Hydrogen induced cracking (HIC) tests of flexible pipe pressure and tensile armor wires were carried out in a H2S-containing environment in order to assess the resistance to cracking. Tests were carried out in substitute ocean water solution, constantly bubbled with 1%H2S/N2 mixture for different duration in order to investigate crack growth. After each test specimens were ultrasonic inspected for internal cracks. Specimen was sectioned at any region with crack indications and the cross section was observed for internal cracks. HIC parameters were measured and associated with microstructure and hardness profile. Results showed that HIC susceptibility is related to the hardness. Regions with higher hardness had a higher tendency for crack initiation.

Subject
Hydrogen induced cracking, Marine environments, Materials, Microstructure, Wiring, Optical microscopy, Acidity, Solutions, Steel, Hydrophobic interaction chromatography, Hardness, Hydrogen, Inclusions
Keywords:
hydrogen, steel, flexible pipe, hydrogen sulfide
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2019
Association for Materials Protection and Performance (AMPP)
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