EP 4163411 A4 20231220 - HOT-DIPPED ZINC-ALUMINUM-MAGNESIUM COATED STEEL SHEET AND MANUFACTURING METHOD THEREFOR
Title (en)
HOT-DIPPED ZINC-ALUMINUM-MAGNESIUM COATED STEEL SHEET AND MANUFACTURING METHOD THEREFOR
Title (de)
FEUERVERZINKTES ZINK-ALUMINIUM-MAGNESIUM-BESCHICHTETES STAHLBLECH UND HERSTELLUNGSVERFAHREN DAFÜR
Title (fr)
TÔLE D'ACIER REVÊTUE DE ZINC-ALUMINIUM-MAGNÉSIUM TREMPÉE À CHAUD ET SON PROCÉDÉ DE FABRICATION
Publication
Application
Priority
- CN 202010513855 A 20200608
- CN 2020121167 W 20201015
Abstract (en)
[origin: EP4163411A1] Disclosed by content of the present disclosure is a hot-dipped zinc-aluminum-magnesium coated steel sheet having cut corrosion resistance, comprising a steel sheet and a coating; the mass precents of chemical components of the coating are: aluminum, 2%-12%, magnesium, 1%-4%, and the remainder being zinc and unavoidable impurities; also, the mass percent of the aluminum is 2-3 times the mass percent of the magnesium; and the thickness of the coating is not less than 5% the thickness of the steel sheet. Further disclosed by content of the present disclosure is a preparation method for the coated steel sheet: utilizing the chemical components of the coating and obtaining a coating liquid; preheating the coating liquid and obtaining a preheated coating liquid, the temperature of the preheated coating liquid not being lower than the melting point of the coating liquid and not being higher than 500°C; obtaining a steel sheet, dipping the steel sheet into the preheated coating liquid, and obtaining a steel sheet having a coating; and lastly cooling the steel sheet having the coating. The provided preparation method allows for a cut location on a steel sheet to be amply covered by a solution, and a dense hydroxide double layered compound is formed, causing the hot dipped zinc-aluminum-magnesium coated steel sheet to have uniquely superior cut corrosion resistance.
IPC 8 full level
C23C 2/06 (2006.01); C22C 18/00 (2006.01); C23C 2/26 (2006.01); C23C 30/00 (2006.01)
CPC (source: CN EP KR)
C22C 18/04 (2013.01 - EP); C23C 2/06 (2013.01 - CN EP KR); C23C 2/26 (2013.01 - CN); C23C 2/29 (2022.08 - KR); C23C 2/40 (2013.01 - KR); C23C 30/00 (2013.01 - EP)
Citation (search report)
- [XA] EP 3239346 A1 20171101 - POSCO [KR]
- [XAI] CN 1398304 A 20030219 - NISSHIN STEEL CO LTD [JP]
- [X] CN 105671469 A 20160615 - SHOUGANG CORP
- [XAI] CN 110983224 A 20200410 - SHOUGANG GROUP CO LTD
- See also references of WO 2021248765A1
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
DOCDB simple family (publication)
EP 4163411 A1 20230412; EP 4163411 A4 20231220; CN 111534777 A 20200814; CN 111534777 B 20211119; JP 2023528640 A 20230705; JP 7498801 B2 20240612; KR 20230021116 A 20230213; WO 2021248765 A1 20211216
DOCDB simple family (application)
EP 20940134 A 20201015; CN 202010513855 A 20200608; CN 2020121167 W 20201015; JP 2022575298 A 20201015; KR 20237000593 A 20201015