Metals and Materials International

, Volume 18, Issue 4, pp 613–617 | Cite as

Influence of Ti addition on the hydrogen induced cracking of API 5L X70 hot-rolled pipeline steel in acid sour media

  • Joonoh MoonEmail author
  • Chulbong Park
  • Seong-Ju Kim


In this study, Hydrogen Induced Cracking (HIC) testing of high strength API 5L grade X70 linepipe hot rolled steel containing Ti was performed to investigate the effects of (Nb, Ti, V)(C, N) particles on HIC susceptibility. By controlling chemical composition and hot rolling parameters, experimental steel with Bainitic ferrite and Bainite microstructures was fabricated. HIC testing was carried out within an acidic condition (pH=2.7±0.1) according to NACE standards with test results showing cracking propagated along coarse (Nb, Ti, V)(C, N) particles at mid-thickness. This is mainly due to centerline segregation and hydrogen blistering between matrix and coarse (Nb, Ti, V)(C, N) particles without external stress.

Key words

metals rolling corrosion precipitation hydrogen 


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Copyright information

© The Korean Institute of Metals and Materials and Springer Netherlands 2012

Authors and Affiliations

  1. 1.Ferrous Alloy Department, Advanced Metallic Materials DivisionKorea Institute of Materials ScienceGyeongnamKorea
  2. 2.Sheet Products Design Team, Technical Research CenterHyundai Steel CompanyChungnamKorea

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