Title:
溶接熱影響部のCTOD特性が優れた鋼およびその製造方法
Document Type and Number:
Japanese Patent JP4547037
Kind Code:
B2
Abstract:
The present invention provides high strength steel having unprecedentedly superior CTOD (fracture toughness) properties satisfying not only the CTOD properties of the FL zone at -60°C, but also the CTOD properties of the ICHAZ zone in small and medium heat input multilayer welding etc. and a method of production of the same. The steel of the present invention is steel superior in CTOD properties of the heat-affected zone containing, by mass%, C: 0.015 to 0.045%, Si: 0.05 to 0.2%, Mn: 1.5 to 2.0%, Cu: 0.25 to 0.5%, Ni: 0.7 to 1.5%, P: 0.008% or less, S: 0.005% or less, Al: 0.004% or less, Ti: 0.005 to 0.015%, Nb: 0.005% or less, O: 0.0015 to 0.0035%, and N: 0.002 to 0.006%, P CTOD : 0.065 or less, CeqH: 0.235 or less and the balance consisting of Fe and unavoidable impurities.
Inventors:
Chizuiwa Rikio
Ryuji Uemori
Yoshiyuki Watanabe
Fukunaga Kazuhiro
Akihiko Kojima
Yoshihide Nagai
Ryuji Uemori
Yoshiyuki Watanabe
Fukunaga Kazuhiro
Akihiko Kojima
Yoshihide Nagai
Application Number:
JP2009507260A
Publication Date:
September 22, 2010
Filing Date:
December 04, 2008
Export Citation:
Assignee:
Nippon Steel Corporation
International Classes:
C22C38/00; B21B3/00; B22D11/00; C21D8/02; C22C38/16
Domestic Patent References:
| JPS62240747A | 1987-10-21 | |||
| JP2007002271A | 2007-01-11 | |||
| JPH01159356A | 1989-06-22 | |||
| JPH04103742A | 1992-04-06 | |||
| JPH07278653A | 1995-10-24 |
Attorney, Agent or Firm:
Atsushi Aoki
Takashi Ishida
Tetsuji Koga
Hiroshi Kamematsu
Nakamura Asayuki
Nagasaka Tomoyasu
Takashi Ishida
Tetsuji Koga
Hiroshi Kamematsu
Nakamura Asayuki
Nagasaka Tomoyasu