Title:
STEEL MATERIAL FOR CRUDE OIL TANK
Document Type and Number:
WIPO Patent Application WO/2023/162896
Kind Code:
A1
Abstract:
In the present invention, a steel for a crude oil tank has a chemical composition containing, by mass, 0.03-0.20% of C, 0.05-0.50% of Si, 0.60-2.00% of Mn, 0.030% or less of P, 0.030% or less of S, 0.001-0.050% of Al, and 0.001-0.010% of N, and additionally containing one or more elements selected from 0.01-0.60% of Cu, 0.01-0.20% of Mo, 0.01-0.20% of W, 0.01-0.20% of Sn, and 0.01-0.20% of Sb, with the remainder being Fe and impurities. [Cu+6×Mo+2×W+0.5×Sn+0.5×Sb] is 0.50 or above. In the metal structure in a cross-section parallel to the thickness direction and the rolling direction, the total area ratio of bainite and/or acicular ferrite is 20-95% and the area ratio of martensite is 2.0% or less, and the Vickers hardness is 210 HV10 or less.
Inventors:
ITO MINORU (JP)
KASHIMA KAZUYUKI (JP)
KANEKO MICHIO (JP)
NAKAI KEISUKE (JP)
IMAJO DAIKI (JP)
YONEZAWA TAKAYUKI (JP)
KASHIMA KAZUYUKI (JP)
KANEKO MICHIO (JP)
NAKAI KEISUKE (JP)
IMAJO DAIKI (JP)
YONEZAWA TAKAYUKI (JP)
Application Number:
PCT/JP2023/005840
Publication Date:
August 31, 2023
Filing Date:
February 17, 2023
Export Citation:
Assignee:
NIPPON STEEL CORP (JP)
International Classes:
C21D8/02; C22C38/00; C22C38/60
Domestic Patent References:
| WO2020184683A1 | 2020-09-17 |
Foreign References:
| JP2010196166A | 2010-09-09 | |||
| JP2010222665A | 2010-10-07 | |||
| JP2019131840A | 2019-08-08 |
Attorney, Agent or Firm:
BRIGHTAS IP ATTORNEYS (JP)
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