STEEL PLATE EXCELLENT IN RESISTANCE TO FATIGUE CRACK PROGRESSION

WIPO Patent Application WO/2005/113848

A1

A steel plate, which has a chemical composition, in mass %, that C: 0.01 to 0.10 %, Si: 0.03 to 0.6 %, Mn: 0.3 to 2 %, solAl: 0.001 to 0.1 %, N: 0.0005 to 0.008 %, optionally one or more elements selected from at least one group of a first group to a third group, and the balance: Fe and impurities, and has a metal structure containing, in area %, 30 % or more of a bainite structure, 5 % or less of the sum of a martensite structure and a pearlite srtucture, and the balanced percentage of a ferrite structure; and a method for producing the steel plate. The above steel plate is a steel plate excellent in the resistance to fatigue fracture which is enhanced in the resistance to the progression by a repeated stress of a crack inherent in a welded zone or the like of a welded structure or the like.

KATSUMOTO HIROSHI (JP)
ONISHI KAZUSHI (JP)
KONDA NOBORU (JP)
FUJIWARA KAZUKI (JP)
ARIMOCHI KAZUSHIGE (JP)

PCT/JP2005/009341

December 01, 2005

May 23, 2005

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SUMITOMO METAL IND (JP)
KATSUMOTO HIROSHI (JP)
ONISHI KAZUSHI (JP)
KONDA NOBORU (JP)
FUJIWARA KAZUKI (JP)
ARIMOCHI KAZUSHIGE (JP)

B21B1/38; B21B45/02; B21D1/05; C21D8/02; C21D9/46; C22C38/00; C22C38/06; C22C38/58; (IPC1-7): C22C38/00; B21D1/05; C21D8/02; C22C38/06; C22C38/58

JP2003342673A	2003-12-03
JP2003293089A	2003-10-15
JPH10259448A	1998-09-29
JP2000129392A	2000-05-09
JP3255790B2	2002-02-12
JP2690791B2	1997-12-17
JP2004043961A	2004-02-12

Hirose, Shoichi (4-2 Nihonbashi Honcho 4-cho, Chuo-ku Tokyo 23, JP)

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