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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 11001918 B1

PDFFull Text
Date of Patent:
May. 11, 2021

Filed:

Dec. 22, 2017

High-strength hot-dip galvanized steel sheet having excellent plating surface quality and adhesion, and method of manufacturing the same

Applicant:

Posco, Pohang-si, KR;

Inventors:

Myung-Soo Kim, Gwangyang-si, KR;

Jong-Sang Kim, Gwangyang-si, KR;

Young-Ha Kim, Gwangyang-si, KR;

Joong-Chul Park, Gwangyang-si, KR;

Assignee:

POSCO, Pohang-si, KR;

Attorney:

Cantor Colburn LLP

Primary Examiner:

Hai Y Zhang

Int. Cl.
CPC ...
C23C 2/00 (2006.01); C23C 2/02 (2006.01); C23C 2/06 (2006.01); C25D 5/48 (2006.01); C25D 7/06 (2006.01); C23C 28/00 (2006.01); C21D 9/46 (2006.01); C23C 2/28 (2006.01); B32B 15/01 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C23C 2/40 (2006.01); C25D 3/20 (2006.01);
U.S. Cl.
CPC ...
C23C 2/02 (2013.01); B32B 15/011 (2013.01); B32B 15/013 (2013.01); C21D 9/46 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); C23C 2/06 (2013.01); C23C 2/28 (2013.01); C23C 2/40 (2013.01); C23C 28/322 (2013.01); C23C 28/3225 (2013.01); C23C 28/345 (2013.01); C23C 28/36 (2013.01); C25D 5/48 (2013.01); C25D 7/0614 (2013.01); C25D 3/20 (2013.01); Y10T 428/12799 (2015.01);
Abstract

Provided is a method of manufacturing a hot-dip galvanized steel sheet. According to an aspect of the present invention, the method may include preparing a base steel sheet, forming a iron (Fe)-plated layer on the prepared base steel sheet, oxidation heating the steel sheet having the Fe-plated layer formed thereon at a temperature ranging from 600° C. to 800° C., maintaining the heated steel sheet at a temperature ranging from 750° C. to 900° C. for 5 seconds or more in a reducing atmosphere with a dew point of between −30° C. to 5° C. including 20 ppm or less of oxygen, 1 vol % to 20 vol % of H, and Nas well as unavoidable gases as a remainder, cooling the maintained steel sheet, and plating the cooled steel sheet by dipping in a hot-dip galvanizing bath.

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