The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 17, 2022
Filed:
Aug. 23, 2019
Applicant:
Nihon Parkerizing Co., Ltd., Tokyo, JP;
Inventors:
Ryu Nakajima, Tokyo, JP;
Taro Ito, Tokyo, JP;
Tatsuya Matsukawa, Tokyo, JP;
Masaaki Beppu, Atsugi, JP;
Assignee:
NIHON PARKERIZING CO., LTD., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C23C 8/50 (2006.01); C21D 1/06 (2006.01); C23C 8/46 (2006.01);
U.S. Cl.
CPC ...
C23C 8/50 (2013.01); C21D 1/06 (2013.01); C23C 8/46 (2013.01);
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° C. 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.