| An evaluation of Hydrogen Induced Cracking (HIC) susceptibility of low alloyed high tensile strength steels with different microstructure were conducted both in a synthetic seawater saturated with H₂S (BP solution) and in an acidified chloride solution saturated with H₂S (NACE solution) at room temperature according to standard test method (NACE TM-02-84). Threshold diffusible hydrogen content (C_(th)) value of each steel was also determined, which was shown to be a consistent indicator in the determination of HIC susceptibility Standard HIC test showed comparatively low reliability due to a wide allowable range of H₂S concentration for the `saturated condition`(2300-3500ppm), which could be compensated by incorporating C_(th) value. Moreover, the C_(th) values determined from cathodic charging of hydrogen agreed well with those determined from the standard test; the method, therefore, is proposed as an easy, reliable method for measuring HIC susceptibility of steels for sour service. |
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