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入不同含量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.
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