Title:
STEEL PRODUCT FOR CARGO OIL TANK
Document Type and Number:
WIPO Patent Application WO/2005/100625
Kind Code:
A1
Abstract:
A steel product for a cargo oil tank which has a chemical composition containing C: 0.01 to 0.2 %, Si: 0.01 to 1 %, Mn: 0.05 to 2 %, P: 0.05 % or less, S: 0.01 % or less, Ni: 0.01 to 1 %, Cu: 0.05 to 2 %, W: 0.01 to 1 %, Cr: 0.1 % or less, Al: 0.1 % or less, N: 0.001 to 0.01 %, and O (oxygen):0.0001 to 0.005 %. Preferably, &agr and β, both being shown in the following, are 0.75 or less and 0.8 or less, respectively, and Ceq* represented by the formula (1) is 0.38 or less. &agr = (1-0.691×Cu)×(1-0.221×Ni)×(1-0.142×W) β = (1-0.444×Cu)×(1-0.156×Ni)×(1-0.630×W) Ceq* = C +Mn/6 + Ni/15 + Cu/15 + W/10 + Cr/5 + Mo/5 ----(1) The above steel product for a cargo oil tank is excellent in the resistance to the corrosion over the whole of the surface or at a part of the surface under a circumstance of the corrosion by a crude oil and sea water, and also is excellent in the toughness of both of the mother material and a welded zone.
Inventors:
KASHIMA KAZUYUKI (JP)
MIYUKI HIDEAKI (JP)
MIYUKI HIDEAKI (JP)
Application Number:
PCT/JP2005/007018
Publication Date:
October 27, 2005
Filing Date:
April 11, 2005
Export Citation:
Assignee:
SUMITOMO METAL IND (JP)
KASHIMA KAZUYUKI (JP)
MIYUKI HIDEAKI (JP)
KASHIMA KAZUYUKI (JP)
MIYUKI HIDEAKI (JP)
International Classes:
B63B59/00; C21D7/13; C21D8/00; C21D8/02; C22C38/00; C22C38/58; C22C38/60; (IPC1-7): C22C38/00; C21D8/02; C22C38/58
Foreign References:
| JP2003082435A | 2003-03-19 | |||
| JP2924584B2 | 1999-07-26 | |||
| JPH0734272A | 1995-02-03 | |||
| JPS5113099B2 | 1976-04-24 | |||
| JP2004204344A | 2004-07-22 | |||
| JPS5113100B2 | 1976-04-24 | |||
| JPH07267182A | 1995-10-17 | |||
| JPH09165647A | 1997-06-24 | |||
| JP2003313633A | 2003-11-06 |
Attorney, Agent or Firm:
Hirose, Shoichi (4-2 Nihonbashi Honcho 4-chom, Chuo-ku Tokyo 23, JP)
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