Title:
THICK STEEL PLATE AND PRODUCTION METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2018/034071
Kind Code:
A1
Abstract:
A thick steel plate including 0.02%–0.10% by mass C, 1.0%–2.0% by mass Mn, 0%–0.05% by mass Nb, 0%–0.05% by mass Ti, 0.01%–0.06% by mass Al, 0.1%–0.6% by mass Si, and 0.1%–0.6% by mass Cu. The total Si and Cu content is at least 0.3% by mass, with the remainder being iron and unavoidable impurities. The processed ferrite fraction is at least 50% by area ratio; the effective crystal grain size of crystal grains is no more than 30 µm; the martensite–austenite mixed phase is no more than 5% by area ratio; and the dislocation density ρ value measured by X-ray diffraction is 1.0 × 1014 m–2 – 2.5 × 1015 m–2.
Inventors:
SUGITANI KAZUYA
SANDAIJI YUSUKE
KINEFUCHI MASAO
YAMAGUCHI TETSUO
TONAN TOMOYUKI
SANDAIJI YUSUKE
KINEFUCHI MASAO
YAMAGUCHI TETSUO
TONAN TOMOYUKI
Application Number:
PCT/JP2017/024522
Publication Date:
February 22, 2018
Filing Date:
July 04, 2017
Export Citation:
Assignee:
KOBE STEEL LTD (JP)
International Classes:
C22C38/00; B21B1/38; C21D8/02; C22C38/16; C22C38/58
Domestic Patent References:
| WO2015178320A1 | 2015-11-26 |
Foreign References:
| JP2003239036A | 2003-08-27 | |||
| JPH111742A | 1999-01-06 |
Other References:
See also references of EP 3502295A4
Attorney, Agent or Firm:
SAMEJIMA, Mutsumi et al. (JP)
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