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US 11,897,229 B2Granted
Aluminum alloy-plated steel sheet having excellent workability and corrosion resistance and method for manufacturing same
AssigneePosco
InventorsSuk-Kyu Lee, Hyeon-Seok Hwang, Myung-Soo Kim
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Abstract
The present disclosure relates to an aluminum alloy-plated steel sheet having excellent workability and corrosion resistance and a method for manufacturing the same, and more particularly, to an aluminum alloy-plated steel sheet preventing microcracks generated during hot forming and has excellent seizure resistance and corrosion resistance, and a method for manufacturing the same.
Claims12
An aluminum alloy-plated steel sheet comprising:
- a base steel sheet;
- an alloy-plated layer formed on the base steel sheet;
- and
- an unalloy-plated layer formed on the alloy-plated layer,
- wherein the alloy-plated layer contains, by wt %, 35 to 50% of Fe, 1 to 20% of Zn, 0.1 to 1.5% of Si, and a balance of Al and unavoidable impurities,
- the unalloy-plated layer contains, by wt %, 1 to 30% of Zn, 0.1 to 1.8% of Si, and a balance of Al and unavoidable impurities, and
- an interface roughness Ra, between the alloy-plated layer and the base steel sheet is 2.5 μm or less.
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A method for manufacturing an aluminum alloy-plated steel sheet used for hot press forming, the method comprising:
- preparing a base steel sheet;
- dipping the base steel sheet in an aluminum plating bath that contains, by wt %, 3 to 30% of Zn, 0.1 to 1.5% of Si, and a balance of Al and unavoidable impurities to obtain an aluminum-plated steel sheet;
- performing cooling by supplying air heated to 200 to 300° C. to the aluminum-plated steel sheet after the aluminum plating to form an oxide film on a surface of the aluminum-plated steel sheet;
- and
- obtaining an aluminum alloy-plated steel sheet by on-line alloying in which a heat treatment is performed after the cooling while maintaining the aluminum-plated steel sheet in a heating temperature range of 550° C. or higher and lower than 650° C. for 1 to 20 seconds.
2 more elements
Dependencies are inferred from the claim text.