HIGH-STRENGTH HOT-DIP GALVANIZED STEEL SHEET WITH HIGH DUCTILITY AND EXCELLENT FORMABILITY, AND MANUFACTURING METHOD FOR SAME

Title:

HIGH-STRENGTH HOT-DIP GALVANIZED STEEL SHEET WITH HIGH DUCTILITY AND EXCELLENT FORMABILITY, AND MANUFACTURING METHOD FOR SAME

Document Type and Number:

WIPO Patent Application WO/2022/124609

Kind Code:

A1

Abstract:

Provided is a high-strength hot-dip galvanized steel sheet with high ductility and excellent formability. The hot-dip galvanized steel sheet of the present invention comprises, in weight%, carbon (C): 0.06-0.16%, silicon (Si): 0.8% or less (0% excluded), manganese (Mn): 2.1-2.7%, molybdenum (Mo): 0.4% or less (0% excluded), chromium (Cr): 1% or less (0% excluded), phosphor (P): 0.1% or less (0% excluded), sulfur (S): 0.02% or less, aluminum (sol. Al): 1% or less (0% excluded), titanium (Ti): 0.001-0.04%, niobium (Nb): 0.001-0.04%, nitrogen (N): 0.01% or less (0% excluded), boron (B): 0.01% or less, antimony (Sb): 0.05% or less, and the balance being Fe and other inevitable impurities, wherein: the C, Si, Al, Mn, Cr, Mo, and B components among the base steel components in a matrix structure at the 1/4t point of the thickness of a base steel sheet satisfy relational formula 1; and the microstructure of the base steel sheet is composed of, in area%, 70% or more of a sum of bainite and tempered martensite, 10% or less of pearlite, and the balance being fresh martensite and retained austenite, the fraction of the retained austenite being 5% or less in area%.

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Inventors:

CHOI KANG-HYUN (KR)
AHN YEON-SANG (KR)
RYU JOO-HYUN (KR)

Application Number:

PCT/KR2021/016592

Publication Date:

June 16, 2022

Filing Date:

November 15, 2021

Export Citation:

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Assignee:

POSCO (KR)

International Classes:

C22C38/38; C21D8/02; C22C38/00; C22C38/22; C22C38/26; C22C38/28; C22C38/32; C23C2/40

Foreign References:

KR20190133739A	2019-12-03
JP6777274B1	2020-10-28
KR20200075991A	2020-06-29
JP2012117148A	2012-06-21
KR101597473B1	2016-02-24
JP2002177278A	2002-06-25
JP2010090432A	2010-04-22
KR20160173006A

Attorney, Agent or Firm:

C&S PATENT AND LAW OFFICE (KR)

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