For evaluation of performance of submerged arc welded (SAW) large-diameter pipes of grades X65, X70, X80 and X100 hydrogen-induced stress corrosion cracking (HSCC) tests to NACE TM0177-96 Method A in test solution A and constant-extension-rate tests (CERT) have been performed in ASTM seawater/CO2 in a potential range of -500 to -1100 mVSHE (SHE: standard hydrogen electrode). On steel grades X65 and X70 designed for sour service hydrogen-induced-cracking (HIC) tests to NACE TM0284-2003 were carried out in test solution A and evaluated using an in-house technique which ensures accurate determination of HIC cracking and ranking of steel grades, respectively. The HIC performance of the higher strength grade X80 was also determined for comparison. All steels exhibited an excellent performance with regard to HSCC, in which a variation of HSCC resistance with the steel grade could hardly be observed, and in CERT tests. Grades X65 and X70 revealed a favorable HIC resistance whereas HIC occurred to some extent in grade X80 specimens. The results encourage carrying out further work to develop high strength steels for large-diameter pipes for conditions where hydrogen uptake is likely to occur.

Subject
Hydrogen induced cracking, Materials, Piping, Cathodic potential, Materials performance, Hydrogen charging, Steel, Hydrophobic interaction chromatography, Risk reduction, Blistering, Alloys, Yield strength, Stress corrosion cracking
Keywords:
Sour service, cathodic protection, HSCC, HIC, low alloy steel, large-diameter pipe, SAW, longitudinal weld
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2005
Association for Materials Protection and Performance (AMPP)
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