Microhardness profiles and hydrogen induced cracking of flexible armor steel wires in H2S environments

Jonas S. Sá, Eduardo A. Souza, Emanuel S.N. Filho, José A.C.P. Gomes

Research output: Contribution to journalConference articlepeer-review

Abstract

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.

Original languageEnglish
Article number13368
JournalNACE - International Corrosion Conference Series
Volume2019-March
Publication statusPublished - 2019
Externally publishedYes
EventCorrosion Conference and Expo 2019 - Nashville, United States
Duration: 24 Mar 201928 Mar 2019

Keywords

  • Flexible pipe
  • Hydrogen
  • Hydrogen sulfide
  • Steel

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