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Title:
HIGH-STRENGTH NON-ORIENTED ELECTROMAGNETIC STEEL PLATE AND METHOD FOR MANUFACTURING SAME
Document Type and Number:
WIPO Patent Application WO/2024/057940
Kind Code:
A1
Abstract:
When a steel slab containing, in mass%, 0.0050% or less of C, 2.0-5.0% of Si, 0.2-1.8% of Mn, 0.5-2.5% of Al, 0.001-0.100% of Mo, and 0.02-0.10% in total of Sn and Sb, the contents of Si, Al and Mn satisfying a predetermined relationship, is hot-rolled, hot roll-annealed, cold-rolled, and finish annealed to manufacture a non-oriented electromagnetic steel plate, the soaking temperature in the finish annealing is set to 500°C or higher and below a temperature T determined from the contents of Si, Al and Mn, the time to maintain the soaking temperature is set to 60 seconds or less, and the residence time at 500°C or higher is set to 100 seconds or less to yield a tensile strength of 700-950 MPa and a dislocation density at the center of the plate thickness of at least 1.2×1014 m-2, thereby providing a non-oriented electromagnetic steel plate having high strength after finish annealing and having low core loss after strain relief annealing.

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Inventors:
SAITO HAYATO (JP)
TANAKA TAKAAKI (JP)
OKUBO TOMOYUKI (JP)
SUEHIRO RYUICHI (JP)
MARUYAMA SHIGEHIRO (JP)
Application Number:
PCT/JP2023/031709
Publication Date:
March 21, 2024
Filing Date:
August 31, 2023
Export Citation:
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Assignee:
JFE STEEL CORP (JP)
International Classes:
C21D8/12; C21D9/46; C22C38/00; C22C38/60; H01F1/147
Domestic Patent References:
WO2021084785A12021-05-06
WO2021117325A12021-06-17
WO2018221126A12018-12-06
WO2013046661A12013-04-04
WO2014142149A12014-09-18
Foreign References:
JP2017106059A2017-06-15
JP2019504193A2019-02-14
JP2021509447A2021-03-25
Attorney, Agent or Firm:
GINZA MARONIE P.C. (JP)
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