Title:
HIGH-STRENGTH STEEL SHEET FOR HYDROGEN TRANSPORT STEEL PIPE, MANUFACTURING METHOD THEREFOR, AND HYDROGEN TRANSPORT STEEL PIPE
Document Type and Number:
WIPO Patent Application WO/2024/014098
Kind Code:
A1
Abstract:
Provided is a high-strength steel sheet for a hydrogen transport steel pipe, the high-strength steel sheet having excellent HISC resistance and fatigue crack growth resistance in a high-pressure hydrogen environment. A high-strength steel sheet for a hydrogen transport steel pipe according to the present invention contains, in terms of mass%, 0.030-0.060% of C, 0.01-0.50% of Si, 0.80-1.80% of Mn, at most 0.015% of P, at most 0.0015% of S, 0.010-0.080% of Al, 0.05-0.50% of Cr, 0.005-0.080% of Nb, 0.005-0.020% of Ti, 0.0020-0.0080% of N, and 0.0005-0.0050% of Ca, wherein: the average Vickers hardness value at a position 0.25 mm downward from the surface of the steel sheet+3σ is at most 225 HV; the top 20% particle diameter in the center structure in the sheet thickness is at most 30 μm; the fatigue crack growth rate when the stress intensity factor range ∆K is 45 (MPa∙m1/2) is less than 2.0×10-2 (mm/cycle); and the tensile strength is at least 535 MPa.
Inventors:
IZUMI DAICHI (JP)
NISHIHARA YOSHIHIRO (JP)
OKANO HIROSHI (JP)
SHIMAMURA JUNJI (JP)
NISHIHARA YOSHIHIRO (JP)
OKANO HIROSHI (JP)
SHIMAMURA JUNJI (JP)
Application Number:
PCT/JP2023/017743
Publication Date:
January 18, 2024
Filing Date:
May 11, 2023
Export Citation:
Assignee:
JFE STEEL CORP (JP)
International Classes:
C22C38/00; C21D8/02; C22C38/38; C22C38/58
Domestic Patent References:
| WO2020137812A1 | 2020-07-02 | |||
| WO2021020220A1 | 2021-02-04 | |||
| WO2020067209A1 | 2020-04-02 |
Attorney, Agent or Firm:
KUMASAKA Akira et al. (JP)
Download PDF:
Previous Patent: BATTERY CELL AND BATTERY MODULE
Next Patent: CERAMIC ELECTRONIC COMPONENT AND METHOD FOR MANUFACTURING SAME
Next Patent: CERAMIC ELECTRONIC COMPONENT AND METHOD FOR MANUFACTURING SAME