Title:
HIGH-STRENGTH THICK STEEL PLATE HAVING EXCELLENT ARRESTABILITY
Document Type and Number:
WIPO Patent Application WO/2013/150687
Kind Code:
A1
Abstract:
This high-strength thick steel plate has a component composition in which the carbon equivalent (Ceq) is 0.3-0.5% and has a microstructure containing 70% or less of ferrite by area ratio and 30% or more of bainite by area ratio. At 1/4 of the plate thickness, the crystal grain boundary density, which is the total length per unit area of crystal grain boundaries having a crystal orientation difference of 15° or greater, is 400-1000 mm/mm2; and the area ratio of the {100} plane, which forms an angle within 15° with respect to a plane that is perpendicular to the main rolling direction, is 10-40%. At 1/2 of the plate thickness, the crystal grain boundary density is 300-900 mm/mm2; and the area ratio of the {110} plane, which forms an angle within 15° with respect to a plane that is perpendicular to the main rolling direction, is 40-70%.
Inventors:
NAKASHIMA KIYOTAKA (JP)
OKAWA TEPPEI (JP)
OKAWA TEPPEI (JP)
Application Number:
PCT/JP2012/082669
Publication Date:
October 10, 2013
Filing Date:
December 17, 2012
Export Citation:
Assignee:
NIPPON STEEL & SUMITOMO METAL CORP (JP)
International Classes:
C22C38/00; C22C38/58; C21D8/02
Foreign References:
| JP2008169468A | 2008-07-24 | |||
| JP2010031309A | 2010-02-12 | |||
| JP2007302993A | 2007-11-22 |
Attorney, Agent or Firm:
SHIGA Masatake et al. (JP)
Masatake Shiga (JP)
Masatake Shiga (JP)
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