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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 10982297 B1

PDFFull Text
Date of Patent:
Apr. 20, 2021

Filed:

Sep. 28, 2017

Steel sheet and method for producing the same

Applicant:

Jfe Steel Corporation, Tokyo, JP;

Inventors:

Yoshihiko Ono, Tokyo, JP;

Shimpei Yoshioka, Tokyo, JP;

Nobuyuki Nakamura, Tokyo, JP;

Hiroshi Hasegawa, Tokyo, JP;

Assignee:

JFE STEEL CORPORATION, Tokyo, JP;

Attorney:

Oliff PLC

Primary Examiner:

Michael E La Villa

Int. Cl.
CPC ...
C23C 2/06 (2006.01); C23C 2/40 (2006.01); C22C 38/58 (2006.01); C22C 38/54 (2006.01); C22C 38/50 (2006.01); C22C 38/48 (2006.01); C22C 38/42 (2006.01); C22C 38/46 (2006.01); C22C 38/06 (2006.01); C22C 38/02 (2006.01); C22C 38/00 (2006.01); C22C 38/44 (2006.01); B32B 15/01 (2006.01); C21D 8/02 (2006.01); C21D 9/46 (2006.01); C21D 6/00 (2006.01); C22C 38/08 (2006.01); C22C 38/16 (2006.01); C21D 8/04 (2006.01); C22C 38/60 (2006.01); C22C 38/14 (2006.01); C22C 38/12 (2006.01); C22C 38/04 (2006.01); C21D 9/52 (2006.01); C22C 38/40 (2006.01); C22C 38/18 (2006.01); B32B 15/04 (2006.01); C22C 38/28 (2006.01); C22C 38/32 (2006.01); C22C 38/22 (2006.01); C23C 30/00 (2006.01); C23C 28/00 (2006.01); B32B 15/18 (2006.01); C22C 38/20 (2006.01); C22C 38/24 (2006.01); C22C 38/26 (2006.01); C23C 28/02 (2006.01);
U.S. Cl.
CPC ...
C21D 9/46 (2013.01); B32B 15/01 (2013.01); B32B 15/013 (2013.01); B32B 15/04 (2013.01); B32B 15/043 (2013.01); B32B 15/18 (2013.01); C21D 6/004 (2013.01); C21D 6/005 (2013.01); C21D 6/008 (2013.01); C21D 8/021 (2013.01); C21D 8/0205 (2013.01); C21D 8/0236 (2013.01); C21D 8/0247 (2013.01); C21D 8/041 (2013.01); C21D 8/0405 (2013.01); C21D 8/0426 (2013.01); C21D 8/0436 (2013.01); C21D 8/0473 (2013.01); C21D 9/52 (2013.01); C22C 38/001 (2013.01); C22C 38/002 (2013.01); C22C 38/005 (2013.01); C22C 38/008 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); C22C 38/08 (2013.01); C22C 38/12 (2013.01); C22C 38/14 (2013.01); C22C 38/16 (2013.01); C22C 38/18 (2013.01); C22C 38/20 (2013.01); C22C 38/22 (2013.01); C22C 38/24 (2013.01); C22C 38/26 (2013.01); C22C 38/28 (2013.01); C22C 38/32 (2013.01); C22C 38/40 (2013.01); C22C 38/42 (2013.01); C22C 38/44 (2013.01); C22C 38/46 (2013.01); C22C 38/48 (2013.01); C22C 38/50 (2013.01); C22C 38/54 (2013.01); C22C 38/58 (2013.01); C22C 38/60 (2013.01); C23C 2/06 (2013.01); C23C 2/40 (2013.01); C23C 28/025 (2013.01); C23C 28/3225 (2013.01); C23C 30/00 (2013.01); C23C 30/005 (2013.01); C21D 2211/002 (2013.01); C21D 2211/008 (2013.01); Y10T 428/12757 (2015.01); Y10T 428/12799 (2015.01); Y10T 428/12951 (2015.01); Y10T 428/12972 (2015.01);
Abstract

A steel sheet having a specified chemical composition and a method for producing the steel sheet. The steel sheet has a microstructure including martensite and bainite. The total area fraction of the martensite and the bainite to the entirety of the microstructure is more than 90% and 100% or less. The microstructure includes inclusion clusters A and B, the content of the clusters A in the microstructure being 2 clusters/mmor less, and the content of the clusters B in the microstructure being 5 clusters/mmor less. The microstructure includes carbide particles including Fe as a main constituent which have an aspect ratio of 2.0 or less and a major axis of 0.30 μm or more and 2 μm or less. The content of the carbide particles in the microstructure is 4000 particles/mmor less. The microstructure includes prior γ grains having an average size of 6 to 15 μm.

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