Title:
METHOD FOR PRODUCING SURFACE-HARDENED MATERIAL
Document Type and Number:
WIPO Patent Application WO/2020/045266
Kind Code:
A1
Abstract:
A method for producing a surface-hardened material, comprising: an immersion step of immersing an iron steel material having nitrogen attached in the form of a solid solution on the surface thereof in a melt containing a chloride at a temperature ranging from 650 to 900°C; and a cooling step of cooling the immersed iron steel material to a temperature equal to or lower than a martensitic transformation start temperature at a cooling rate equal to or higher than a lower critical cooling rare at which martensitic transformation starts.
Inventors:
NAKAJIMA RYU (JP)
ITO TARO (JP)
MATSUKAWA TATSUYA (JP)
BEPPU MASAAKI (JP)
ITO TARO (JP)
MATSUKAWA TATSUYA (JP)
BEPPU MASAAKI (JP)
Application Number:
PCT/JP2019/032980
Publication Date:
March 05, 2020
Filing Date:
August 23, 2019
Export Citation:
Assignee:
NIHON PARKERIZING (JP)
International Classes:
C23C8/80; C21D1/06; C23C8/26; C23C8/50; C22C38/00; C22C38/60
Foreign References:
JPS459045B1 | 1970-04-01 | |||
JPS6240362A | 1987-02-21 | |||
JPS6270561A | 1987-04-01 | |||
JP2015059248A | 2015-03-30 | |||
JPH07138733A | 1995-05-30 |
Other References:
See also references of EP 3825438A4
Attorney, Agent or Firm:
ASAMURA PATENT OFFICE, P.C. (JP)
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