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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 10507629 B1

PDFFull Text
Date of Patent:
Dec. 17, 2019

Filed:

Nov. 05, 2015

Hot-dip galvanized steel sheet

Applicant:

Nippon Steel Corporation, Tokyo, JP;

Inventors:

Hiroyuki Kawata, Kisarazu, JP;

Takeshi Yasui, Jawa Barat, ID;

Kohei Ueda, Chiba, JP;

Naoki Maruyama, Kimitsu, JP;

Yuji Yamaguchi, Kimitsu, JP;

Satoshi Uchida, Kisarazu, JP;

Ryosuke Komami, Kimitsu, JP;

Hayato Arai, San Pedro, MX;

Yasuhiro Nakashima, Chiba, JP;

Toyomitsu Nakamura, Kisarazu, JP;

Assignee:

NIPPON STEEL CORPORATION, Tokyo, JP;

Attorney:

Birch, Stewart, Kolasch & Birch, LLP

Primary Examiner:

Daniel J Schleis

Int. Cl.
CPC ...
B32B 15/01 (2006.01); C23C 2/06 (2006.01); C23C 2/40 (2006.01); C21D 9/46 (2006.01); C22C 38/06 (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 38/18 (2006.01);
U.S. Cl.
CPC ...
B32B 15/013 (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); C23C 2/06 (2013.01); C23C 2/40 (2013.01); B32B 2255/06 (2013.01); B32B 2255/205 (2013.01); C21D 2211/005 (2013.01); Y10T 428/12799 (2015.01);
Abstract

A hot-dip galvanized steel sheet wherein the hot-dip galvanized steel sheet comprises a base steel sheet and a hot-dip galvanized layer, a ferrite phase is, by volume fraction, 40% or more and 97% or less in a range of ⅛ thickness to ⅜ thickness centered at a position of ¼ thickness from the surface of the base steel sheet, a hard structure is 3% or more in total, wherein the hot-dip galvanized steel sheet has the hot-dip galvanized layer in which Fe is 5.0% or less and Al is 1.0% or less, and columnar grains formed of a ζ phase is 20% or more in an entire interface between the plated layer and the base steel sheet on the surface of the base steel sheet in which a ratio of a volume fraction of the hard structure in a surface layer range of 20 μm depth in a steel sheet direction from an interface between the hot-dip galvanized layer and the base steel sheet is 0.10 times or more to 0.90 times or less of a volume fraction of the hard structure in the range of ⅛ thickness to ⅜ thickness, and wherein the hot-dip galvanized steel sheet has a refined layer at the side of the interface in the base steel sheet, and wherein an average thickness of the refined layer, an average grain size of ferrite in the refined layer and a maximum size of the oxide included in the refined layer are defined respectively.

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