Title:
GAS-CARBURIZED STEEL COMPONENT WITH EXCELLENT SURFACE FATIGUE STRENGTH, GAS-CARBURIZING STEEL MATERIAL, AND PROCESS FOR PRODUCING GAS-CARBURIZED STEEL COMPONENT
Document Type and Number:
WIPO Patent Application WO/2012/077705
Kind Code:
A1
Abstract:
A gas-carburizing steel material which is to be used in producing a carburized steel component, wherein the base metal has a composition that contains, by mass, 0.1 to 0.4% of C, more than 1.2 to 4.0% of Si, 0.2 to 3.0% of Mn, 0.5 to 5.0% of Cr, 0.005 to 0.1% of Al, 0.001 to 0.3% of S, and 0.003 to 0.03% of N, with the contents of O and P being limited to at most 0.0050% and at most 0.025% respectively, and that satisfies relationship (1) [wherein [Si%], [Mn%] and [Cr%] represent the contents (in mass%) of Si, Mn and Cr respectively], and an alloy-deficient layer satisfying relationship (2) is present within the region from the surface to a depth of 2 to 50μm.
32 ≥ 3.5[Si%] + [Mn%] + 3[Cr%] > 9 ··· (1)
3.5[Si%] + [Mn%] + 3[Cr%] ≤ 9 ··· (2)
Inventors:
KOYAMA TATSUYA (JP)
KUBOTA MANABU (JP)
KUBOTA MANABU (JP)
Application Number:
PCT/JP2011/078275
Publication Date:
June 14, 2012
Filing Date:
December 07, 2011
Export Citation:
Assignee:
NIPPON STEEL CORP (JP)
KOYAMA TATSUYA (JP)
KUBOTA MANABU (JP)
KOYAMA TATSUYA (JP)
KUBOTA MANABU (JP)
International Classes:
C22C38/00; C21D1/06; C22C38/60; C23C8/22; C21D1/32; C21D1/76; C21D6/00
Domestic Patent References:
| WO2010116670A1 | 2010-10-14 |
Foreign References:
| JP2005048270A | 2005-02-24 | |||
| JPH06145897A | 1994-05-27 | |||
| JP2003268497A | 2003-09-25 |
Attorney, Agent or Firm:
HAGIWARA, Yasushi et al. (JP)
Yasushi Hagiwara (JP)
Yasushi Hagiwara (JP)
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