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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 11225701 B1

PDFFull Text
Date of Patent:
Jan. 18, 2022

Filed:

Mar. 30, 2018

Hot dip galvanized steel sheet and hot dip galvannealed steel sheet

Applicant:

Nippon Steel Corporation, Tokyo, JP;

Inventors:

Jun Haga, Tokyo, JP;

Kohichi Sano, Tokyo, JP;

Koutarou Hayashi, Tokyo, JP;

Kunio Hayashi, Tokyo, JP;

Masaharu Kameda, Tokyo, JP;

Akihiro Uenishi, Tokyo, JP;

Hiroyuki Kawata, Tokyo, JP;

Assignee:

NIPPON STEEL CORPORATION, Tokyo, JP;

Attorney:

Birch, Stewart, Kolasch & Birch, LLP

Primary Examiner:

Michael E La Villa

Int. Cl.
CPC ...
C21D 6/00 (2006.01); C21D 9/46 (2006.01); B32B 15/01 (2006.01); C22C 38/38 (2006.01); C22C 38/32 (2006.01); C22C 38/22 (2006.01); C22C 38/16 (2006.01); C22C 38/14 (2006.01); C22C 38/08 (2006.01); C22C 38/06 (2006.01); C22C 38/02 (2006.01); C22C 38/00 (2006.01); C23C 2/02 (2006.01); C23C 2/06 (2006.01); C23C 2/28 (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 38/46 (2006.01); C22C 38/44 (2006.01); C22C 38/42 (2006.01); C21D 8/02 (2006.01); C22C 38/26 (2006.01); B32B 15/04 (2006.01); C23C 30/00 (2006.01); C22C 38/34 (2006.01); C22C 38/24 (2006.01); C23C 28/00 (2006.01); C22C 38/12 (2006.01); C23C 28/02 (2006.01); C22C 38/20 (2006.01); C22C 38/18 (2006.01); C22C 38/40 (2006.01); C22C 38/28 (2006.01); C22C 38/04 (2006.01); C21D 8/00 (2006.01); B32B 15/18 (2006.01);
U.S. Cl.
CPC ...
C21D 9/46 (2013.01); B32B 15/013 (2013.01); B32B 15/04 (2013.01); B32B 15/043 (2013.01); B32B 15/18 (2013.01); C21D 6/002 (2013.01); C21D 6/005 (2013.01); C21D 6/008 (2013.01); C21D 8/005 (2013.01); C21D 8/0205 (2013.01); C21D 8/0221 (2013.01); C21D 8/0226 (2013.01); C21D 8/0231 (2013.01); C21D 8/0236 (2013.01); C21D 8/0247 (2013.01); C21D 8/0268 (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 38/20 (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 38/34 (2013.01); C22C 38/38 (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); C23C 2/02 (2013.01); C23C 2/06 (2013.01); C23C 2/28 (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 2211/001 (2013.01); C21D 2211/008 (2013.01); Y10T 428/12799 (2015.01); Y10T 428/12951 (2015.01); Y10T 428/12958 (2015.01); Y10T 428/12965 (2015.01); Y10T 428/12972 (2015.01); Y10T 428/12979 (2015.01);
Abstract

A hot dip galvanized steel sheet and hot dip galvannealed steel sheet improved in uniform ductility and local ductility, yield strength and tensile strength, and low temperature impact property, characterized by having a predetermined chemical composition, having a metal structure containing, by volume %, retained austenite: over 5.0% and tempered martensite: over 5.0%, having retained austenite containing C: 0.85 mass % or more, and having a ratio [C]/[P]of an amount of segregation of C (number of atoms/nm): [C]to an amount of segregation of P (number of atoms/nm): [P]at prior austenite grain boundaries of 4.0 or more.

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