Title:
POWDER FOR ANNEALING SEPARATORS AND METHOD FOR PRODUCING GRAIN-ORIENTED ELECTROMAGNETIC STEEL SHEET USING SAME
Document Type and Number:
WIPO Patent Application WO/2022/196655
Kind Code:
A1
Abstract:
The present invention proposes an annealing separator which enables a steel sheet to retain a good coil shape after annealing if the steel sheet is wound into a coil shape after being coated with this annealing separator, and subsequently annealed at a high temperature that is higher than 1000°C. A powder for annealing separators to be used in the above-described annealing separator contains from 0.2 mass% to 5.0 mass% of particles which have a particle diameter of more than 45 μm but not more than 75 μm, and which are mainly composed of magnesium oxide, while containing from 0.020 mass% to 0.200 mass% of B, from 0.030 mass% to 1.000 mass% of SO3 and from 0.050 mass% to 1.000 mass% of P2O3; and particles having such a particle diameter contain not less than 0.002 mass% but less than 0.020 mass% of boron (B), less than 0.030 mass% of SO3 and less than 0.050 mass% of P2O3.
Inventors:
TERASHIMA TAKASHI (JP)
SHIROYANAGI KARIN (JP)
SHIROYANAGI KARIN (JP)
Application Number:
PCT/JP2022/011434
Publication Date:
September 22, 2022
Filing Date:
March 14, 2022
Export Citation:
Assignee:
JFE STEEL CORP (JP)
International Classes:
C21D8/12; C21D9/46; C23C22/00; H01F1/147; C22C38/00; C22C38/06
Domestic Patent References:
| WO2017195686A1 | 2017-11-16 | |||
| WO2013051270A1 | 2013-04-11 | |||
| WO2008047999A1 | 2008-04-24 | |||
| WO2013051270A1 | 2013-04-11 |
Foreign References:
| JP2011202224A | 2011-10-13 | |||
| JPS49126536A | 1974-12-04 | |||
| JP2012177148A | 2012-09-13 |
Attorney, Agent or Firm:
SUGIMURA Kenji (JP)
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