Title:
STEEL PIPE FOR HIGH-PRESSURE HYDROGEN, CONTAINER FOR HIGH-PRESSURE HYDROGEN, AND METHOD FOR MANUFACTURING SAID STEEL PIPE
Document Type and Number:
WIPO Patent Application WO/2022/209896
Kind Code:
A1
Abstract:
The purpose of the present invention is to provide a steel pipe for high-pressure hydrogen that has high strength and a small fatigue crack growth rate in a range where ΔK regarding fatigue crack growth characteristics is 10 MPa·m1/2 or less. This steel pipe for high-pressure hydrogen has a component composition containing, in mass%, 0.05-0.60% of C, 0.001-2.0% of Si, 0.01-5.0% of Mn, 0.030% or less of P, 0.010% or less of S, 0.010% or less of N, 0.0001-1.00% of Al, 0.010% or less of O, and 0.00010% or less of H, the remainder being Fe and unavoidable impurities, and has a metal structure in which the area fraction of retained austenite is 3% or less (including 0%) and the number of inclusions having an aspect ratio of 2.0 or more and a length of 10 μm or more is 15/100 mm2 or less.
Inventors:
MATSUBARA KAZUKI (JP)
TAKAGI SHUSAKU (JP)
OKANO HIROSHI (JP)
TAKAGI SHUSAKU (JP)
OKANO HIROSHI (JP)
Application Number:
PCT/JP2022/011874
Publication Date:
October 06, 2022
Filing Date:
March 16, 2022
Export Citation:
Assignee:
JFE STEEL CORP (JP)
International Classes:
C22C38/00; C21D8/10; C22C38/06; C22C38/58
Domestic Patent References:
| WO2020137812A1 | 2020-07-02 | |||
| WO2020166637A1 | 2020-08-20 | |||
| WO2018055937A1 | 2018-03-29 |
Foreign References:
| JP2018012855A | 2018-01-25 | |||
| JP2019183218A | 2019-10-24 | |||
| JP2011063840A | 2011-03-31 | |||
| JP2012107332A | 2012-06-07 | |||
| JP2018053357A | 2018-04-05 | |||
| JP2018012855A | 2018-01-25 |
Attorney, Agent or Firm:
KUMASAKA Akira et al. (JP)
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