NON-ORIENTED ELECTROMAGNETIC STEEL SHEET AND PRODUCTION METHOD THEREFOR

WIPO Patent Application WO/2018/221126

A1

The present invention improves cold rolling properties without deteriorating magnetic properties or degrading productivity by: conducting hot rolling of a steel slab that contains, by mass%, at most 0.0050% of C, 3.2-4.5% of Si, 0.1-2.0% of Mn, at most 0.020% of P, at most 0.0030% of As, 0.005-0.10% of Sn+Sb, and a total of 0.0020-0.10% of one or two elements selected from Mo and W; conducting or not conducting hot-rolled sheet annealing; conducting cold rolling once or at least twice with intermediate annealing interposed therebetween so as to obtain a final sheet thickness; and thereafter conducting finish annealing to obtain a non-oriented electromagnetic steel sheet, wherein the N2 content in an atmosphere of the finish annealing is at most 20 vol%, and, preferably, the draft in a first pass in a rough rolling of the hot rolling is at most 25% and the average strain rate is at most 4 /s.

OKUBO TOMOYUKI (JP)
ZAIZEN YOSHIAKI (JP)
UESAKA MASANORI (JP)
ODA YOSHIHIKO (JP)

PCT/JP2018/017716

December 06, 2018

May 08, 2018

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JFE STEEL CORP (JP)

C22C38/00; C21D8/12; C22C38/60; H01F1/147

WO2014129106A1	2014-08-28
WO2014142149A1	2014-09-18
WO2013046661A1	2013-04-04
WO2016002904A1	2016-01-07
WO2014030512A1	2014-02-27
WO2013146879A1	2013-10-03

JP2016151063A

2016-08-22

SHIGERU SHIDA, JOURNAL OF THE JAPAN SOCIETY FOR TECHNOLOGY OF PLASTICITY, vol. 7, 1966, pages 424
See also references of EP 3633059A4

GINZA MARONIE P.C. (JP)

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