Title:
CARBURIZED COMPONENT
Document Type and Number:
WIPO Patent Application WO/2014/034150
Kind Code:
A1
Abstract:
The present invention provides a carburized component that is manufactured by vacuum carburization and demonstrates exceptional bending fatigue strength in an edge section and a flat section. This carburized component is manufactured by vacuum carburizing steel. The outer surface of the carburized component includes a top section, the edge section, and the flat section. The steel contains 0.10 to 0.30% of C, 0.05 to 0.8% of Si, 0.3 to 2.0% of Mn, 0.06% or less of P, 0.006 to 0.1% of S, 0.5 to 3.0% of Cr, 0.01 to 0.1% of Al, 0.025% or less of N, 0 to 0.5% of Cu, 0 to 0.5% of Ni, and 0 to 1.0% of Mo, the remainder comprising Fe and impurities (all amounts representing percentage by mass). The carbon concentration in a flat surface layer section down to 0.05 mm from the flat section is 0.7% to less than 1.0% by mass, and an edge surface layer section down to 80 μm from the edge section contains one or more cementites having a length of 3.0 μm or less, the cementite fraction in the edge section being 5 to 15%.
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Inventors:
TOUDOU SHOUJI (JP)
OHASHI TETSUYA (JP)
IMATAKA HIDEKI (JP)
SUENO HIDEKAZU (JP)
OHASHI TETSUYA (JP)
IMATAKA HIDEKI (JP)
SUENO HIDEKAZU (JP)
Application Number:
PCT/JP2013/005181
Publication Date:
March 06, 2014
Filing Date:
September 02, 2013
Export Citation:
Assignee:
NIPPON STEEL & SUMITOMO METAL CORP (JP)
International Classes:
C22C38/00; C21D1/06; C21D6/00; C21D9/32; C22C38/60; C23C8/22
Domestic Patent References:
| WO2011132722A1 | 2011-10-27 |
Foreign References:
| JP2004076125A | 2004-03-11 | |||
| JP2007291486A | 2007-11-08 | |||
| JPH083720A | 1996-01-09 | |||
| JP2007308772A | 2007-11-29 |
Attorney, Agent or Firm:
M. MORI PATENT FIRM (JP)
Patent business corporation Woods Michio patent firm (JP)
Patent business corporation Woods Michio patent firm (JP)
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