公开(公告)号：US20230366058A1

公开(公告)日：2023-11-16

申请号：US18033376

申请日：2020-11-27

Applicant: NIPPON STEEL CORPORATION

Inventor： Yoshihiro ARITA ,  Shinichi MATSUI

IPC: C21D9/46 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C21C7/00 ,  C21D8/12 ,  C21D6/00 ,  H01F1/147

CPC classification number: C21D9/46 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/008 ,  C22C38/005 ,  C22C38/004 ,  C22C38/002 ,  C22C38/001 ,  C21C7/0006 ,  C21D8/1205 ,  C21D8/1222 ,  C21D8/1233 ,  C21D8/1261 ,  C21D8/1277 ,  C21D6/005 ,  C21D6/008 ,  H01F1/14766 ,  C22C2202/02

Abstract: A non-oriented electrical steel sheet is provided which has a chemical composition that contains, in mass%, C: 0.0050% or less, Si: 0.10 to 1.50%, Mn: 0.10 to 1.50%, sol. Al: 0.0050% or less, N: 0.0030% or less, S: 0.0040% or less, and O: 0.0050 to 0.0200%, and contains one or more elements selected from a group of La, Ce, Zr, Mg and Ca in a total amount of 0.0005 to 0.0200%, with the balance being Fe and impurities. A number density N of suitable oxide particles is 3.0×103 to 10×103 particles/cm2, and a number density n of oxide particles containing La and the like satisfies the expression n/N≥0.01.

公开(公告)号：US20220154304A1

公开(公告)日：2022-05-19

申请号：US17437703

申请日：2019-03-20

Applicant: NIPPON STEEL CORPORATION

Inventor： Masaru TAKAHASHI ,  Takeru ICHIE ,  Tesshu MURAKAWA ,  Shinichi MATSUI ,  Fuminobu MURAKAMI

IPC: C21D9/46 ,  C22C38/16 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C23G1/08 ,  C21D8/12 ,  C21D8/00 ,  C21D6/00 ,  H01F1/147

Abstract: A non oriented electrical steel sheet consists of a silicon steel sheet and an insulation coating. The silicon steel sheet includes an internally oxidized layer containing SiO2 in a surface thereof, an average thickness of the internally oxidized layer is 0.10 to 5.0 μm, and a vickers hardness in the internally oxidized layer is 1.15 to 1.5 times as compared with a vickers hardness in a thickness central area.

公开(公告)号：US20220145418A1

公开(公告)日：2022-05-12

申请号：US17437726

申请日：2019-03-20

Applicant: NIPPON STEEL CORPORATION

Inventor： Takeru ICHIE ,  Masaru TAKAHASHI ,  Fuminobu MURAKAMI ,  Shinichi MATSUI ,  Masahiro YAMAMOTO

IPC: C21D9/46 ,  C22C38/16 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C21D8/12 ,  C21D8/00 ,  C21D6/00 ,  H01F1/147 ,  H01F41/02

Abstract: A non oriented electrical steel sheet consists of a silicon steel sheet and an insulation coating. The silicon steel sheet contains Si, Al, and Mn as chemical composition, and an alignment degree to {5 5 7} orientation in a central area along a thickness direction of the silicon steel sheet is 12 to 35.