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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 12781302 B1

PDFFull Text
Date of Patent:
Nov. 03, 2026

Filed:

Dec. 09, 2021

High strength hot-dip galvanized steel sheet having excellent plating adhesion and weldability and method of manufacturing same

Applicant:

Posco Co., Ltd, Pohang-si, KR;

Inventors:

Young-Ha Kim, Gwangyang-si, KR;

Myung-Soo Kim, Gwangyang-si, KR;

Kwang-Tai Min, Gwangyang-si, KR;

Ki-Cheol Kang, Gwangyang-si, KR;

Assignee:

POSCO CO., LTD, Pohang-si, KR;

Attorney:

Morgan Lewis & Bockius LLP

Primary Examiner:

Anthony M Liang

Int. Cl.
CPC ...
C21D 9/46 (2006.01); C21D 8/02 (2026.01); C21D 8/0221 (2026.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C23C 2/00 (2006.01); C23C 2/06 (2006.01); C23C 2/40 (2006.01); C23G 1/00 (2006.01);
U.S. Cl.
CPC ...
C21D 9/46 (2013.01); C21D 8/0226 (2013.01); C21D 8/0236 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); C23C 2/06 (2013.01); C23C 2/40 (2013.01); C23C 2/522 (2022.08); C23G 1/00 (2013.01);
Abstract

An embodiment of the present invention provides a high strength hot-dip galvanized steel sheet having excellent plating adhesion and weldability and a method of manufacturing same, wherein: the steel sheet comprises a base steel sheet and a hot-dip galvanized layer formed on one surface or both surfaces of the base steel sheet, the base steel sheet comprising, in weight %, carbon (C): 0.1-0.3%, silicon (Si): 0.1-2.0%, aluminum (Al): 0.1-1.5%, manganese (Mn): 1.5-3.0%, and the balance being Fe and inevitable impurities, the sum of Si and Al satisfying 1.2-3.5%, the ratio (Al/Si) of Al and Si satisfying 0.5-2.0; the steel sheet comprises an internal oxidation layer with a thickness of 1-5 μm directly below the surface of the base steel sheet; and the decarburization rate in a region from directly below the surface of the base steel sheet to 50 μm is 50% or more.

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Kim, Young-Ha. (2026). High strength hot-dip galvanized steel sheet having excellent plating adhesion and weldability and method of manufacturing same (U.S. Patent No. 12781302). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/12781302

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