公开(公告)号：US20220243315A1

公开(公告)日：2022-08-04

申请号：US17428234

申请日：2020-02-07

Applicant: NIPPON STEEL CORPORATION

Inventor： Ichiro TANAKA ,  Takashi KATAOKA ,  Kazutoshi TAKEDA ,  Masamitsu KUBOTA ,  Hirotoshi TADA

IPC: C23C14/16 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C21D9/46 ,  C21D8/02 ,  C21D3/04

Abstract: A grain oriented electrical steel sheet includes a base steel sheet, an oxide layer, and a tension-insulation coating. When a glow discharge spectroscopy is conducted in a region from a surface of the tension-insulation coating to an inside of the base steel sheet, a sputtering time Fe0.5 at which a Fe emission intensity becomes 0.5 times as compared with a saturation value thereof and a sputtering time Fe0.05 at which a Fe emission intensity becomes 0.05 times as compared with the saturation value satisfy 0.01

公开(公告)号：US20220090242A1

公开(公告)日：2022-03-24

申请号：US17427535

申请日：2020-02-07

Applicant: NIPPON STEEL CORPORATION

Inventor： Ichiro TANAKA ,  Takashi KATAOKA ,  Kazutoshi TAKEDA ,  Masamitsu KUBOTA ,  Hirotoshi TADA

IPC: C22C38/20 ,  C22C38/34 ,  C22C38/00 ,  C22C38/04 ,  C22C38/06 ,  C21D9/46 ,  C21D8/02 ,  C21D3/04 ,  C23G1/08 ,  C22C38/60

Abstract: A grain oriented electrical steel sheet includes a base steel sheet, an oxide layer, and a tension-insulation coating. When a glow discharge spectroscopy is conducted in a region from a surface of the tension-insulation coating to an inside of the base steel sheet, a sputtering time Fe0.5 at which a Fe emission intensity becomes 0.5 times as compared with a saturation value thereof and a sputtering time Fe0.05 at which a Fe emission intensity becomes 0.05 times as compared with the saturation value satisfy (Fe0.5−Fe0.05)/Fe0.5≥0.35. A maximal point of a Cr emission intensity is included between the Fe0.05 and the Fesat. Moreover, a magnetic flux density B8 in a rolling direction of the grain oriented electrical steel sheet is 1.90 T or more.

公开(公告)号：US20210017619A1

公开(公告)日：2021-01-21

申请号：US16981126

申请日：2019-03-19

Applicant: NIPPON STEEL CORPORATION

Inventor： Nobusato MORISHIGE ,  Takashi KATAOKA ,  Haruhiko ATSUMI ,  Yasuhiro MAYUMI ,  Toshiya TAKECHI ,  Naoto MASUMITSU ,  Tomoya SUENAGA ,  Masamitsu KUBOTA ,  Hideyuki HAMAMURA ,  Kazuhiko FUKUTANI

IPC: C21D9/46 ,  C21D8/12 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/20 ,  C22C38/60 ,  C23G1/00 ,  H01F1/147

Abstract: A method for manufacturing a grain-oriented electrical steel sheet according to an aspect of the present invention includes a step of obtaining a hot-rolled steel sheet by carrying out hot rolling on a slab containing a predetermined component composition with a remainder including Fe and impurities, a step of obtaining a hot-rolled annealed sheet by carrying out hot-rolled sheet annealing as necessary, a step of carrying out pickling to obtain a pickled sheet, a step of carrying out cold rolling to obtain a cold-rolled steel sheet, a step of carrying out primary recrystallization annealing, a step of applying an annealing separating agent including MgO to a surface and then carrying out final annealing to obtain a final-annealed sheet, and a step of applying an insulating coating and then carrying out flattening annealing.