公开(公告)号：US20220145425A1

公开(公告)日：2022-05-12

申请号：US17434988

申请日：2020-04-16

Applicant: NIPPON STEEL CORPORATION

Inventor： Takuya MITSUNOBU ,  Jun MAKI ,  Hiroshi TAKEBAYASHI ,  Takehiro TAKAHASHI ,  Kohei TOKUDA

IPC: C22C18/04 ,  C23C2/06 ,  C23C2/02

Abstract: A plated steel sheet includes: a steel sheet; and a plating layer that is formed on at least a part of a surface of the steel sheet, in which a chemical composition of the plating layer includes, by mass %, Al: more than 5.00% and 35.00% or less, Mg: 3.00% to 15.00%, Si: 0% to 2.00%, Ca: 0% to 2.00%, and a remainder of Zn and impurities, in which in a cross section of the plating layer in a thickness direction, the area ratio of a lamellar structure in which an (Al—Zn) phase and a MgZn2 phase are arranged in layers is 10% to 90%, a lamellar spacing of the lamellar structure is 2.5 μm or less, and the area ratio of an (Al—Zn) dendrite is 35% or less.

公开(公告)号：US20220112589A1

公开(公告)日：2022-04-14

申请号：US17421954

申请日：2020-04-16

Applicant: NIPPON STEEL CORPORATION

Inventor： Takuya MITSUNOBU ,  Jun MAKI ,  Hiroshi TAKEBAYASHI ,  Takehiro TAKAHASHI ,  Kohei TOKUDA

IPC: C23C2/06 ,  C23C2/40 ,  C23C2/28 ,  C22C18/04 ,  C22C21/00

Abstract: A plated steel sheet having excellent post-coating corrosion resistance includes: a steel; and a plating layer that is provided on a surface of the steel, in which the plating layer includes, by mass %, Al: 5.00% to 35.00%, Mg: 2.50% to 13.00%, Fe: 5.00% to 35.00%, Si: 0% to 2.00%, Ca: 0% to 2.00%, and a remainder consisting of Zn and impurities, and in a cross section of the plating layer, the area fraction of a Fe2Al5 phase is 5.0% to 60.0%, the area fraction of an eutectic structure of Zn and MgZn2 is 10.0% to 80.0%, the area fraction of a massive MgZn2 phase is 5.0% to 40.0%, and the area fraction of a remainder is 10.0% or less.

公开(公告)号：US20210039355A1

公开(公告)日：2021-02-11

申请号：US16977042

申请日：2018-03-20

Applicant: NIPPON STEEL CORPORATION

Inventor： Takuya MITSUNOBU ,  Kohei TOKUDA ,  Akihiro SENGOKU ,  Kenichiro MATSUMURA

IPC: B32B15/01 ,  C22C18/00 ,  C22C38/00 ,  B32B15/18 ,  B32B15/20 ,  C23C2/12 ,  C22C38/32 ,  C22C38/02 ,  C22C38/04 ,  C22C38/28 ,  B21D22/02

Abstract: There is provided a hot-stamped body including: a steel base metal; and a metallic layer formed on a surface of the steel base metal, wherein the metallic layer includes: an interface layer that contains, in mass %, Al: 30.0 to 36.0%, has a thickness of 100 nm to 15 μm, and is located in an interface between the metallic layer and the steel base metal; and a principal layer that includes coexisting Zn phases and insular FeAl2 phases, is located on the interface layer, and has a thickness of 1 μm to 40 μm. This hot-stamped body is excellent in fatigue properties, corrosion resistance, and chipping resistance.