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公开(公告)号：EP4286541A1
公开(公告)日：2023-12-06
申请号：EP22771478.9
申请日：2022-03-16
摘要： This steel sheet includes: a base steel sheet having a predetermined chemical composition; and a scale formed on a surface of the base steel sheet, in which the base steel sheet has a decarburized layer formed on a side of an interface with the scale, the decarburized layer has an internal oxidized layer formed on the side of the interface with the scale, a depth of the decarburized layer from an interface between the base steel sheet and the scale is 90 µm or more, a depth of the internal oxidized layer from the interface is less than 30 µm, and the scale contains 80% or more of Fe by mass%.
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公开(公告)号：EP4105344A1
公开(公告)日：2022-12-21
申请号：EP21752984.1
申请日：2021-02-12
IPC分类号： C21D9/00 , C21D9/46 , C22C21/00 , C22C21/02 , C22C38/00 , C22C38/60 , B23K11/11 , B23K11/16 , B23K11/24 , C23C2/12 , C23C2/26
摘要： This joint component is a joint component including a first steel member, a second steel member, and a spot-welded portion that joins the first steel member and the second steel member, in which the first steel member includes a steel sheet substrate having a predetermined chemical composition and a coating that is formed on a surface of the steel sheet substrate, contains A1 and Fe, and has a thickness of 25 µm or more, in a cross section in a thickness direction of the first steel member and the second steel member including the spot-welded portion, a filled metal containing Al and Fe is present in a gap between the first steel member and the second steel member in a periphery of the spot-welded portion, in the cross section, the filled metal has a cross-sectional area of 3.0 × 10 4 µm 2 or more, and has a filling ratio of 80% or more in the gap in a range of 100 µm from an end portion of a corona bond formed in the periphery of the spot-welded portion, and includes a first region and a second region.
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公开(公告)号：EP3922738A1
公开(公告)日：2021-12-15
申请号：EP20752475.2
申请日：2020-02-05
发明人： TABATA, Shinichiro
IPC分类号： C21D9/00 , C21D9/46 , C22C21/00 , C23C28/02 , C22C38/00 , C22C38/60 , C21D1/18 , C23C2/02 , C23C2/12 , C23C2/40
摘要： The present invention has as its object the provision of a coated steel member and coated steel sheet excellent in hydrogen embrittlement resistance in a corrosive environment and methods for manufacturing the same. The coated steel member of the present invention is provided on its surface with an Al-Fe-based coating containing Cu and one or more of Mo, Ni, Mn, and Cr in a total by mass% of 0.12% or more by heating, cooling, and manufacturing a coated steel sheet having a layer containing Cu on its surface under predetermined conditions.
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公开(公告)号：EP3144405B1
公开(公告)日：2019-08-21
申请号：EP15793575.0
申请日：2015-05-15
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公开(公告)号：EP4230766A1
公开(公告)日：2023-08-23
申请号：EP22742591.5
申请日：2022-01-19
摘要： This steel has a steel sheet substrate and a protective film formed on at least a part of a surface of the steel sheet substrate, the chemical composition of the steel sheet substrate is, by mass%, C: 0.25% to 0.65%, Si: 0.05% to 2.00%, Mn: 0.30% to 3.00%, P: 0.050% or less, S: 0.0100% or less, N: 0.010% or less, O: 0.010% or less, Cr: 0.05% to 1.00%, and Cu: 0.10% to 1.00%, in an X-ray analysis in which measurement is carried out using a CuKα radiation, in a case where a peak intensity at a diffraction angle (2θ) position of 36.6 ± 0.5° is regarded as 100%, the protective film has a peak having a peak intensity of more than 250% at a diffraction angle (2θ) position of 35.5 ± 0.5° and a tensile strength is more than 1,500 MPa.
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公开(公告)号：EP4095272A1
公开(公告)日：2022-11-30
申请号：EP21745006.3
申请日：2021-01-19
摘要： There is provided a steel sheet including a chemical composition consisting of, in mass%: C: 0.14 to 0.60%, Si + Al ≤ 3.00, P ≤ 0.030%, S ≤ 0.0050%, N ≤ 0.015%, B ≤ 0.0050%, C × Mn ≤ 0.80, Mn + Ni + Cu + 1.3Cr + 4(Mo + W) ≥ 0.80, 0.003 ≤ Ti + Zr + Hf + V + Nb + Ta + Sc + Y ≤ 0.20, Sn + As + Sb + Bi ≤ 0.020, Mg: 0 to 0.005%, Ca: 0 to 0.005%, REM: 0 to 0.005%, with the balance: Fe and impurities, and satisfying Ms = 546 × exp(-1.362 × C) - 11 × Si - 30 × Mn - 18 × Ni - 20 × Cu - 12 × Cr - 8(Mo + W) ≥ 200, wherein a steel micro-structure includes, in volume%: martensite ≥ 85%, retained austenite ≤ 15%, and the balance: bainite, an average block size of martensite and bainite ≤ 3.0 µm, an average axial ratio of martensite and bainite: 1.0004 to 1.0100, and a yield stress is 1000 MPa or more.
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公开(公告)号：EP4063525A1
公开(公告)日：2022-09-28
申请号：EP20890642.0
申请日：2020-11-20
发明人： TABATA, Shinichiro
IPC分类号： C21D9/00 , C21D9/46 , C22C38/00 , C22C38/60 , C21D1/18 , C23C2/12 , C23C2/26 , C23C2/28 , C23C2/40
摘要： A coated steel member includes: a steel sheet substrate containing, as a chemical composition, by mass%, C: 0.25% to 0.65%, Si: 0.10% to 1.00%, Mn: 0.30% to 1.00%, P: 0.050% or less, S: 0.0100% or less, N: 0.010% or less, Ti: 0.010% to 0.100%, B: 0.0005% to 0.0100%, Nb: 0.02% to 0.10%, Mo: 0.10% to 1.00%, Cu: 0.15% to 1.00%, and Ni: 0.05% to 0.25%; and a coating formed on a surface of the steel sheet substrate and containing Al and Fe. The maximum Cu content in a range from the surface to a depth of 5.0 µm is 150% or more of the Cu content of the steel sheet substrate.
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公开(公告)号：EP3282031B1
公开(公告)日：2020-02-19
申请号：EP16776635.1
申请日：2016-04-07
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公开(公告)号：EP3282030B1
公开(公告)日：2020-02-19
申请号：EP16776634.4
申请日：2016-04-07
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公开(公告)号：EP4442849A1
公开(公告)日：2024-10-09
申请号：EP22898702.0
申请日：2022-11-29
摘要： This steel member has a predetermined chemical composition, in which, when a 1/4 position of a thickness in a thickness direction from a surface is defined as a 1/4 depth position, a metallographic structure at the 1/4 depth position includes 90% or more of martensite by volume fraction, in the metallographic structure at the 1/4 depth position, L49-56°/L4-12°, which is a ratio of a length L49-56° of grain boundaries having an angle of rotation of 49° to 56° to a length L4-12° of grain boundaries having an angle of rotation of 4° to 12° about a direction as a rotation axis, among grain boundaries of grains having a body-centered structure, is 1.10 or more, and a tensile strength of the steel member is more than 1,500 MPa.
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