公开(公告)号：US20180073157A1

公开(公告)日：2018-03-15

申请号：US15564980

申请日：2016-04-13

申请人： NIPPON STEEL & SUMITOMO METAL CORPORATION

发明人： Akinobu KOBAYASHI ,  Yasuto GOTO ,  Takashi FUTABA ,  Kenichiro MATSUMURA

IPC分类号： C25D5/50 ,  C22C19/05 ,  C22C27/06 ,  B32B15/01 ,  C25D3/04 ,  C25D3/12 ,  C25D5/14

摘要： [Object] To provide a plated steel sheet excellent in heat resistance and productivity and a method for producing the same.[Solution] According to an aspect of the present invention, there is provided a plated steel sheet including: a steel sheet; and an alloy plating layer formed on a surface of the steel sheet, in which the alloy plating layer consists of, in mass %, Cr: 5 to 91%, Fe: 0.5 to 10%, and the balance: Ni and unavoidable impurities, the Ni concentration in the alloy plating layer gradually decreases from an outermost surface of the alloy plating layer to a side of the steel sheet, the ratio of the Ni concentration to the Cr concentration is Ni/Cr>1 in an area extending 300 nm or more from the outermost surface of the alloy plating layer, the Fe concentration in the alloy plating layer gradually decreases from the side of the steel sheet to the outermost surface of the alloy plating layer, the Fe concentration in the outermost surface of the alloy plating layer is 0.5% or less, the total thickness of an alloy layer formed in the alloy plating layer and containing Cr and Fe is 500 to 2000 nm, and the total amount of the alloy plating layer deposited to the steel sheet is 4.5 to 55.5 g/m2.

公开(公告)号：US20180237900A1

公开(公告)日：2018-08-23

申请号：US15752734

申请日：2016-09-29

申请人： NIPPON STEEL & SUMITOMO METAL CORPORATION

发明人： Akinobu KOBAYASHI ,  Kohei TOKUDA ,  Nobuyuki SHIMODA ,  Yasuto GOTO ,  Kenichiro MATSUMURA

IPC分类号： C23C14/16 ,  B32B15/01

CPC分类号： C23C14/16 ,  B32B15/012 ,  B32B15/013 ,  B32B15/017 ,  B32B2311/20 ,  B32B2311/24 ,  B32B2311/30 ,  C22C18/00 ,  C22C18/04 ,  C22C21/00 ,  C22C21/06 ,  C22C21/10 ,  C22C23/02 ,  C22C23/04 ,  C22C30/06 ,  C23C14/021 ,  C23C14/30

摘要： The invention provides a coated steel including a steel, a coated metal layer coated on a surface of the steel, and an interfacial alloy layer formed at the boundary between the steel and the coated metal layer, in which the composition of the coated metal layer includes in terms of % by mass Zn from 20 to 83%, and Al from 2.5 to 46.5% as well as Mg and impurities as the balance, in which the Mg content is 10% or more, in which the structure of the coated metal layer includes a quasicrystalline phase, a MgZn2 phase, and a balance structure, in which the area fraction of the quasicrystalline phase is from 30 to 60%, and not less than 90 number-% of the quasicrystalline phases are a quasicrystalline phase having a particle diameter in the major axis direction of from 0.05 to 1.0 μm, and in which the thickness of the coated metal layer is 0.1 μm or more, and the thickness of the interfacial alloy layer is 500 nm or less.