Title:
METHOD FOR DETERMINING FATIGUE CRACK LIFE IN HIGH-PRESSURE HYDROGEN ENVIRONMENT
Document Type and Number:
WIPO Patent Application WO/2012/121106
Kind Code:
A1
Abstract:
A method for determining the fatigue crack life which a low-alloy steel will have at a high hydrogen pressure of 90 MPa or less, the method comprising subjecting the low-alloy steel to a rising load test in a high-pressure hydrogen environment to obtain a crack-growth threshold stress intensity factor KIH-R, presuming the fatigue-crack acceleration initiation point Kmax
T of the low-alloy steel from the KIH-R, and conducting a fatigue crack life analysis on the basis of the Kmax
T and the fatigue crack growth characteristics in high-pressure hydrogen of the low-alloy steel to determine the fatigue crack life. The high-pressure hydrogen environment used in the rising load test has the same pressure as the high-pressure hydrogen environment for which the Kmax
T is presumed. The rising load test is conducted under the conditions of a temperature tolerance of ±5ºC.
Inventors:
WADA YORU
Application Number:
PCT/JP2012/055243
Publication Date:
September 13, 2012
Filing Date:
March 01, 2012
Export Citation:
Assignee:
JAPAN STEEL WORKS LTD (JP)
WADA YORU
WADA YORU
International Classes:
G01N17/00
Foreign References:
| JP2005024371A | 2005-01-27 | |||
| JP2009025213A | 2009-02-05 |
Other References:
YOSHIKUNI MURAKAMI ET AL.: "Rising load test method to evaluate hydrogen embrittlement susceptibility of Cr-Mo steel", JOURNAL OF THE IRON & STEEL INSTITUTE OF JAPAN, vol. 70, no. 5, 5 March 1984 (1984-03-05), pages S639, XP008169030
TAKAO AOKI ET AL.: "Atsuryoku Yokiko no Suiso Zeika Kanjusei Hyoka ni Okeru Shomondai", NIPPON ZAIRYO KYODO GAKKAI GAKUJUTSU KOENKAI RONBUNSHU, 16 June 1988 (1988-06-16), pages 49 - 52, XP008172326
See also references of EP 2682740A4
TAKESHI KUNIO; HAJIME NAKAZAWA; IKUHIKO HAYASHI: "Fracture mechanics laboratory procedure", 1984, ASAKURA SHOTEN, article "Hiroyuki OKAMURA", pages: 250
"KHK(S) 0220(2004", 2004, THE HIGH PRESSURE GAS SAFETY INSTITUTE OF JAPAN, article "Standard of ultrahigh-pressure gas installations", pages: 173 - 174
TAKAO AOKI ET AL.: "Atsuryoku Yokiko no Suiso Zeika Kanjusei Hyoka ni Okeru Shomondai", NIPPON ZAIRYO KYODO GAKKAI GAKUJUTSU KOENKAI RONBUNSHU, 16 June 1988 (1988-06-16), pages 49 - 52, XP008172326
See also references of EP 2682740A4
TAKESHI KUNIO; HAJIME NAKAZAWA; IKUHIKO HAYASHI: "Fracture mechanics laboratory procedure", 1984, ASAKURA SHOTEN, article "Hiroyuki OKAMURA", pages: 250
"KHK(S) 0220(2004", 2004, THE HIGH PRESSURE GAS SAFETY INSTITUTE OF JAPAN, article "Standard of ultrahigh-pressure gas installations", pages: 173 - 174
Attorney, Agent or Firm:
OGURI Shohei et al. (JP)
Shohei Oguri (JP)
Shohei Oguri (JP)
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Claims:
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