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Journal of KWJS. 2005;23(3):34-39. Published online July 15, 2005.
- Evaluation of HIC Resistance for Thick-wall Welded Pipe
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JunSeok Seo, HeeJin Kim, Hoi-Soo Ryoo
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- Abstract
- It is required for the steel used in the sour environment to have sufficient to hydrogen induced cracking(HIC). For pipe steels, HIC resistance could be varied during making process due to the large plastic deformation applied in the thick-wall pipe. In order to figure out such effect, HIC tests were performed not only in the plate condition but in the pipe condition and their results were compared in terms of cracking ratio. Test results demonstrated a detreimental effect of plastic deformation to HIC resulting in a substantial in the cracking ratio after pipe forming process. All of the cracks found in the pipe material were located in the outer of pipe where the tensile was resulted during pipe forming stage. In order to understand HIC resistance of the pipe but in the plate condition, it was suggested to pre-strain the plate to some extent before the HIC test.
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