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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 9702035 B1

PDFFull Text
Date of Patent:
Jul. 11, 2017

Filed:

Dec. 03, 2014

High-strength hot-dip galvanized steel sheet excellent in impact resistance property and manufacturing method thereof, and high-strength alloyed hot-dip galvanized steel sheet and manufacturing method thereof

Applicant:

Nippon Steel & Sumitomo Metal Corporation, Tokyo, JP;

Inventors:

Hiroyuki Kawata, Tokyo, JP;

Naoki Maruyama, Tokyo, JP;

Akinobu Murasato, Tokyo, JP;

Akinobu Minami, Tokyo, JP;

Takeshi Yasui, Tokyo, JP;

Takuya Kuwayama, Tokyo, JP;

Hiroyuki Ban, Tokyo, JP;

Kaoru Hiramatsu, Tokyo, JP;

Assignee:

NIPPON STEEL & SUMITOMO METAL CORPORATION, Tokyo, JP;

Attorney:

Birch, Stewart, Kolasch & Birch, LLP

Primary Examiner:

Roy King

Assistant Examiner:

Jophy S Koshy

Int. Cl.
CPC ...
C22C 38/04 (2006.01); C23C 2/02 (2006.01); B21B 1/26 (2006.01); B21B 3/00 (2006.01); C23C 2/06 (2006.01); C23C 2/28 (2006.01); C21D 9/46 (2006.01); C22C 18/04 (2006.01); C22C 38/00 (2006.01); C22C 38/06 (2006.01); C22C 38/58 (2006.01); B32B 15/01 (2006.01); C21D 8/02 (2006.01); C22C 38/02 (2006.01); C21D 1/26 (2006.01); C21D 1/72 (2006.01); C23C 2/12 (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 ...
C23C 2/02 (2013.01); B21B 1/26 (2013.01); B21B 3/00 (2013.01); B32B 15/013 (2013.01); C21D 1/26 (2013.01); C21D 1/72 (2013.01); C21D 8/0257 (2013.01); C21D 8/0263 (2013.01); C21D 8/0284 (2013.01); C21D 9/46 (2013.01); C22C 18/04 (2013.01); C22C 38/00 (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 38/58 (2013.01); C23C 2/06 (2013.01); C23C 2/12 (2013.01); C23C 2/28 (2013.01); C21D 8/0278 (2013.01); C21D 2211/002 (2013.01); C21D 2211/008 (2013.01); C21D 2251/02 (2013.01); Y10T 428/12618 (2015.01); Y10T 428/12799 (2015.01); Y10T 428/12972 (2015.01); Y10T 428/265 (2015.01);
Abstract

A base steel sheet has a hot-dip galvanized layer formed on a surface thereof, in which, in a steel sheet structure in a range of ⅛ thickness to ⅜ thickness centered around ¼ thickness of a sheet thickness from a surface, a volume fraction of a retained austenite phase is 5% or less, and a total volume fraction of phases of bainite, bainitic ferrite, fresh martensite, and tempered martensite is 40% or more, an average effective crystal grain diameter is 5.0 μm or less, a maximum effective crystal grain diameter is 20 μm or less, and a decarburized layer with a thickness of 0.01 μm to 10.0 μm is formed on a surface layer portion, in which a density of oxides dispersed in the decarburized layer is 1.0×10to 1.0×10oxides/m, and an average grain diameter of the oxides is 500 nm or less.

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