Title:
VACUUM CARBURIZATION PROCESSING METHOD, AND METHOD FOR MANUFACTURING CARBURIZED COMPONENT
Document Type and Number:
WIPO Patent Application WO/2019/182140
Kind Code:
A1
Abstract:
In the vacuum carburization processing method according to the present embodiment, when a flow of a carburizing gas, which has been calculated on the basis of a diffusion flux of carbon in a surface layer of a steel material, which is obtained in a diffusion simulation using a diffusion equation, is defined as a theoretical carburizing gas flow (FT), and when the time required for an actual carburizing gas flow to become equal to the theoretical carburizing gas flow after commencement of a carburizing step is defined as an intersection time te, the time from the commencement of the carburizing step until the completion thereof is defined as a carburization time ta, and one-fifth of the carburization time is defined as a reference time ta/5, an early carburizing step (S1) from the commencement of the carburizing step to the intersection time te is performed wherein an actual carburizing gas flow (FR) is set to be equal to or greater than a theoretical carburizing gas flow (FT(te)) at the point where the reference time ta/5 has elapsed from the commencement of the carburizing step, and to be equal to or less than a theoretical carburizing gas flow (FT(20s)) at the point where twenty seconds have elapsed from the commencement of the carburizing step, and a late carburizing step (S2) from the intersection time te until the carburization time ta is performed wherein the actual carburizing gas flow (FR) is set to be within a range of 1.00 to 1.20 times of the theoretical carburizing gas flow (FT).
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Inventors:
TOUDOU SHOUJI (JP)
NAKATANI TAKAYUKI (JP)
IMATAKA HIDEKI (JP)
NAKATANI TAKAYUKI (JP)
IMATAKA HIDEKI (JP)
Application Number:
PCT/JP2019/012211
Publication Date:
September 26, 2019
Filing Date:
March 22, 2019
Export Citation:
Assignee:
NIPPON STEEL CORP (JP)
International Classes:
C23C8/22
Foreign References:
| JP2005350729A | 2005-12-22 | |||
| JP2001081543A | 2001-03-27 | |||
| JP2007113045A | 2007-05-10 |
Attorney, Agent or Firm:
ASCEND IP LAW FIRM (JP)
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