Title:
METHOD FOR PRODUCING GRAIN-ORIENTED ELECTROMAGNETIC STEEL SHEET, AND INDUCTION HEATER
Document Type and Number:
WIPO Patent Application WO/2024/053628
Kind Code:
A1
Abstract:
A method for producing a grain-oriented electromagnetic steel sheet, the method comprising: hot-rolling a steel material to obtain a hot-rolled sheet; subjecting the hot-rolled sheet to cold rolling once or subjecting the hot-rolled sheet to cold rolling two or more times and to process annealing interposed therebetween, thereby obtaining a cold-rolled sheet having a final sheet thickness; and subjecting the cold-rolled sheet to decarburization annealing serving also as primary recrystallization annealing and then to finish annealing. The decarburization annealing is conducted such that in the course of temperature rising, the cold-rolled sheet is rapidly heated from 400°C to a temperature T (°C) between 700°C and 900°C at an average heating rate of 250 °C/s or higher and that a time period of 0.10 s or longer but shorter than 1.00 s is set during which the heating rate for any temperatures between 500°C and 700°C is not higher than 2/3 the average heating rate. Thus, a grain-oriented electromagnetic steel sheet having excellent magnetic properties is produced. The rapid heating in the decarburization annealing is conducted using a transverse-type induction heater.
Inventors:
SHIMOYAMA YUSUKE (JP)
SHINGAKI YUKIHIRO (JP)
TERASHIMA TAKASHI (JP)
SHINGAKI YUKIHIRO (JP)
TERASHIMA TAKASHI (JP)
Application Number:
PCT/JP2023/032314
Publication Date:
March 14, 2024
Filing Date:
September 05, 2023
Export Citation:
Assignee:
JFE STEEL CORP (JP)
International Classes:
C21D8/12; C22C38/00; C22C38/60; H01F1/147; H05B6/10; H05B6/36
Domestic Patent References:
| WO2020145319A1 | 2020-07-16 |
Foreign References:
| JP2020084303A | 2020-06-04 | |||
| JP2014152393A | 2014-08-25 | |||
| JP2010280970A | 2010-12-16 | |||
| JPH01290716A | 1989-11-22 | |||
| KR20140131496A | 2014-11-13 |
Attorney, Agent or Firm:
GINZA MARONIE P.C. (JP)
Download PDF: