公开(公告)号：US20190292623A1

公开(公告)日：2019-09-26

申请号：US16432274

申请日：2019-06-05

Applicant: JFE STEEL CORPORATION

Inventor： Masayasu NAGOSHI ,  Tomohiro MATSUSHIMA ,  Makoto WATANABE ,  Shigehiro TAKAJO ,  Toshito TAKAMIYA ,  Masanori UESAKA ,  Takashi TERASHIMA

IPC: C21D9/46 ,  C22C38/02 ,  C21D8/12 ,  H01F27/245 ,  H02K1/02 ,  H02K1/06 ,  H01F1/18 ,  H01F1/16 ,  G01N21/62 ,  G01N23/225 ,  G01N23/2251

Abstract: A grain oriented electrical steel sheet comprising a grain oriented electrical steel sheet having a surface and a forsterite film formed on the surface of the steel sheet, wherein a total area percentage of defective parts scattered on the forsterite film is less than 1.5% relative to a surface area of the forsterite film when viewed from above the surface, and methods for evaluating a grain oriented electrical steel sheet comprising a grain oriented electrical steel sheet having a surface and a forsterite film formed on the surface of the steel sheet.

公开(公告)号：US20170240987A1

公开(公告)日：2017-08-24

申请号：US15514746

申请日：2015-09-11

Applicant: JFE STEEL CORPORATION

Inventor： Masayasu NAGOSHI ,  Tomohiro MATSUSHIMA ,  Makoto WATANABE ,  Shigehiro TAKAJO ,  Toshito TAKAMIYA ,  Masanori UESAKA ,  Takashi TERASHIMA

IPC: C21D9/46 ,  C21D8/12 ,  H01F27/245 ,  G01N21/62 ,  H02K1/02 ,  H02K1/06 ,  G01N23/225 ,  C22C38/02 ,  H01F1/18

Abstract: A grain oriented electrical steel sheet comprising a grain oriented electrical steel sheet having a surface and a forsterite film formed on the surface of the steel sheet, wherein a total area percentage of defective parts scattered on the forsterite film is less than 1.5% relative to a surface area of the forsterite film when viewed from above the surface, and methods for evaluating a grain oriented electrical steel sheet comprising a grain oriented electrical steel sheet having a surface and a forsterite film formed on the surface of the steel sheet.