Title:
METHOD FOR ANNEALING HOT-ROLLED STEEL STRIP
Document Type and Number:
WIPO Patent Application WO/2023/190645
Kind Code:
A1
Abstract:
Provided is a method for annealing a hot-rolled steel strip, the method controlling the annealing temperature with high accuracy to obtain good magnetic properties throughout the length of the steel strip. In a method for annealing a hot-rolled steel strip for an electrical steel sheet containing 1.6 to 5.0 mass% of Si using a continuous annealing facility in which a heating strip, a soaking strip, and a cooling strip are disposed in order from the upstream side, the heating conditions in the annealing facility are determined from either temperature distribution information of a slab in the length direction thereof during slab heating, or temperature distribution information of the steel strip in the length direction thereof during hot rolling. Further, for the heating conditions in the anneal facility, a rapid heating device is disposed on the upstream side of the soaking strip, a sheet thickness meter is disposed on the upstream side of the rapid heating device, and the steel strip heating temperature of the rapid heating device is set in consideration of the value of LSD, which is defined by the thickness (t) of the steel strip measured by the sheet thickness meter and a sheet passing speed (LS) of the steel strip during annealing, so as to achieve a target annealing temperature. Herein, LSD=t×LS.
Inventors:
KOBAYASHI HIROKAZU (JP)
Application Number:
PCT/JP2023/012737
Publication Date:
October 05, 2023
Filing Date:
March 29, 2023
Export Citation:
Assignee:
JFE STEEL CORP (JP)
International Classes:
C21D8/12; C21D9/46; C21D9/52; C21D9/60; C21D9/62; C22C38/00; C22C38/02
Domestic Patent References:
| WO2018074531A1 | 2018-04-26 |
Foreign References:
| JP2003147440A | 2003-05-21 | |||
| JP2018066040A | 2018-04-26 | |||
| JP2011179035A | 2011-09-15 | |||
| JPH09118927A | 1997-05-06 | |||
| US20140175713A1 | 2014-06-26 |
Attorney, Agent or Firm:
GINZA MARONIE P.C. (JP)
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