公开(公告)号：US20240091842A1

公开(公告)日：2024-03-21

申请号：US17768161

申请日：2019-11-29

Applicant: NIPPON STEEL CORPORATION

Inventor： Yuki SUZUKI ,  Soshi FUJITA ,  Jun MAKI ,  Kazuhisa KUSUMI ,  Masahiro FUDA

IPC: B21D35/00 ,  C23C2/12

CPC classification number: B21D35/007 ,  C23C2/12

Abstract: A plated steel sheet for hot stamping according to one aspect of the present invention includes a steel sheet, a plating layer formed on either surface or both surfaces of the steel sheet and having an Al content of 60 mass % or more, and a surface film layer formed on the plating layer. A thickness t of the plating layer is 10 to 60 μm. An average crystal grain diameter of the plating layer in a thickness range from an interface between the plating layer and the surface film layer to a position at ⅔ of the thickness t is 2t/3 or less and 15.0 μm or less. A surface film layer contains particles containing one or more elements selected from A group elements consisting of Sc, V, Mn, Fe, Co, Ce, Nb, Mo, and W. A total content of the A group elements is 0.01 to 10.0 g/m2. An average grain diameter of the particles containing the A group elements is 0.05 to 3.0 μm.

公开(公告)号：US20210395870A1

公开(公告)日：2021-12-23

申请号：US17292308

申请日：2020-02-05

Applicant: NIPPON STEEL CORPORATION

Inventor： Shinichiro TABATA ,  Kazuhisa KUSUMI ,  Kazuo HIKIDA ,  Hideaki IRIKAWA

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

Abstract: 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.