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:
Jan. 07, 2020
Filed:
Jul. 05, 2016
Applicant:
Jfe Steel Corporation, Chiyoda-ku, Tokyo, JP;
Inventors:
Taro Kizu, Tokyo, JP;
Shunsuke Toyoda, Tokyo, JP;
Akimasa Kido, Tokyo, JP;
Tetsushi Tadani, Tokyo, JP;
Assignee:
JFE STEEL CORPORATION, Chiyoda-ku, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C21D 9/46 (2006.01); C21D 8/02 (2006.01); C21D 7/13 (2006.01); C21D 6/00 (2006.01); C21D 1/18 (2006.01); C22C 38/06 (2006.01); C22C 38/02 (2006.01); C22C 38/38 (2006.01); C22C 38/28 (2006.01); C22C 38/24 (2006.01); C22C 38/00 (2006.01); B21B 1/22 (2006.01);
U.S. Cl.
CPC ...
C21D 9/46 (2013.01); B21B 1/22 (2013.01); C21D 1/18 (2013.01); C21D 6/005 (2013.01); C21D 6/008 (2013.01); C21D 7/13 (2013.01); C21D 8/0205 (2013.01); C21D 8/0226 (2013.01); C21D 8/0263 (2013.01); C22C 38/001 (2013.01); C22C 38/002 (2013.01); C22C 38/02 (2013.01); C22C 38/06 (2013.01); C22C 38/24 (2013.01); C22C 38/28 (2013.01); C22C 38/38 (2013.01); B21B 2001/225 (2013.01); C21D 2211/004 (2013.01); C21D 2211/005 (2013.01);
Abstract
This disclosure provides a predetermined composition, where a conversion value C* of total carbon contents in Ti, Nb and V precipitates whose grain sizes are less than 20 nm is 0.010 mass % to 0.100 mass %, Fe content in Fe precipitates is 0.03 mass % to 0.50 mass %, and an average grain size of ferrite grains whose grain sizes are top 5 % large in ferrite grain size distribution of rolling direction cross section is (4000/TS)μm or less, the TS indicating tensile strength in unit of MPa.