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Patent Searching and Data


Title:
CARBURIZATION METHOD
Document Type and Number:
WIPO Patent Application WO/2019/087619
Kind Code:
A1
Abstract:
The carburization method has: a carburization step where a carbon steel treatment object is carburized; and a diffusion step for carrying out a diffusion treatment where carbon injected into the surface of the treatment object in the carburization step is diffused into the interior of the treatment object. This carburization method raises, as the surface carbon concentration of the treatment object decreases due to the internal diffusion of carbon, the diffusion treatment temperature continuously or in stages during the diffusion step within a temperature range higher than the carburization treatment temperature but lower than the solidus of γFe at the decreased surface carbon concentration in the equilibrium diagram of carbon steel.

Inventors:
KITA TAKUYA (JP)
Application Number:
PCT/JP2018/035314
Publication Date:
May 09, 2019
Filing Date:
September 25, 2018
Export Citation:
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Assignee:
DENSO CORP (JP)
International Classes:
C23C8/80; C21D1/06; C23C8/22
Foreign References:
JPH01234553A1989-09-19
JP2001098343A2001-04-10
JPS5075534A1975-06-20
JP2012025998A2012-02-09
Other References:
See also references of EP 3705598A4
Attorney, Agent or Firm:
AICHI, TAKAHASHI, IWAKURA & ASSOCIATES (JP)
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