Electrical steel sheet and its manufacturing method

Japanese Patent JP6319522

B2

Provided are an electrical steel sheet having a high saturation magnetic flux density and a low iron-loss at high frequencies and a method for producing the electrical steel sheet. The electrical steel sheet includes, with a symmetry plane being the center of the steel sheet in the thickness direction, a surface part in which the Si concentration in the steel sheet changes continuously from a high Si concentration to a low Si concentration in the thickness direction of the steel sheet from the surface of the steel sheet, a boundary part in which the Si concentration changes discontinuously, and an inner part in which the Si concentration does not change substantially in the thickness direction of the steel sheet, the inner part including the center of the steel sheet in the thickness direction. An in-plane tensile stress is generated in the surface part. An in-plane compressive stress is generated in the inner part. The average aspect ratio of crystal grains included in the surface part, that is, the ratio of the dimension of the crystal grains in a direction parallel to the surface of the steel sheet to the dimension of the crystal grains in a direction (depth direction) perpendicular to the surface of the steel sheet, is 0.7 or more and 4.0 or less.

Hiraya Tatsuhiko
Yoshihiko Oda
Zaizen Yoshiaki

JP2017541118A

May 09, 2018

March 29, 2017

Click for automatic bibliography generation  

jfe Steel Corporation

C22C38/00; C21D8/12; C22C38/06; C23C10/08; H01F1/147

JP2012251191A
JP2012158773A
JP2000204477A
JP2011119298A

Shigeru Inoue
Kazuhiro Mori

Previous Patent: Interference detecting device

Next Patent: ON-LINE MICROORGANISM AUTOMATICALLY DETECTING DEVICE