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. 14, 2019
Filed:
Jun. 23, 2014
Applicants:
Kyohei Nakayama, Aichi, JP;
Yasuaki Sakai, Aichi, JP;
Toshiyuki Morita, Aichi, JP;
Keisuke Inoue, Aichi, JP;
Inventors:
Kyohei Nakayama, Aichi, JP;
Yasuaki Sakai, Aichi, JP;
Toshiyuki Morita, Aichi, JP;
Keisuke Inoue, Aichi, JP;
Assignee:
DAIDO STEEL CO., LTD., Aichi, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C23C 8/80 (2006.01); C22C 38/44 (2006.01); C22C 38/60 (2006.01); C22C 38/42 (2006.01); C22C 38/04 (2006.01); C22C 38/02 (2006.01); C22C 38/00 (2006.01); C22C 38/54 (2006.01); C22C 38/50 (2006.01); C22C 38/48 (2006.01); C22C 38/12 (2006.01); C21D 1/06 (2006.01); C23C 8/22 (2006.01);
U.S. Cl.
CPC ...
C23C 8/80 (2013.01); C21D 1/06 (2013.01); C22C 38/001 (2013.01); C22C 38/002 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/12 (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); C21D 2211/004 (2013.01);
Abstract
Provided is a case hardening steel which allows effective inhibition of abnormal grain growth during carburizing treatment or the like and makes it possible to solve the problem of abnormal grain growth-induced reduction in characteristics. In the case hardening steel, a total amount of TiC, ZrC and AlN which are precipitate particles contained in 100 g of a steel material after subjecting the case hardening steel to hot rolling is 3.5×10mole or less.