Title:
FORGED CRANKSHAFT
Document Type and Number:
WIPO Patent Application WO/2011/158782
Kind Code:
A1
Abstract:
Provided is a forged crankshaft having excellent wear resistance. The forged crankshaft is constituted of a non-heat-treated steel material. The non-heat-treated steel material has a chemical composition which contains, in terms of mass%, 0.45-0.70% C, 0.75-1.30% Si, 1.00-2.00% Mn, 0.03-0.30% S, 0.05-0.30% Cr, 0.005-0.050% Al, and 0.005-0.020% N, with the remainder comprising Fe and impurities, and which satisfies relationship (1). The matrix of the non-heat-treated steel material comprises a ferrite-pearlite structure or pearlite structure which has a pro-eutectoid ferrite content less than 10% in terms of areal proportion.
1.1C+Mn+0.2Cr>2.0 (1)
In relationship (1), the contents (mass%) of the respective elements are substituted for the atomic symbols.
Inventors:
KIM KISUNG (JP)
TAHIRA HIROAKI (JP)
MAEJIMA TAKETO (JP)
TAHIRA HIROAKI (JP)
MAEJIMA TAKETO (JP)
Application Number:
PCT/JP2011/063490
Publication Date:
December 22, 2011
Filing Date:
June 13, 2011
Export Citation:
Assignee:
SUMITOMO METAL IND (JP)
KIM KISUNG (JP)
TAHIRA HIROAKI (JP)
MAEJIMA TAKETO (JP)
KIM KISUNG (JP)
TAHIRA HIROAKI (JP)
MAEJIMA TAKETO (JP)
International Classes:
C22C38/00; C22C38/60; F16C3/08
Foreign References:
| JP2005264265A | 2005-09-29 | |||
| JP2005314756A | 2005-11-10 | |||
| JP2006328513A | 2006-12-07 | |||
| JP2008056956A | 2008-03-13 |
Attorney, Agent or Firm:
UEBA Hidetoshi et al. (JP)
Hidetoshi Ueha (JP)
Hidetoshi Ueha (JP)
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Claims:
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