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公开(公告)号：EP3845682A1
公开(公告)日：2021-07-07
申请号：EP19853495.0
申请日：2019-08-23
申请人： POSCO
发明人： LEE, Suk-Kyu , PARK, Il-Jeong , KIM, Myung-Soo
IPC分类号： C23C2/12 , C23C2/28 , C23C2/20 , C23C2/40 , C22C21/00 , C22C21/10 , C22C38/04 , C22C38/06 , C22C38/02
摘要： Provided are an aluminum-zinc alloy plated steel sheet having excellent hot workability and corrosion resistance, and a method for manufacturing same. The present invention relates to an Al-Zn alloy plated steel sheet having excellent hot workability and corrosion resistance, the plated steel sheet having an Al-Zn hot-dip aluminized coating layer on a base steel sheet, wherein: the coating layer is composed of a lower layer part and an upper layer part; the lower layer part comprises 40-50% of Fe, 50-60% of Al, 1% or less of Si, and other unavoidable impurities, on the basis of wt% of the lower layer part itself; the upper layer part comprises 10-30% of Zn, the balance of Al, and 0.05% or less of at least one of Cr, Mo, and Ni as an impurity, on the basis of wt% of the upper layer part itself; and the thickness of the upper layer part accounts for 30% or less of the total thickness of the coating layer.
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2.发明公开
公开(公告)号：EP4265808A1
公开(公告)日：2023-10-25
申请号：EP21906975.4
申请日：2021-12-09
申请人： POSCO Co., Ltd
发明人： KIM, Young-Ha , LEE, Suk-Kyu , HAN, Tae-Kyo , KANG, Dae-Young
摘要： 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 µm or more, and the thickness directly under the surface of the base steel sheet is less than 4 µm.
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3.发明公开
公开(公告)号：EP3859045A1
公开(公告)日：2021-08-04
申请号：EP19867287.5
申请日：2019-09-20
申请人： POSCO
发明人： PARK, Il-Jeong , KIM, Myung-Soo , LEE, Suk-Kyu
摘要： The present invention relates to a highly corrosion-resistant plated steel sheet having plating adhesion and resistance to liquid metal embrittlement. A highly corrosion-resistant plated steel sheet according to one aspect of the present invention can comprise a base steel sheet and a plated layer, which sequentially comprises an Fe-Al alloy layer and an MgZn 2 layer from an interface with the base steel sheet.
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公开(公告)号：EP4265814A1
公开(公告)日：2023-10-25
申请号：EP21907083.6
申请日：2021-12-15
申请人： POSCO Co., Ltd
发明人： LEE, Suk-Kyu , OH, Jong-Gi , KIM, Myung-Soo
摘要： The present invention relates to an aluminum coated steel sheet having excellent anti-corrosion properties and weldability, and a manufacturing method thereof. The aluminum coated steel sheet according to one aspect of the present invention includes: an austenitic base steel sheet including at least 70 area% of an austenite microstructure; and an aluminum coating layer formed on the base steel sheet, wherein the base steel sheet includes at least 80 area% of ferrite in a surface layer portion, which denotes a region extending from the interface with the coating layer to a depth of 100 µm into the base steel sheet, and the aluminum coating layer may have a composition comprising 2-12 wt% of Si, 5-30 wt% of Zn, and 0.1-5 wt% of Mn, with the balance being Al and inevitable impurities.
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5.发明公开
公开(公告)号：EP3561135A1
公开(公告)日：2019-10-30
申请号：EP17884229.0
申请日：2017-12-21
申请人： POSCO
发明人： LEE, Suk-Kyu , KIM, Sang-Heon , MIN, Kwang-Tai , SONG, Yon-Kyun
摘要： Disclosed are a hot-dipped galvanized steel material and a method for manufacturing the same. The hot-dipped galvanized steel material comprises an iron substrate and a hot-dipped galvanizing layer formed on the iron substrate, wherein the hot-dipped galvanizing layer comprises, by wt%, 0.01 to 0.5% of Al, 0.01 to 1.5% of Mg, 0.05 to 1.5% of Mn, 0.1 to 6% of Fe, and the balance of Zn and inevitable impurities, with a Zn-Fe-Mn based alloy phase present at the interface between the iron substrate and the hot-dipped galvanizing layer, and an area ratio of the Zn-Fe-Mn-based alloy phase to the hot-dipped galvanizing layer ranging from 1 to 60%.
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公开(公告)号：EP4071273A1
公开(公告)日：2022-10-12
申请号：EP20897197.8
申请日：2020-12-01
申请人： POSCO
发明人： JUNG, Woo-Sung , PARK, Sang-Hoon , LEE, Suk-Kyu
摘要： The present invention relates to a steel sheet plated with an Al alloy and a manufacturing method therefor and, more specifically, to a steel sheet plated with an Al alloy which can be preferably applied as a vehicle steel sheet and the like and a manufacturing method therefor. An embodiment of the present invention provides a steel sheet plated with Al alloy and a manufacturing method therefor, wherein the steel sheet comprises: a base steel plate; an Al alloy plating layer formed on at least one surface of the base steel plate; and a Zn-Al plating layer which is formed on the Al alloy plating layer and comprises, by weight%, 0.5-1.0% of Al and the balance of Zn and inevitable impurities, with a plating adhesion amount of 3-12 g/m 2.
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7.发明公开
公开(公告)号：EP3730665A1
公开(公告)日：2020-10-28
申请号：EP18892684.4
申请日：2018-12-18
申请人： POSCO
发明人： LEE, Suk-Kyu , PARK, Il-Jeong , KIM, Myung-Soo
摘要： The present invention relates to an aluminum alloy-plated steel sheet having excellent resistance to welding liquation brittleness and excellent plating adhesion. An aluminum alloy-plated steel sheet according to one aspect of the present invention may include: a base steel sheet; and an aluminum alloy plating film including, in wt%, 5-30% of Zn, 0.5-5% of Mg, and 0.01-3% of Mn.
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8.发明公开
公开(公告)号：EP3730664A1
公开(公告)日：2020-10-28
申请号：EP18892672.9
申请日：2018-12-17
申请人： POSCO
发明人： LEE, Suk-Kyu , PARK, Il-Jeong , KIM, Myung-Soo
摘要： The present invention relates to a molten aluminum alloy-plated steel sheet having excellent corrosion resistance and weldability, and a method for producing same. A plated steel sheet according to one aspect of the present invention may be a molten aluminum alloy-plated steel sheet having excellent corrosion resistance and weldability and comprising a molten aluminum alloy plating film including: an interface alloy layer present at the interface with the steel sheet; and a plating upper layer disposed on the interface alloy layer, wherein a phase having an atomic ratio between Fe and Al of between 1:2.8-1:3.3 constitutes at least 70% by area of the phases present within 1 µm in the interface alloy layer direction from the boundary between the interface alloy layer and a base steel sheet.
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公开(公告)号：EP3502299A1
公开(公告)日：2019-06-26
申请号：EP17843919.6
申请日：2017-08-22
申请人： Posco
发明人： KIM, Sang-Heon , HWANG, Hyeon-Seok , LEE, Suk-Kyu , JEON, Sun-Ho , SONG, Yon-Kyun , YOO, Bong-Hwan
摘要： The present invention relates to a hot-rolled galvanizing steel sheet having excellent galling resistance and formability, and a method for manufacturing the same. According to an embodiment of the present invention, provided is a hot-rolled galvanizing steel sheet, comprising: a base steel; and a hot-rolled galvanizing layer formed on the surface of the base steel, wherein the hot-rolled galvanizing layer provides a hot-rolled galvanizing steel sheet having a Mn crystallite having a size of 10 µm or less between the resin dendrites of zinc that form sequins, and in addition, provided is a method for manufacturing a hot-rolled galvanizing steel sheet comprising: depositing a steel sheet to be plated in a hot-rolled galvanizing solution at a temperature of 440 ° C to 480 ° C containing 0.05 to 0.6 wt% of manganese, 99 wt% or more of zinc and unavoidable impurities, applying the plating solution to the same and taking out the same therefrom; then cooling the steel sheet applied with the hot-rolled galvanizing solution to solidify the plating solution and form a plating layer, wherein the cooling is performed at a cooling rate of -10° C/s or lower in a section where a steel sheet has a temperature of 430° C to 410° C.
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