Effects of Hydrogen and Pre-strain on Tensile Properties of Carbon Steel STPG370 (0.19 C-0.21 Si-0.56Mn, mass%) for 1 MPa Hydrogen Pipelines

Shi Nishiguchi, Hihiro Fukushima, Saburo Matsuoka, Yukitaka Murakami

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Abstract

The effects of hydrogen and pre-strain on tensile properties of JIS-STPG 370 carbon steel pipe for hydrogen pipelines were investigated. In order to pre-charge hydrogen, the specimens were immersed in a 20 mass% aqueous solution of ammonium thiocyanate at 313 Κfor 48 h. The hydrogen content increased with increasing the pre-strain. The reduction of area of hydrogen-charged specimens decreased with pre-strain. Although pearlite cracks were formed both in the uncharged and hydrogen-charged specimens, the initiation of pearlite cracks occurred at the lower true strain in the hydrogen-charged specimen. Furthermore, the pearlite cracks grew in the direction perpendic-ular to the loading axis in the hydrogen-charged specimen. The experimental evidences are shown to explain the mechanism of the initiation and growth of pearlite cracks in the hydrogen-charged specimen by the hydrogen enhanced localized plasticity model rather than the lattice decohesion model.

Original languageEnglish
Pages (from-to)1016-1025
Number of pages10
JournalNihon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A
Volume74
Issue number743
DOIs
Publication statusPublished - Jan 1 2008

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All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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