公开(公告)号：US20250101542A1

公开(公告)日：2025-03-27

申请号：US18728222

申请日：2023-01-20

Applicant: JFE STEEL CORPORATION

Inventor： Yoshiaki ZAIZEN ,  Takeshi NISHIYAMA ,  Nobuko NAKAGAWA ,  Tomoyuki OKUBO ,  Tomohiro AOYAMA

IPC: C21D9/46 ,  C21D6/00 ,  C21D8/12 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/10 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/26 ,  C22C38/30 ,  C22C38/34 ,  C22C38/42 ,  C22C38/48 ,  C22C38/50 ,  C22C38/52 ,  H01F1/147

Abstract: Provided is a non-oriented electrical steel sheet with low high-frequency iron loss without addition of a large amount of alloying elements such as Cr, which causes a decrease in magnetic flux density, and without reduction of the sheet thickness, which causes a decrease in productivity. A non-oriented electrical steel sheet comprises a certain chemical composition containing 0.0005 mass % to 0.0050 mass % of Co, wherein at at least one surface of the non-oriented electrical steel sheet, an amount of N existing as AlN in a range from the surface to a depth of 1/20 of a thickness of the non-oriented electrical steel sheet is 0.003 mass % or less, and the surface has an oxide layer containing one or both of Al and Si and having a thickness of 80 nm to 200 nm.

公开(公告)号：US20250066640A1

公开(公告)日：2025-02-27

申请号：US18723915

申请日：2022-09-21

Applicant: JFE Steel Corporation

Inventor： Shinichi FURUYA ,  Tomohiro AOYAMA ,  Shun KOIBUCHI ,  Takeshi MATSUDA

IPC: C09D191/06 ,  C09D7/65 ,  C23C2/06 ,  C23C2/40

Abstract: A galvanized steel sheet to be subjected to complicated and difficult press forming is provided. A method for producing such a galvanized steel sheet is also provided. On a surface of a galvanized steel sheet having a metallic zinc layer with a coating weight of 5 g/m2 or more, a film is formed that contains 10 mass % or more of a polyolefin wax having a melting point of 120° C. or above and 140° C. or below and an average particle size of 3.0 μm or less, and at least one organic resin selected from acrylic resins, epoxy resins, urethane resins, phenolic resins, vinyl acetate resins, and polyester resins, in such a way that the coating weight W (g/m2) of the film per side and the arithmetic average roughness Ra (μm) of the surface of the metallic zinc layer satisfy a relationship of W≥0.12×Ra2+0.1.

公开(公告)号：US20250066625A1

公开(公告)日：2025-02-27

申请号：US18848572

申请日：2023-01-24

Applicant: JFE STEEL CORPORATION

Inventor： Tomohiro AOYAMA ,  Shinichi FURUYA ,  Takeshi MATSUDA ,  Haruo NAKAMICHI

IPC: C09D7/65 ,  C09D7/40 ,  C09D133/00 ,  C09D163/00 ,  C09D175/04 ,  C09D187/00

Abstract: A steel sheet having a lubrication film that is to be subjected to complex forming in which press forming is difficult, and a method for manufacturing the steel sheet, are disclosed. The steel sheet has an organic resin coating film which has an indentation reduced Young's modulus of 20 GPa or higher and 50 GPa or lower and an indentation hardness of 0.5 GPa or higher and 1.5 GPa or lower or which has an indentation reduced Young's modulus of 10 GPa or higher and less than 20 GPa and an indentation hardness of 0.2 GPa or higher and 0.5 GPa or lower and which has a coating weight per side of 0.2 g/m2 or more and 2.0 g/m2 or less on a surface thereof.