The Pipeline Research Committee of the American Gas Association has funded a number of research programs at Battelle's Columbus Division and the University of Newcastle on stress-corrosion cracking (SCC) of line pipe steels since the first reported field failures in the mid 1960's. The primary objective of the research has been to identify the root cause of the failures and identify practicable mitigation procedures. One aspect of the research that has received considerable attention in recent years has been the relationship between surface properties of the line pipe steels and SCC susceptibility. In this paper, the recent findings in this area are summarized.

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