Title:
HIGH TENSILE STEEL PLATE HAVING EXCELLENT LOW-TEMPERATURE TOUGHNESS IN WELD HEAT-AFFECTED ZONES, AND METHOD FOR PRODUCING SAME
Document Type and Number:
WIPO Patent Application WO/2013/118313
Kind Code:
A1
Abstract:
Provided are a high tensile steel plate having excellent low-temperature toughness (CTOD characteristics) in a multi-layer weld, and a method for producing same. More specifically, a high tensile steel plate which has a component composition that contains, in terms of mass percentage, 0.03-0.12% of C, 0.01-0.30% of Si, 0.5-1.95% of Mn, 0.008% or less of P, 0.005% or less of S, 0.015-0.06% of Al, 0.011-0.05% of Nb, 0.005-0.02% of Ti, 0.001-0.006% of N, 0.0005-0.003% of Ca and, if necessary, one or more elements selected from among Cr, Mo, V, Cu and Ni, wherein the Ceq value is 0.44 or lower, the Ti/N ratio is 1.5-3.5 and a parameter equation comprising specific elements is satisfied in order to control sulfide forms and the degree of center segregation in the steel, with the remainder comprising Fe and unavoidable impurities, and in which the hardness of a center segregation part in the steel plate is specified.
Inventors:
YUGA MASAO (JP)
KITSUYA SHIGEKI (JP)
TERAZAWA YUSUKE (JP)
SUWA MINORU (JP)
HAYASHI KENJI (JP)
KITSUYA SHIGEKI (JP)
TERAZAWA YUSUKE (JP)
SUWA MINORU (JP)
HAYASHI KENJI (JP)
Application Number:
PCT/JP2012/055890
Publication Date:
August 15, 2013
Filing Date:
March 01, 2012
Export Citation:
Assignee:
JFE STEEL CORP (JP)
YUGA MASAO (JP)
KITSUYA SHIGEKI (JP)
TERAZAWA YUSUKE (JP)
SUWA MINORU (JP)
HAYASHI KENJI (JP)
YUGA MASAO (JP)
KITSUYA SHIGEKI (JP)
TERAZAWA YUSUKE (JP)
SUWA MINORU (JP)
HAYASHI KENJI (JP)
International Classes:
C22C38/14; C21D8/02; C22C38/58
Domestic Patent References:
| WO2009123292A1 | 2009-10-08 |
Foreign References:
| JP2007231312A | 2007-09-13 | |||
| JP2009221534A | 2009-10-01 | |||
| JP2009235458A | 2009-10-15 | |||
| JP2009185343A | 2009-08-20 | |||
| JP3053367B2 | 2000-06-19 | |||
| JPS60184663A | 1985-09-20 | |||
| JP2003147484A | 2003-05-21 | |||
| JPS5186823A | 1976-07-29 | |||
| JP2001335884A | 2001-12-04 |
Other References:
See also references of EP 2813596A4
Attorney, Agent or Firm:
OCHIAI, Kenichiro (JP)
Ken-ichiro Ochiai (JP)
Ken-ichiro Ochiai (JP)
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Claims: