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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 12180559 B1

PDFFull Text
Date of Patent:
Dec. 31, 2024

Filed:

Nov. 03, 2021

Bake-hardened hot-dip galvanized steel sheet with excellent powdering resistance, and manufacturing method therefor

Applicant:

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

Inventors:

Sang-Hyun Kim, Gwangyang-si, KR;

Seong-Ho Han, Gwangyang-si, KR;

Chung-Won Kim, Gwangyang-si, KR;

Yu-Mi Ha, Gwangyang-si, KR;

Assignee:

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

Attorney:

CANTOR COLBURN LLP

Primary Examiner:

Daniel J Schleis

Int. Cl.
CPC ...
B32B 15/01 (2006.01); C21D 1/18 (2006.01); C21D 6/00 (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 38/22 (2006.01); C22C 38/26 (2006.01); C22C 38/32 (2006.01); C23C 2/02 (2006.01); C23C 2/26 (2006.01);
U.S. Cl.
CPC ...
C21D 9/46 (2013.01); C21D 1/18 (2013.01); C21D 6/002 (2013.01); C21D 6/005 (2013.01); C21D 6/008 (2013.01); C21D 8/0205 (2013.01); C21D 8/0226 (2013.01); C21D 8/0236 (2013.01); C21D 8/0263 (2013.01); C21D 8/0278 (2013.01); C22C 38/001 (2013.01); C22C 38/002 (2013.01); C22C 38/004 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); C22C 38/22 (2013.01); C22C 38/26 (2013.01); C22C 38/32 (2013.01); C23C 2/0224 (2022.08); C23C 2/26 (2013.01); C21D 2211/005 (2013.01);
Abstract

Provided are a bake-hardened hot-dip galvanized steel sheet with excellent powdering resistance, and a manufacturing method therefor. The bake-hardened hot-dip galvanized steel sheet comprises, by wt %, 0.0001-0.005% of carbon (C), 0.1-1.2% of manganese (Mn), 0.02% or less of silicon (Si) (excluding 0%), 0.01-0.04% of phosphorus (P), 0.01% or less of sulfur (S) (excluding 0%), 0.01% or less of nitrogen (N) (excluding 0%), 0.01-0.06% of aluminum (sol.Al), 0.003-0.015% of niobium (Nb), 0.0005-0.0035% of boron (B), 0.01-0.1% of chromium (Cr), 0.005-0.05% of molybdenum (Mo), 0.003% or less of titanium (Ti) (excluding 0%), and the balance of Fe and inevitable impurities, and satisfies relationships 1 and 2, wherein the microstructure thereof is ferrite single phase and satisfies relationship 3.

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