Cracking susceptibility of Ni base alloys and 316 stainless steel in less oxidizing or reducing SCW

Ryutaro Fujisawa, Kenji Nishimura, Takashi Nishida, Motohiro Sakaihara, Yoshiaki Kurata, Yutaka Watanabe

Research output: Contribution to journalConference articlepeer-review

10 Citations (Scopus)


The susceptibility of stress corrosion cracking (SCC) of Ni base alloys and 316 stainless steel was studied in less-oxidizing or reducing supercritical water (SCW) environments for determining the suitability of these alloys in the upgrading of low-quality hydrocarbon resources process. The cracking susceptibility of 316 stainless steel, UNS N06625(Alloy 625), UNS N10276(Alloy C-276) and MC-alloy (Ni-45CrlMo) was investigated using slow strain rate test (SSRT) in supercritical water containing hydrogen chloride. All tests were performed at 400°C/25MPa. SCC did not occur in the deionized water at 400C°/25MPa. In less-oxidizing SCW with 0.001mol/l HC1, cracking occurred in type 316 stainless steel. With 0.001mol/lHCl, cracking occurred in Alloy C-276. With 0.01mol/l HC1, cracking occurred on Alloy 625. But SCC of MC alloy did not occur at these conditions. Cracking susceptibility of Ni base alloys decreased with increasing Cr content of alloys in less-oxidizing SCW containing HC1. In reducing atmosphere, the susceptibilities of SCC of these alloys were decreased with increasing hydrogen gas partial pressure.

Original languageEnglish
JournalNACE - International Corrosion Conference Series
Publication statusPublished - 2005
EventCorrosion 2005 - Houston, United States
Duration: 2005 Apr 32005 Apr 7


  • 316 stainless steel
  • Ni base alloy
  • Stress corrosion cracking
  • Supercritical water

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Science(all)


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