公开(公告)号：US11440846B2

公开(公告)日：2022-09-13

申请号：US14766560

申请日：2013-05-27

Applicant: Nippon Steel Corporation

Inventor： Regis Lemaitre ,  Ludger Lahn ,  Carsten Schepers ,  Shuichi Yamazaki ,  Kazutoshi Takeda ,  Masaru Takahashi ,  Hirohiko Sato ,  Koji Kanehashi

IPC: C04B28/34 ,  C23C22/18 ,  C23C22/20 ,  C23C22/22 ,  H01F1/18 ,  C04B14/06 ,  C23C22/74 ,  C23C22/08 ,  C21D8/12 ,  C04B111/00

Abstract: A solution for forming an insulation coating of grain-oriented electrical steel sheet includes an aqueous solution prepared by mixing a phosphate solution and colloidal silica. Chromium is not added to the aqueous solution. The colloidal silica includes silica particles surface-modified by an aluminate or is prepared by adding an aluminate to colloidal silica such as conventional colloidal silica.

公开(公告)号：US11749431B2

公开(公告)日：2023-09-05

申请号：US17795432

申请日：2021-06-17

Applicant: NIPPON STEEL CORPORATION

Inventor： Ichiro Tanaka ,  Kazutoshi Takeda ,  Minako Fukuchi ,  Shinsuke Takatani ,  Shuichi Yamazaki

IPC: H01F1/18 ,  H01F41/02 ,  B32B15/01

CPC classification number: H01F1/18 ,  B32B15/011 ,  H01F41/0206

Abstract: This electrical steel sheet includes a base steel sheet, a first insulation coating formed on a first surface of the base steel sheet and having adhesiveness, and a second insulation coating formed on a second surface of the base steel sheet which is a back surface to the first surface and having adhesiveness, in which an average pencil hardness of the first insulation coating is HB or higher and 3 H or lower, and an average pencil hardness of the second insulation coating is higher than the average pencil hardness of the first insulation coating.

公开(公告)号：US11499055B2

公开(公告)日：2022-11-15

申请号：US16760254

申请日：2018-11-13

Applicant: NIPPON STEEL CORPORATION

Inventor： Shuichi Yamazaki ,  Hiroyasu Fujii ,  Kazutoshi Takeda

IPC: C09D1/02 ,  C23C24/00 ,  H01F1/18 ,  H01F41/32 ,  C09D7/40 ,  C09D5/00 ,  C09D7/61

Abstract: A coating solution for forming an insulating film for a grain-oriented electrical steel sheet which contains one or more types of hydrous silicate powders having an average particle size of 2 μm or less, and one or more types of phosphoric acids and phosphates satisfying a relation of ΣniMi/ΣPi≤0.5, and satisfies (Formula 1). 1.5≤(ΣniMi+Σn′jM′j)/ΣPi≤15  (Formula 1) (P represents the number of moles of phosphorus, M represents the number of moles of metal ions derived from the phosphate, n represents the valence of the metal ions derived from the phosphate, i represents the number of types of phosphates, M′ represents the number of moles of metal elements in the hydrous silicate, n′ represents the valence of the metal elements in the hydrous silicate, and j represents the number of types of hydrous silicates).