Title:
FINISH ANNEALING FACILITY FOR ELECTROMAGNETIC STEEL SHEET, FINISH ANNEALING METHOD AND PRODUCTION METHOD FOR ELECTROMAGNETIC STEEL SHEET, AND NON-ORIENTED ELECTROMAGNETIC STEEL SHEET
Document Type and Number:
WIPO Patent Application WO/2023/079922
Kind Code:
A1
Abstract:
Provided is an annealing facility in which a steel sheet that has been cold-rolled is subjected to continuous finish annealing by passing the steel sheet through an annealing furnace having at least a first zone, a second zone and a third zone sequentially. In the annealing facility, the composition of an atmospheric gas and the dew point of the atmospheric gas can be controlled independently in each of the zones in the annealing furnace, the second zone is composed of a heating zone having an atmospheric temperature of 900°C or higher, a soaking zone and a cooling zone, the nitrogen content in the atmospheric gas is adjusted to 30 vol% or less, and the dew point of the atmospheric gas is adjusted to -40°C or lower. An electromagnetic steel sheet, preferably a low-iron-loss non-oriented electromagnetic steel sheet is produced by applying finish annealing using the annealing facility.
Inventors:
KAMBARA HIDETO (JP)
SAKAI KEN (JP)
KITAMURA SHINICHI (JP)
NAKASHIMA TORU (JP)
SAKAI KEN (JP)
KITAMURA SHINICHI (JP)
NAKASHIMA TORU (JP)
Application Number:
PCT/JP2022/038167
Publication Date:
May 11, 2023
Filing Date:
October 13, 2022
Export Citation:
Assignee:
JFE STEEL CORP (JP)
International Classes:
C21D8/12; C21D9/46; C21D9/56; H01F1/147; C22C38/00; C22C38/06; C22C38/60
Domestic Patent References:
| WO2020136993A1 | 2020-07-02 | |||
| WO2020090156A1 | 2020-05-07 |
Foreign References:
| JP2018204052A | 2018-12-27 | |||
| JP2006241563A | 2006-09-14 | |||
| CN103451399A | 2013-12-18 |
Attorney, Agent or Firm:
GINZA MARONIE P.C. (JP)
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