Title:
AUTOMOTIVE UNDERBODY PART HAVING EXCELLENT LOW CYCLE FATIGUE PROPERTIES, AND PROCESS FOR PRODUCTION THEREOF
Document Type and Number:
WIPO Patent Application WO/2011/145234
Kind Code:
A1
Abstract:
Disclosed is an automotive underbody part having excellent low cycle fatigue properties. The automotive underbody part is characterized by comprising a steel which comprises (in mass%) 0.02-0.10% of C, 0.05-1.0% of Si, 0.3-2.5% of Mn, 0.03% or less of P, 0.01% or less of S, 0.005-0.1% of Ti, 0.005-0.1% of Al, 0.0005-0.006% of N, 0.0001-0.01% of B and the remainder made up by Fe and unavoidable impurities, wherein 80% or more of the structure of the automotive underbody part is made up by a steel having a bainite structure. The automotive underbody part is also characterized in that the X-ray half value width of the face (211) of a part of the automotive underbody part which has a ratio of the thickness (t) to the curvature radius (R) of the outside surface (i.e., an R/t ratio) of 5 or less is 5 (deg) or less.
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Inventors:
FUKUSHI TAKAAKI (JP)
NAKAMURA HIDEYUKI (JP)
ANAI ISAO (JP)
NAKAMURA HIDEYUKI (JP)
ANAI ISAO (JP)
Application Number:
PCT/JP2010/071526
Publication Date:
November 24, 2011
Filing Date:
November 25, 2010
Export Citation:
Assignee:
NIPPON STEEL CORP (JP)
FUKUSHI TAKAAKI (JP)
NAKAMURA HIDEYUKI (JP)
ANAI ISAO (JP)
FUKUSHI TAKAAKI (JP)
NAKAMURA HIDEYUKI (JP)
ANAI ISAO (JP)
International Classes:
C22C38/14; B21C37/08; B21D5/12; B21D53/88; C21D9/46; C22C38/58
Foreign References:
| JP2009270142A | 2009-11-19 | |||
| JP2008013808A | 2008-01-24 | |||
| JPH09267123A | 1997-10-14 | |||
| JP2008095156A | 2008-04-24 | |||
| JP2010242164A | 2010-10-28 | |||
| JP2001321846A | 2001-11-20 | |||
| JP2008063656A | 2008-03-21 |
Other References:
See also references of EP 2573200A4
Attorney, Agent or Firm:
AOKI, Atsushi et al. (JP)
Aoki 篤 (JP)
Aoki 篤 (JP)
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Claims: