TY - JOUR
T1 - Cracking susceptibility of Ni base alloys and 316 stainless steel in less oxidizing or reducing SCW
AU - Fujisawa, Ryutaro
AU - Nishimura, Kenji
AU - Nishida, Takashi
AU - Sakaihara, Motohiro
AU - Kurata, Yoshiaki
AU - Watanabe, Yutaka
N1 - Funding Information:
This study has been entrusted and financially supported by NEDO (New Energy and Industrial Technology Development Organization).
Publisher Copyright:
© 2005 by NACE International.
PY - 2005
Y1 - 2005
N2 - 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.
AB - 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.
KW - 316 stainless steel
KW - Ni base alloy
KW - Stress corrosion cracking
KW - Supercritical water
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M3 - Conference article
AN - SCOPUS:84991384872
SN - 0361-4409
VL - 2005-April
JO - NACE - International Corrosion Conference Series
JF - NACE - International Corrosion Conference Series
T2 - Corrosion 2005
Y2 - 3 April 2005 through 7 April 2005
ER -