NON-ORIENTED ELECTROMAGNETIC STEEL SHEET

WIPO Patent Application WO/2023/132197

A1

The present invention achieves both a reduction in iron loss and an increase in magnetic flux density of an Si-gradient magnetic material. The present invention is a multi-layered electromagnetic steel sheet having a laminated structure formed from an inner layer part and surface layer parts positioned on both sides of the inner layer part. The surface layer parts and the inner layer part have a predetermined component composition, wherein: ∆Si, which is defined as a difference ([Si]1 - [Si]0) between Si content [Si]1 in the surface layer parts and Si content [Si]0 in the inner layer part, is 0.5 to 3.3 mass%; the ratio (t1/t) of total thickness t1 of the surface layer parts to sheet thickness t of the electromagnetic steel sheet is 0.08 to 0.73; the ratio (B50/Bs) of saturation magnetization Bs to magnetic flux density B50 at magnetic field intensity of 5,000 A/m is 0.825 or higher; and iron loss W10/10k and the sheet thickness t satisfy the expression of W10/10k ≤ 25 + 6,900 x t at frequency of 10 kHz and maximum magnetic flux density of 1.0 T.

ZAIZEN YOSHIAKI (JP)
MIYAMOTO YUKINO (JP)
ODA YOSHIHIKO (JP)
OKUBO TOMOYUKI (JP)
YOSHIZAKI SOUICHIRO (JP)

PCT/JP2022/046096

July 13, 2023

December 14, 2022

Click for automatic bibliography generation  

JFE STEEL CORP (JP)

C21D8/12; C22C38/00; C22C38/60; H01F1/147

WO2019117095A1	2019-06-20
WO2021065555A1	2021-04-08

JP2010132938A	2010-06-17
JP2020190026A	2020-11-26
KR20210080726A	2021-07-01

SUGIMURA Kenji (JP)

View/Download PDF      PDF Help

Previous Patent: ANGULAR BALL BEARING CAGE AND ANGULAR BALL BEARING

Next Patent: NON-ORIENTED ELECTROMAGNETIC STEEL SHEET