Title:
METHOD FOR PRODUCING GRAIN-ORIENTED ELECTROMAGNETIC STEEL SHEET, AND INDUCTION HEATER
Document Type and Number:
WIPO Patent Application WO/2024/053627
Kind Code:
A1
Abstract:
A method for producing a grain-oriented electromagnetic steel sheet, the method comprising hot-rolling a steel material having a given composition, cold-rolling the hot-rolled sheet to obtain 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, wherein the cold-rolling includes final cold rolling conducted by at least one pass at a steel sheet temperature in the range of 150-350°C. 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/JP2023/032312
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
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)
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