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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 10604829 B1

PDFFull Text
Date of Patent:
Mar. 31, 2020

Filed:

Jan. 05, 2016

High-strength plated steel sheet having excellent plating properties, workability, and delayed fracture resistance, and method for producing same

Applicant:

Kobe Steel, Ltd., Kobe-shi, JP;

Inventors:

Muneaki Ikeda, Kakogawa, JP;

Michiharu Nakaya, Kakogawa, JP;

Assignee:

Kobe Steel, Ltd., Kobe-shi, JP;

Attorney:

Oblon, McClelland, Maier & Neustadt, L.L.P.

Primary Examiner:

Michael E La Villa

Int. Cl.
CPC ...
C23C 2/40 (2006.01); C23C 2/06 (2006.01); C23C 2/28 (2006.01); C21D 8/02 (2006.01); C21D 9/46 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C22C 38/60 (2006.01); C23C 30/00 (2006.01); B32B 15/18 (2006.01); C23C 2/00 (2006.01); B32B 15/04 (2006.01); C23C 2/26 (2006.01); C23C 2/36 (2006.01); B32B 15/01 (2006.01); C22C 38/14 (2006.01); C22C 38/38 (2006.01); C22C 38/12 (2006.01); C22C 38/16 (2006.01); C22C 38/08 (2006.01); C22C 38/18 (2006.01); C22C 38/20 (2006.01); C22C 38/28 (2006.01); C21D 6/00 (2006.01); C23G 1/08 (2006.01);
U.S. Cl.
CPC ...
C23C 2/40 (2013.01); B32B 15/013 (2013.01); B32B 15/04 (2013.01); B32B 15/043 (2013.01); B32B 15/18 (2013.01); C21D 6/001 (2013.01); C21D 6/002 (2013.01); C21D 6/005 (2013.01); C21D 6/008 (2013.01); C21D 8/0205 (2013.01); C21D 8/0247 (2013.01); C21D 8/0263 (2013.01); C21D 8/0278 (2013.01); C21D 9/46 (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 38/28 (2013.01); C22C 38/38 (2013.01); C22C 38/60 (2013.01); C23C 2/00 (2013.01); C23C 2/06 (2013.01); C23C 2/26 (2013.01); C23C 2/28 (2013.01); C23C 2/36 (2013.01); C23C 30/00 (2013.01); C23C 30/005 (2013.01); C23G 1/08 (2013.01); C21D 2211/001 (2013.01); C21D 2211/005 (2013.01); Y10T 428/1259 (2015.01); Y10T 428/1266 (2015.01); Y10T 428/12583 (2015.01); Y10T 428/12611 (2015.01); Y10T 428/12618 (2015.01); Y10T 428/12667 (2015.01); Y10T 428/12951 (2015.01); Y10T 428/12958 (2015.01); Y10T 428/12965 (2015.01); Y10T 428/12972 (2015.01); Y10T 428/12993 (2015.01); Y10T 428/2495 (2015.01); Y10T 428/24942 (2015.01); Y10T 428/24967 (2015.01); Y10T 428/24975 (2015.01); Y10T 428/263 (2015.01); Y10T 428/264 (2015.01); Y10T 428/265 (2015.01);
Abstract

Disclosed herein is a high-strength plated steel sheet having a plated layer on the surface of a base steel sheet and containing predetermined steel components. The steel sheet includes, in the order from the interface of the base steel sheet and the plated layer towards the base steel sheet: a soft layer having a Vickers hardness that is 90% or less of the Vickers hardness at a portion t/4 of the base steel sheet, where t is a sheet thickness of the base steel sheet; and a hard layer consisting of a structure which is mainly composed of martensite and bainite and in which the average grain size of prior austenite is 20 μm or less. The average depth D of the soft layer is 20 μm or greater, and the average depth d of an internal oxide layer is 4 μm or greater and smaller than D.

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