Abstract
In order to comparatively assess near‐neutral pH stress corrosion cracking (NNpH‐SCC) resistance of pipeline steels with different strength, constant load tests in NS4 solution purged with 5%CO2–N2 gas mixture were conducted on American Petroleum Institute (API) grade X70, X80 and X100 pipeline steels. Experimental results show that pit cracks appeared on the surface of X70 steel and non‐pit cracks appeared on X100 steel. However, for X80 steel both pit cracks and non‐pit cracks were observed, but pit cracks dominated. The near‐neutral pH SCC resistance decreased in the order of X70, X100 and X80 at the same applied stress level.
Published Version
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