeline steel in near-neutral-pH solutions at different applied potentials and the effect of different levels of CO2 on SCC were studied with slow strain rate testing (SSRT). The results showed that the cracking mode of X70pipeline steel in near-neutral-pH solutions was transgranular, with the features of quasi-cleavage. The susceptibilit to SCC increased as the applied potential moved towards the cathodic direction The value of pH decreased with the increased addition of CO2 in the solution, which increased the susceptibitlity to SCC. Hydroge induced cracking(HIC) dominated the process.
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