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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.:

US 10689721 B1

PDFFull Text
Date of Patent:
Jun. 23, 2020

Filed:

Jan. 23, 2015

Case hardening steel and carburized component obtained therefrom

Applicant:

Daido Steel Co., Ltd., Nagoya-shi, Aichi, JP;

Inventors:

Kyohei Nakayama, Aichi, JP;

Toshiyuki Morita, Aichi, JP;

Keisuke Inoue, Aichi, JP;

Assignee:

DAIDO STEEL CO., LTD., Aichi, JP;

Attorney:

Greenblum & Bernstein, P.L.C.

Primary Examiner:

Scott R Kastler

Assistant Examiner:

Jophy S Koshy

Int. Cl.
CPC ...
C21D 1/06 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C22C 38/42 (2006.01); C22C 38/44 (2006.01); C22C 38/50 (2006.01); C23C 8/22 (2006.01); C22C 38/60 (2006.01); C23C 8/80 (2006.01); C22C 38/48 (2006.01); C22C 38/54 (2006.01);
U.S. Cl.
CPC ...
C21D 1/06 (2013.01); C22C 38/00 (2013.01); C22C 38/001 (2013.01); C22C 38/002 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); C22C 38/42 (2013.01); C22C 38/44 (2013.01); C22C 38/48 (2013.01); C22C 38/50 (2013.01); C22C 38/54 (2013.01); C22C 38/60 (2013.01); C23C 8/22 (2013.01); C23C 8/80 (2013.01);
Abstract

The present invention provides a case hardening steel which satisfies the following expression (1) representing a relationship between a maximum deformation resistance σ(MPa) and a DI value, the maximum deformation resistance σ(MPa) being obtained when a test piece which has a size of ϕ 15×22.5 mm and is cut out from a material after spheroidizing, is subjected to compressive deformation by cold forging at a compression ratio of 70% in a state that an end surface thereof is restrained, and the DI value being obtained from a Jominy quenching test: σ<12.8×DI+745 . . . Expression (1). Additionally, the present invention obtains a carburized part by subjecting the case hardening steel to carburizing and quenching.

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