Title:
BAKE-HARDENED HOT-DIP GALVANIZED STEEL SHEET WITH EXCELLENT POWDERING RESISTANCE, AND MANUFACTURING METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2022/103058
Kind Code:
A1
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 of the present invention 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.
Inventors:
KIM SANG-HYUN (KR)
HAN SEONG-HO (KR)
KIM CHUNG-WON (KR)
HA YU-MI (KR)
HAN SEONG-HO (KR)
KIM CHUNG-WON (KR)
HA YU-MI (KR)
Application Number:
PCT/KR2021/015783
Publication Date:
May 19, 2022
Filing Date:
November 03, 2021
Export Citation:
Assignee:
POSCO (KR)
International Classes:
C22C38/32; C21D8/02; C21D9/46; C22C38/22; C22C38/26; C22C38/28; C23C2/06
Foreign References:
| KR20130081707A | 2013-07-17 | |||
| JP2003268490A | 2003-09-25 | |||
| KR20140048668A | 2014-04-24 | |||
| JP2008308732A | 2008-12-25 | |||
| JPH10195540A | 1998-07-28 | |||
| KR20140048668A | 2014-04-24 | |||
| KR20110005414A | 2011-01-18 |
Attorney, Agent or Firm:
C&S PATENT AND LAW OFFICE (KR)
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