Title:
TITANIUM ALLOY AND ENGINE EXHAUST PIPES
Document Type and Number:
WIPO Patent Application WO/2007/114218
Kind Code:
A1
Abstract:
The invention provides a titanium material improved in the resistance to high-temperature oxidation at high temperatures exceeding 800°C; and engine exhaust pipes made of the material. The invention relates to a titanium alloy which contains 0.15 to 2% by mass of Si and has an Al content controlled to be less than 0.30% by mass and which has an equiaxial structure of a mean grain size of 15μm or above. The alloy can be further improved in the resistance to high-temperature oxidation at higher temperatures exceeding 800°C, i.e., at 850°C by employing suitable means such as addition of Nb, Mo and/or Cr together with Si, equiaxed grain coarsening, formation of acicular structure, Si enrichment in the outermost surface of the alloy, and/or reduction in the content of impurities such as copper, oxygen and/or carbon.
Inventors:
YASHIKI TAKASHI (JP)
YAMAMOTO KENJI (JP)
YOSHIKAWA EIICHIRO (JP)
YAMAMOTO KENJI (JP)
YOSHIKAWA EIICHIRO (JP)
Application Number:
PCT/JP2007/056799
Publication Date:
October 11, 2007
Filing Date:
March 29, 2007
Export Citation:
Assignee:
KOBE STEEL LTD (JP)
YASHIKI TAKASHI
YAMAMOTO KENJI
YOSHIKAWA EIICHIRO
YASHIKI TAKASHI
YAMAMOTO KENJI
YOSHIKAWA EIICHIRO
International Classes:
C22C14/00; C09D7/12; C23C24/04; F01N13/16; C09D183/04; C09D185/00; C22F1/00; C22F1/18
Foreign References:
| JP2001089821A | 2001-04-03 | |||
| JPH1136029A | 1999-02-09 | |||
| JP2006009115A | 2006-01-12 | |||
| JPH1088258A | 1998-04-07 | |||
| JPH03193850A | 1991-08-23 | |||
| JP2004300569A | 2004-10-28 | |||
| JP2002003968A | 2002-01-09 | |||
| JP2005290448A | 2005-10-20 | |||
| JP2001089883A | 2001-04-03 | |||
| JP2005036311A | 2005-02-10 | |||
| JPH04105659A | 1992-04-07 |
Attorney, Agent or Firm:
TANAKA, Mitsuo et al. (IMP Building 3-7, Shiromi 1-chome, Chuo-ku, Osaka-sh, Osaka 01, JP)
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