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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 10501832 B1

PDFFull Text
Date of Patent:
Dec. 10, 2019

Filed:

Apr. 22, 2016

Plated steel sheet

Applicant:

Nippon Steel & Sumitomo Metal Corporation, Tokyo, JP;

Inventors:

Koutarou Hayashi, Tokyo, JP;

Akihiro Uenishi, Tokyo, JP;

Masaharu Kameda, Tokyo, JP;

Jun Haga, Tokyo, JP;

Kunio Hayashi, Tokyo, JP;

Kohichi Sano, Tokyo, JP;

Hiroyuki Kawata, Tokyo, JP;

Assignee:

NIPPON STEEL CORPORATION, Tokyo, JP;

Attorney:

Birch, Stewart, Kolasch & Birch, LLP

Primary Examiner:

Seth Dumbris

Assistant Examiner:

Kim S Horger

Int. Cl.
CPC ...
B32B 15/00 (2006.01); C22C 38/58 (2006.01); C21D 9/46 (2006.01); C21D 8/02 (2006.01); C22C 38/00 (2006.01); C22C 38/06 (2006.01); C22C 38/34 (2006.01); C22C 38/42 (2006.01); C22C 38/44 (2006.01); C22C 38/46 (2006.01); C22C 38/48 (2006.01); C22C 38/50 (2006.01); C22C 38/54 (2006.01); C23C 2/40 (2006.01); C23C 2/02 (2006.01); C23C 2/06 (2006.01); C23C 2/28 (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 38/18 (2006.01); C22C 38/22 (2006.01); C22C 38/38 (2006.01);
U.S. Cl.
CPC ...
C22C 38/58 (2013.01); C21D 8/0257 (2013.01); C21D 9/46 (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 38/18 (2013.01); C22C 38/22 (2013.01); C22C 38/34 (2013.01); C22C 38/38 (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); C23C 2/02 (2013.01); C23C 2/06 (2013.01); C23C 2/28 (2013.01); C23C 2/40 (2013.01); C21D 2211/001 (2013.01); C21D 2211/005 (2013.01); C21D 2211/008 (2013.01);
Abstract

A base material () included in a plated steel sheet () includes a structure, at a ¼ sheet thickness position, represented by, in volume fraction: tempered martensite: 3.0% or more; ferrite: 4.0% or more; and retained austenite: 5.0% or more. An average hardness of the tempered martensite in the base material () is 5 GPa to 10 GPa, and a part or all of the tempered martensite and the retained austenite in the base material form an M-A. A volume fraction of ferrite in a decarburized ferrite layer () included in the plated steel sheet () is 120% or more of the volume fraction of the ferrite in the base material () at the ¼ sheet thickness position, an average grain diameter of the ferrite in the decarburized ferrite layer () is 20 μm or less, a thickness of the decarburized ferrite layer () is 5 μm to 200 μm, a volume fraction of tempered martensite in the decarburized ferrite layer () is 1.0 volume% or more, a number density of the tempered martensite in the decarburized ferrite layer () is 0.01/μmor more, and an average hardness of the tempered martensite in the decarburized ferrite layer () is 8 GPa or less.

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