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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 10704117 B1

PDFFull Text
Date of Patent:
Jul. 07, 2020

Filed:

Jul. 28, 2016

Cold-rolled steel sheet, coated steel sheet, method for manufacturing cold-rolled steel sheet, and method for manufacturing coated steel sheet

Applicant:

Jfe Steel Corporation, Tokyo, JP;

Inventors:

Kenji Kawamura, Tokyo, JP;

Noriaki Kohsaka, Tokyo, JP;

Yoshimasa Funakawa, Tokyo, JP;

Mai Aoyama, Tokyo, JP;

Yoshitsugu Suzuki, Tokyo, JP;

Assignee:

JFE Steel Corporation, Tokyo, JP;

Attorney:

RatnerPrestia

Primary Examiner:

Anthony J Zimmer

Assistant Examiner:

Ricardo D Morales

Int. Cl.
CPC ...
C21D 9/46 (2006.01); C22C 38/06 (2006.01); C22C 38/60 (2006.01); C21D 8/02 (2006.01); C23C 2/06 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/08 (2006.01); C22C 38/12 (2006.01); C22C 38/14 (2006.01); C22C 38/16 (2006.01); C22C 38/28 (2006.01); C22C 38/32 (2006.01); C21D 6/00 (2006.01); C23C 2/02 (2006.01); C22C 38/38 (2006.01); C23C 8/14 (2006.01); C23C 2/28 (2006.01); C23C 2/40 (2006.01); C23F 17/00 (2006.01);
U.S. Cl.
CPC ...
C21D 9/46 (2013.01); C21D 6/002 (2013.01); C21D 6/005 (2013.01); C21D 6/008 (2013.01); C21D 8/0205 (2013.01); C21D 8/0236 (2013.01); C21D 8/0247 (2013.01); C21D 8/0273 (2013.01); C21D 8/0278 (2013.01); C22C 38/001 (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 38/08 (2013.01); C22C 38/12 (2013.01); C22C 38/14 (2013.01); C22C 38/16 (2013.01); C22C 38/28 (2013.01); C22C 38/32 (2013.01); C22C 38/38 (2013.01); C22C 38/60 (2013.01); C23C 2/02 (2013.01); C23C 2/06 (2013.01); C23C 2/28 (2013.01); C23C 2/40 (2013.01); C23C 8/14 (2013.01); C23F 17/00 (2013.01); C21D 8/0226 (2013.01); C21D 2211/002 (2013.01); C21D 2211/005 (2013.01); C21D 2211/008 (2013.01);
Abstract

Provided are a cold-rolled steel sheet which can preferably be used for manufacturing a high-strength galvanized steel sheet and methods for manufacturing the steel sheets. The cold-rolled steel sheet has a specified chemical composition, in which the Mn concentration in a surface layer of the steel sheet satisfies relational expression (1) and relational expression (2) below. 8≤(C/C)×Mn . . . (1) (C/C)×Mn≤2.5 . . . (2) where C: maximum Mn concentration in a region within 0.5 μm of the surface of a steel sheet in the thickness direction; C: average Mn concentration in a region from a position located 5 μm from a surface of a steel sheet in the thickness direction to a position located 5 μm from an opposite surface in the thickness direction; C: minimum Mn concentration in a region from 0.5 μm to 5 μm from the surface of a steel sheet in the thickness direction; and Mn: Mn content (mass %).

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