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公开(公告)号：US20230304136A1
公开(公告)日：2023-09-28
申请号：US18033739
申请日：2021-11-18
发明人： Kotaro ISHII , Kohei TOKUDA , Yoshinari ISHIDA , Yasuto GOTO , Mamoru SAITO
摘要： The plated steel material is a plated steel material including a steel material and a plating layer provided on the surface of the steel material, wherein the plating layer has a predetermined average chemical composition, when the amount of Mg is % Mg and the amount of Al is % Al, % Mg/% Al is 0.80 or more, and a metal structure in a total field of view of 25,000 μm2 in a vertical cross section which is a cross section in a thickness direction of the plating layer includes 10 to 40 area % of a MgZn2 phase, 10 to 30 area % of an Al—Zn phase with a Zn content of 10% or more, 0 to 15 area % of an Al phase with a Zn content of less than 10%, and 25 area % or more of an Al/MgZn2/Zn ternary eutectic structure.
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公开(公告)号：US20230082468A1
公开(公告)日：2023-03-16
申请号：US17798246
申请日：2020-12-16
摘要： According to one aspect of the present invention, there is provided a T-joint including a first steel sheet, a second steel sheet, and a fillet welded part, in which the sheet thickness of the second steel sheet is 6.0 mm or less, the second steel sheet is stood on a first surface of the first steel sheet, the fillet welded part joins the first surface of the first steel sheet and a first surface of the second steel sheet to each other, at least one of the first surface of the first steel sheet or the first surface of the second steel sheet includes a zinc-based plating, an abutting end portion of the second steel sheet on a second surface side of the second steel sheet has an inclined surface, and in a cross section taken along a sheet thickness direction of the first steel sheet and a sheet thickness direction of the second steel sheet, the inclined surface forms an acute angle with respect to the first surface of the first steel sheet.
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公开(公告)号：US20190388995A1
公开(公告)日：2019-12-26
申请号：US16489144
申请日：2018-02-28
发明人： Shinji KODAMA , Kazuki MATSUDA , Yoshinari ISHIDA
摘要： The present invention relates to a fillet welded joint and a manufacturing method thereof, and addresses the problem of providing a fillet welded joint having excellent weld fatigue strength while suppressing low temperature cracking. In a fillet welded joint according to the present invention, a tensile strength of a base material is 980 MPa or more, a carbon equivalent is 0.36 or more and 0.60 or less, a tensile strength [MPa] is 1950 times or more of the carbon equivalent [wt%], an average carbon equivalent of weld metal is 0.45 or more and 0.65 or less, and at a prescribed position below a surface of a weld toe, a Vickers hardness HVbond at a boundary between the weld metal and a heat affected zone, an average value HVwmt of theVickers hardness of the weld metal in a position 0.1 mm or more and 0.3 mm or less to the weld metal side of the boundary, and an average value HVhaz of the Vickers hardness of the heat affected zone in a position 0.1 mm or more and 0.3 mm or less to the heat affected zone side of the boundary satisfy HVbond≤HVwmt, HVbond≥HVhaz−50, and HVhaz≤350.
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公开(公告)号：US20210222804A1
公开(公告)日：2021-07-22
申请号：US17053662
申请日：2019-05-15
发明人： Hiroki FUJIMOTO , Masanori YASUYAMA , Yujiro TATSUMI , Hiroshi FUKUCHI , Shintaro KOBAYASHI , Soshi FUJITA , Tasuku ZENIYA , Yuki SUZUKI , Yoshinari ISHIDA
IPC分类号： F16L9/17 , B21D22/02 , C22C38/38 , C22C38/32 , C22C38/28 , C22C38/06 , C22C38/02 , C22C38/00 , B32B15/01 , C23C2/12 , C23C2/26 , C23C2/40 , F16L9/02 , F16L9/16 , B23K31/02
摘要： This steel sheet includes a first coated portion in which an intermetallic compound layer and an aluminum coating layer are provided on a surface of a base steel sheet in order from the base steel sheet side, a first exposed portion in which the base steel sheet is exposed, and a second coated portion in which the intermetallic compound layer and the aluminum coating layer are provided on the surface of the base steel sheet in order from the base steel sheet side, in which in a first direction which is perpendicular to a thickness direction of the steel sheet and is directed from the first coated portion to one end edge of the steel sheet, the first coated portion, the first exposed portion, the second coated portion, and the end edge of the steel sheet are disposed in this order on one surface of the base steel sheet, at least the first coated portion, the first exposed portion, and the end edge of the steel sheet are disposed in this order on the other surface of the base steel sheet in the first direction, and when viewing a cross section parallel to each of the first direction and the thickness direction of the steel sheet, the second coated portion is provided in a lower region which is located on the surface of the base steel sheet and on an inner side of the base steel sheet in the thickness direction of the steel sheet from a virtual line extending in the first direction from a boundary between the first exposed portion and the second coated portion.
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公开(公告)号：US20200002798A1
公开(公告)日：2020-01-02
申请号：US16480976
申请日：2018-01-26
摘要： Provided is a metallic coated steel product which is less likely to experience LME and blowhole formation and is likely to exhibit an improved corrosion resistance at welding heat affected zones. The metallic coated steel product is a hot-dip metallic coated steel product including a steel product and a plating layer that is provided on a surface of the steel product and includes a Zn—Al—Mg alloy layer. In a cross-section of the Zn—Al—Mg alloy layer an area fraction of MgZn2 phase is from 45 to 75%, a total area fraction of MgZn2 and Al phases is not less than 70%, and an area fraction of Zn—Al—MgZn2 ternary eutectic structure is from 0 to 5%; and the plating layer has a predetermined chemical composition.
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