HIGH STRENGTH HOT-DIP GALVANIZED STEEL SHEET HAVING EXCELLENT COATABILITY AND METHOD OF MANUFACTURING SAME
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United States of America Patent
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Feb 8, 2024
app pub date -
Dec 9, 2021
filing date -
Dec 18, 2020
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Abstract
One embodiment of the present invention provides a high-strength hot-dip galvanized steel sheet having excellent coatability and a manufacturing method therefor, the hot-dip galvanized steel sheet having a base steel sheet and a hot-dip galvanized layer formed on one or both surfaces of the base steel sheet, wherein the base steel sheet comprises an internal oxide layer comprising, by weight %, carbon (C): 0.1% to 0.3%, silicon (Si): 0.1% to 2.0%, aluminum (Al): 0.1% to 1.5%, manganese (Mn): 1.5% to 3.0%, and the balance being Fe and unavoidable impurities, wherein the sum of Si and Al satisfies 1.2% to 3.5%, the ratio of Al and Si (Al/Si) satisfies 0.5 to 2.0, the surface roughness (Ra) of the base steel sheet is 0.5 or more, and the thickness directly under the surface of the base steel sheet is less than 4 μm.
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