公开(公告)号：US11352684B2

公开(公告)日：2022-06-07

申请号：US17292308

申请日：2020-02-05

申请人： NIPPON STEEL CORPORATION

发明人： Shinichiro Tabata ,  Kazuhisa Kusumi ,  Kazuo Hikida ,  Hideaki Irikawa

IPC分类号： C22C38/58 ,  C21D8/02 ,  C21D9/46 ,  C22C38/00 ,  C22C38/02 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54

摘要： The present invention has as its object the provision of a steel member and steel sheet having high tensile strength and toughness and excellent in hydrogen embrittlement resistance in a corrosive environment and methods for manufacturing the same. The steel member of the present invention has predetermined chemical constituents and has a maximum value of content of Cu in a range from the surface to a depth of 0 to 30 μm of 1.4 times the content of Cu at a depth of 200 μm.

公开(公告)号：US11535916B2

公开(公告)日：2022-12-27

申请号：US16768869

申请日：2018-12-05

申请人： NIPPON STEEL CORPORATION

发明人： Soshi Fujita ,  Yuki Suzuki ,  Masahiro Fuda ,  Jun Maki ,  Hideaki Irikawa ,  Takashi Aramaki ,  Tatsuya Kubota

IPC分类号： C22C38/54 ,  C21D8/02 ,  C21D9/00 ,  C21D9/46 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/44 ,  C22C38/48 ,  C22C38/50 ,  C23C2/12 ,  C23C2/40

摘要： An aluminum-based plated steel sheet according to an aspect of the present invention includes: a base material; an aluminum-based plating layer located above the base material; and an intermetallic compound layer that is located between the base material and the aluminum-based plating layer and contains an intermetallic compound of Al and Fe, in which the base material has a chemical component within a predetermined range, the aluminum-based plating layer contains, on average, 80 mass % or more and 97 mass % or less of Al, 3 mass % or more and 15 mass % or less of Si, 0 mass % or more and 5 mass % or less of Zn, 0 mass % or more and 5 mass % or less of Fe, 0 mass % or more and 3 mass % or less in total of one or more selected from the group consisting of Mg and Ca, and impurities so that a total amount thereof is 100 mass %, an average value of a thickness of the intermetallic compound layer is 2 μm or more and 10 μm or less, a maximum value of the thickness of the intermetallic compound layer is 10 μm or more and 25 μm or less, and a standard deviation of the thickness of the intermetallic compound layer is 2 μm or more and 10 μm or less.

公开(公告)号：US11364707B2

公开(公告)日：2022-06-21

申请号：US16613981

申请日：2019-04-05

申请人： NIPPON STEEL CORPORATION

发明人： Soshi Fujita ,  Yuki Suzuki ,  Masahiro Fuda ,  Jun Maki ,  Hideaki Irikawa ,  Masahiro Nakata

IPC分类号： B23K31/02 ,  B32B15/01 ,  B21D22/02 ,  C23C2/12

摘要： To solve the problem about the difference in temperature increasing rate between an overlapped part and a one-sheet part so as to further improve the corrosion resistance of plating after hot stamping. An overlapped blank for hot stamping includes: a first steel sheet; and at least one second steel sheet connected to a surface of the first steel sheet via a welding point and smaller in area than the first steel sheet, wherein: the first steel sheet is a plated steel sheet having an aluminum-based plated layer on both faces of the first steel sheet, and the second steel sheet is a plated steel sheet having an aluminum-based plated layer on both faces of the second steel sheet; a coating weight of the aluminum-based plated layer on the first steel sheet is W1 (g/m2) in terms of an average coating weight on both the faces; a coating weight of the aluminum-based plated layer on a surface on a side not in contact with the first steel sheet in the second steel sheet is W2 (g/m2); and each of the W1 and the W2 is within a range of 20 g/m2 or more and 120 g/m2 or less, and satisfies relationships of Expression (1) and Expression (2).

公开(公告)号：US11530474B2

公开(公告)日：2022-12-20

申请号：US16634346

申请日：2019-02-15

申请人： NIPPON STEEL CORPORATION

发明人： Soshi Fujita ,  Yuki Suzuki ,  Masahiro Fuda ,  Jun Maki ,  Hideaki Irikawa ,  Tatsuya Kubota

IPC分类号： C23C2/12 ,  B32B15/10 ,  B21D22/02 ,  C21D8/02 ,  C22C21/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/30 ,  C22C38/32 ,  C22C38/42 ,  C22C38/60 ,  C23C2/28 ,  C23C2/40 ,  C23C28/02

摘要： Fe-Al-based plated hot-stamped member exhibiting excellent formed part corrosion resistance and post-coating corrosion resistance and manufacturing method. The hot-stamping member includes Fe-Al-based plated layer on one or both surfaces of a base material, the base material has a predetermined steel component, Fe-Al-based plated layer has a thickness of 10 μm or more and 60 μm or less, formed by A, B, C and D layers sequentially from a surface toward the base material, and each of the four layers is a Fe-Al-based intermetallic compound containing Al, Fe, Si, Mn and Cr for predetermined contents with the balance made up of impurities, the D layer further contains Kirkendall voids each of which cross-sectional area is 3 μm2-30 μm2 for 10 pieces/6000 μm2 or more and 40 pieces/6000 μm2 or less.