Title:
THICK STEEL SHEET HAVING SUPERIOR FATIGUE RESISTANCE PROPERTIES IN SHEET THICKNESS DIRECTION, METHOD FOR PRODUCING SAME, AND FILLET WELDED JOINT USING SAID THICK STEEL SHEET
Document Type and Number:
WIPO Patent Application WO/2012/133872
Kind Code:
A1
Abstract:
Provided are: a thick steel sheet that has superior fatigue resistance properties in the direction of sheet thickness and that is favorable for a welded steel structure of a pressure vessel or the like; a method for producing the thick steel sheet; and a fillet welded joint that uses the thick steel sheet. Specifically, the thick steel sheet has an aggregate structure having an x-ray intensity ratio of at least 2.0 in the (110) plane parallel to the sheet surface in at least the range from the position 2 mm in the direction of sheet thickness from one or both of the rolled surfaces of the steel sheet to the 3/10 position of the sheet thickness, and has a structure having an average value for the compressive remaining stress in the direction of sheet thickness of at least 160 MPa, having an x-ray intensity ratio in the (100) plane parallel to the sheet surface of no greater than 1.1, and containing: C, Si, and Mn; Ti and/or Nb; and, as needed, one or at least two of Cu, Ni, Cr, Mo, V, W, Zr, B, and Al, the remainder comprising Fe and unavoidable impurities.
Inventors:
HANDA TSUNEHISA (JP)
IGI SATOSHI (JP)
ENDO SHIGERU (JP)
IGI SATOSHI (JP)
ENDO SHIGERU (JP)
Application Number:
PCT/JP2012/058780
Publication Date:
October 04, 2012
Filing Date:
March 27, 2012
Export Citation:
Assignee:
JFE STEEL CORP (JP)
HANDA TSUNEHISA (JP)
IGI SATOSHI (JP)
ENDO SHIGERU (JP)
HANDA TSUNEHISA (JP)
IGI SATOSHI (JP)
ENDO SHIGERU (JP)
International Classes:
C22C38/00; B23K9/02; B23K9/23; C21D8/02; C22C38/14; C22C38/58
Foreign References:
| JPH08253821A | 1996-10-01 | |||
| JP2010242211A | 2010-10-28 | |||
| JP2010159473A | 2010-07-22 | |||
| JP2009263777A | 2009-11-12 | |||
| JP2001226739A | 2001-08-21 | |||
| JP2010084170A | 2010-04-15 | |||
| JP2010236047A | 2010-10-21 | |||
| JP2007056348A | 2007-03-08 |
Attorney, Agent or Firm:
OCHIAI, Kenichiro (JP)
Ken-ichiro Ochiai (JP)
Ken-ichiro Ochiai (JP)
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Claims: