Title:
STEEL PRODUCT EXCELLENT IN CHARACTERISTICS OF RESISTANCE TO FATIGUE CRACK EXTENSION AND METHOD FOR PRODUCTION THEREOF
Document Type and Number:
WIPO Patent Application WO/2004/113581
Kind Code:
A1
Abstract:
A steel product having a structure comprised mainly of a hard phase and being excellent in characteristics of the resistance to fatigue crack extension, wherein it has a structure comprised mainly of ferrite/beinite, and the X-ray diffraction strength pattern thereof from the (110) plane exhibits a peak width at half height of 0.13 degree or more, and wherein it has a chemical composition that C: 0.01 to 0.10 %, Si: 0.03 to 0.6 %, Mn: 0.5 to 2.0 %, sol.Al: 0.005 to 0.10 %, N: 0.0005 to 0.008 % and Ft (3Mn + Cu + 1.5Cr + 1.8Ni + 1.5Mo): 4.0 to 6.0 %, or a chemical composition that B: 0.0030 % or less, Ft: 3.5 to 5.5 % and optionally further contains one or more of Cu, Ni, Cr and Mo; and a method for producing the above steel product which comprises hot rolling and then subjecting the hot-rolled product to a quenching treatment.
Inventors:
FUJIWARA KAZUKI (JP)
KONDA NOBORU (JP)
OKAGUCHI SHUJI (JP)
ARIMOCHI KAZUSHIGE (JP)
KONDA NOBORU (JP)
OKAGUCHI SHUJI (JP)
ARIMOCHI KAZUSHIGE (JP)
Application Number:
PCT/JP2004/008905
Publication Date:
December 29, 2004
Filing Date:
June 18, 2004
Export Citation:
Assignee:
SUMITOMO METAL IND (JP)
FUJIWARA KAZUKI (JP)
KONDA NOBORU (JP)
OKAGUCHI SHUJI (JP)
ARIMOCHI KAZUSHIGE (JP)
FUJIWARA KAZUKI (JP)
KONDA NOBORU (JP)
OKAGUCHI SHUJI (JP)
ARIMOCHI KAZUSHIGE (JP)
International Classes:
C21D1/02; (IPC1-7): C22C38/00; C21D8/02; C22C38/06; C22C38/58
Foreign References:
| JPH08109413A | 1996-04-30 | |||
| JPH08199286A | 1996-08-06 | |||
| JPH0111742A | ||||
| JP2003342673A | 2003-12-03 |
Attorney, Agent or Firm:
Hirose, Shoichi (4-2 Nihonbashi Honcho 4-chome, Chuo-k, Tokyo 23, JP)
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