Title:
STEEL MATERIAL PROCESSING METHOD AND ELECTROMAGNETIC STEEL SHEET
Document Type and Number:
WIPO Patent Application WO/2023/248922
Kind Code:
A1
Abstract:
The present invention allows an electromagnetic steel sheet having Al appropriately diffused therein to be fabricated at a relatively low cost. Disclosed is a steel material processing method involving subjecting a steel material for the electromagnetic steel sheet to a diffusion process in an oxidizing atmosphere, said steel material having a surface on which an aluminum-containing layer is formed. The steel material preferably contains more than 0.00 mass% and not more than 7.00 mass% of Si, and more than 0.00 mass% and not more than 2.00 mass% of Al. The aluminum-containing layer is preferably in the form of a plating layer having a thickness of 2-30 μm. The composition of the plating layer includes Al and may further include, for example, Fe. The diffusion process is preferably performed under a processing condition for achieving a change gradient such that the Al concentration gradually decreases in the direction from the surface of the steel material toward the inside.
Inventors:
NAKAGAWARA YUJI (JP)
OKADA NORIKAZU (JP)
OKADA NORIKAZU (JP)
Application Number:
PCT/JP2023/022263
Publication Date:
December 28, 2023
Filing Date:
June 15, 2023
Export Citation:
Assignee:
AISIN CORP (JP)
International Classes:
C23C10/28; C21D9/46; C22C21/00; C22C21/02; C22C38/00; C23C2/12; C23C2/28; H01F1/147
Foreign References:
| JPH07138648A | 1995-05-30 | |||
| JP2018509522A | 2018-04-05 | |||
| KR20210080002A | 2021-06-30 | |||
| CN108425069A | 2018-08-21 |
Attorney, Agent or Firm:
SAKAMOTO & PARTNERS (JP)
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