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公开(公告)号：EP4332261A1
公开(公告)日：2024-03-06
申请号：EP22795322.1
申请日：2022-03-14
摘要： High strength steel sheet and plated steel sheet having high plateability, LME resistance, and hydrogen embrittlement resistance, that is, steel sheet containing C: 0.05 to 0.40%, Si: 0.2 to 3.0%, Mn: 0.1 to 5.0%, and sol. Al: 0.4 to 1.50%, having an internal oxidation layer including fine granular oxides in a surface layer of the steel sheet, a number density of fine granular oxides in the internal oxidation layer being 4.0/µm 2 or more, and including a surface depleted layer with a steel composition not including oxides which satisfies, by mass%, Si≤0.6% and Al≥0.05% at a depth of 1/2 of the average depth of the internal oxidation layer calculated from the cross-sectional SEM image of the steel sheet, and a plated steel sheet using the same.
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公开(公告)号：EP4112766A1
公开(公告)日：2023-01-04
申请号：EP20921525.0
申请日：2020-02-27
IPC分类号： C23C2/06 , B21D22/20 , C22C18/04 , C22C21/10 , C23C2/12 , C21D1/18 , C21D9/00 , C22C38/00 , C22C38/06 , C22C38/58 , C23C2/02 , C23C2/26 , C23C2/28 , C23C28/02
摘要： A hot stamped body comprising a steel base material and an Al-Zn-Mg-based plating layer formed on a surface of the steel base material, wherein the plating layer has a predetermined chemical composition, the plating layer comprises an interfacial layer positioned at an interface with the steel base material and containing Fe and Al and a main layer positioned on the interfacial layer, the main layer comprises, by area ratio, 10.0 to 70.0% of an Mg-Zn containing phase and 30.0 to 90.0% of an Fe-Al containing phase, the Mg-Zn containing phase comprises at least one selected from the group consisting of an MgZn phase, Mg 2 Zn 3 phase, and MgZn 2 phase, and the Fe-Al containing phase comprises an FeAl phase and Fe-Al-Zn phase and an area ratio of the Fe-Al-Zn phase in the main layer is more than 10.0 to 75.0%.
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3.发明公开
公开(公告)号：EP4082687A1
公开(公告)日：2022-11-02
申请号：EP21761781.0
申请日：2021-02-24
发明人： FUJITA, Soshi , SUZUKI, Yuki , FUDA, Masahiro , IRIKAWA, Hideaki , MAKI, Jun , YOSHIKAWA, Nobuo , NOMURA, Naruhiko
摘要： To solve a problem about warpage of a steel sheet due to a difference in temperature raising rate between an overlapped part and a one-sheet part. This manufacturing method includes: a step of heating an overlapped blank; a step of transferring the heated overlapped blank; and a step of performing presswork on the heated overlapped blank by using a die, in which in the heating step, when sheet thicknesses of the first and second steel sheets are set to t1 and t2, respectively, and an average heating rate at a sheet temperature from 20 to 800°C of a portion with a total sheet thickness (tl + t2) of an overlapped portion, and that of a non-overlapped portion are set to V and vl, respectively, the total sheet thickness (tl + t2) is 2.5 to 5.0 mm, a maximum length L of the overlapped portion is 100 to 1100 mm, an area S1 of the first steel sheet, an area S2 of a portion, of the second steel sheet, which is overlapped with the first steel sheet, and the average heating rates V and v1 satisfy Expressions (1) to (3), and the heating is performed at a heating temperature and for a heating time within a specific range on a plane of coordinates defined by the heating time and the heating temperature.
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公开(公告)号：EP3992323A1
公开(公告)日：2022-05-04
申请号：EP20831769.3
申请日：2020-04-16
发明人： TOKUDA, Kohei , SAITO, Mamoru , MAKI, Jun , MITSUNOBU, Takuya , GOTO, Yasuto
摘要： A hot-dip coated steel product including: a steel product; and a coating layer including a Zn-Al-Mg alloy layer disposed on a surface of the steel product, in which the Zn-Al-Mg alloy layer includes a Zn phase, an Al phase, and a MgZn 2 phase, and contains a Mg-Sn intermetallic compound phase in the Zn phase, and the coating layer has a chemical composition satisfying a predetermined average composition, a total area proportion of the Al phase and the MgZn 2 phase is 70% or more, an area proportion of the Zn phase is 30% or less, an average value of cumulative circumferential lengths of the Al phase is less than 88 mm/mm 2 , and a total frequency in number of the Al phase having a circumferential length of 50 jim or more is less than 100.
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公开(公告)号：EP4332262A1
公开(公告)日：2024-03-06
申请号：EP22795323.9
申请日：2022-03-14
摘要： High strength steel sheet and plated steel sheet having high plateability, LME resistance, and hydrogen embrittlement resistance, that is, steel sheet containing C: 0.05 to 0.40%, Si: 0.2 to 3.0%, Mn: 0.1 to 5.0%, and sol. Al: 0.4 to 1.50%, having an internal oxidation layer including fine granular oxides, coarse granular oxides, and grain boundary oxides in a surface layer of the steel sheet, a number density of fine granular oxides in the internal oxidation layer being 4.0/µm 2 or more, a number density of coarse granular oxides in the internal oxidation layer being 4.0/25 µm 2 or more, having a Ratio A of the length of the grain boundary oxides projected on the surface of the steel sheet to the length of the surface of the steel sheet when examining a cross-section of the surface layer of the steel sheet being 50% or more and 100% or less, and including a surface depleted layer with a steel composition not including oxides which satisfies, by mass%, Si≤0.6% and Al≥0.05% at a depth of 1/2 of the average depth of the internal oxidation layer calculated from the cross-sectional SEM image of the steel sheet, and a plated steel sheet using the same.
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公开(公告)号：EP4261293A1
公开(公告)日：2023-10-18
申请号：EP22781081.9
申请日：2022-03-30
发明人： FUJII, Hiroyasu , MAKI, Jun , TAKEDA, Kazutoshi , AKAGI, Akira , FUJII, Yuya
摘要： A non-oriented electrical steel sheet according to an embodiment of the present invention is a non-oriented electrical steel sheet including a base metal steel sheet and a composite coating film that is formed on surfaces of the base metal steel sheet and includes Zn-containing phosphate and an organic resin, wherein the non-oriented electrical steel sheet contains crystalline aluminum phosphate showing diffraction lines belonging to ICDD No. 01-074-3256 when the composite coating film is measured by a wide-angle X-ray diffraction method.
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公开(公告)号：EP4063534A1
公开(公告)日：2022-09-28
申请号：EP20890069.6
申请日：2020-11-20
IPC分类号： C23C22/00
摘要： A non-oriented electrical steel sheet according to one embodiment of the present invention includes a base metal steel sheet, and a composite coating film composed of a Zn-containing phosphate and an organic resin, the composite coating film being formed on a surface of the base metal steel sheet, wherein: a content of Zn in the composite coating film is 10 mg/m 2 or more per side; and the product of an amount of oxygen in the base metal steel sheet and a sheet thickness of the base metal steel sheet is 50 ppm·mm or less.
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公开(公告)号：EP2312005B1
公开(公告)日：2020-01-15
申请号：EP09794559.6
申请日：2009-07-13
发明人： MAKI, Jun , ABE, Masayuki , KUSUMI, Kazuhisa , TSUKANO, Yasushi
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公开(公告)号：EP2816139B1
公开(公告)日：2019-10-09
申请号：EP13749244.3
申请日：2013-02-08
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公开(公告)号：EP4332251A1
公开(公告)日：2024-03-06
申请号：EP21939232.1
申请日：2021-04-27
IPC分类号： C21D9/46 , C22C18/00 , C22C21/10 , C25F1/06 , C22C38/00 , C22C38/58 , B23K11/11 , B23K11/16 , C23C2/02
摘要： A steel welded member comprising a plurality of Zn-based plated steel materials, each having a Zn-based plating layer on a surface of a steel material, joined together through at least one spot weld, wherein the steel material contains, by mass%, C: 0.05 to 0.40%, Si: 0.2 to 3.0%, and Mn: 0.1 to 5.0%, the steel welded member includes, by area ratio, 20 to 80% of a Γ phase (Fe 3 Zn 1 0 ) and at least one oxide with a long axis of 0.5 µm or more in a region up to 0.5 mm from an end part of a pressure weld of the spot weld.
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