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:
Jun. 09, 2015
Filed:
Jun. 28, 2012
Applicants:
Takashi Morohoshi, Tokyo, JP;
Takashi Aramaki, Tokyo, JP;
Masafumi Zeze, Tokyo, JP;
Inventors:
Assignee:
NIPPON STEEL & SUMITOMO METAL CORPORATION, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C22C 38/20 (2006.01); C22C 38/22 (2006.01); C22C 38/24 (2006.01); C22C 38/26 (2006.01); C22C 38/28 (2006.01); C21D 9/46 (2006.01); C22C 38/54 (2006.01); C22C 38/32 (2006.01); C22C 38/50 (2006.01); C21C 7/04 (2006.01); C21D 8/02 (2006.01);
U.S. Cl.
CPC ...
C22C 38/001 (2013.01); C21D 9/46 (2013.01); C21C 7/04 (2013.01); C22C 38/00 (2013.01); C22C 38/28 (2013.01); C22C 38/54 (2013.01); C22C 38/002 (2013.01); C22C 38/005 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); C22C 38/20 (2013.01); C22C 38/22 (2013.01); C22C 38/24 (2013.01); C22C 38/26 (2013.01); C22C 38/32 (2013.01); C22C 38/50 (2013.01); C21D 8/0226 (2013.01); C21D 8/0236 (2013.01); C21D 8/0263 (2013.01); C21D 8/0273 (2013.01); C21D 2211/004 (2013.01);
Abstract
Disclosed is a steel sheet in which the amounts of respective elements in chemical components, which are represented by mass %, satisfy the following Expression 1 and Expression 2. In addition, the steel contains Ti-included-carbonitrides as inclusions, and the number density of the Ti-included-carbonitrides having a long side of 5 μm or more is 3 pieces/mmor less.0.3≦{Ca/40.88+(REM/140)/2}/(S/32.07)  (Expression 1)Ca≦0.005−0.0035×C  (Expression 2).