Abstract: The invention relates to a grain-oriented magnetic steel sheet including an electrically insulating coating made of an amorphous carbon-hydrogen network, which is applied after final annealing in order to ensure electrical insulation of the individual layers of the sheet. The grain-oriented magnetic steel sheet including the electrically insulating coating made of an amorphous carbon-hydrogen network can be used in transformers.
Type:
Grant
Filed:
June 21, 2002
Date of Patent:
January 30, 2007
Assignee:
ThyssenKrupp Electrical Steel EBG GmbH
Inventors:
Bernd Schuhmacher, Klaus Guenther, Hermann Hingmann, Klaus Bewilogua, Claus-Peter Klages, Heinz Dimigen, Thomas Jung
Abstract: Method for producing non-grain-oriented electric sheet comprising:
introducing steel input stock as a heated and prerolled slab into finishing rolls at a temperature of ≦1100° C. wherein the reheating temperature (TBR) corresponds to a reheating target temperature (TZBR) determined by the formula:
TZBR(° C.)=1195° C.+12.716*(GSi+GAl)
wherein
TZBR(° C.)=target temperature of the reheated slab
GSi=Si content in weight %
GAl=Al content in weight %
hot rolling to a thickness<3.5 mm at a final rolling temperature (TET)≧770° C.
coiling at a temperature (THT) wherein
THT(° C.)=154−1.8&agr;t+0.577 TET+111d/d0
wherein
d0=reference thickness of the strip=3 mm
d=actual thickness of the strip in mm
t=time in seconds between the end of hot rolling and coiling
&agr;=0.7/sec. to 1.3/sec. cooling factor
pickling and cold rolling to a thickness of 0.2-1 mm.
Type:
Grant
Filed:
December 28, 2001
Date of Patent:
June 24, 2003
Assignee:
ThyssenKrupp Electrical Steel EBG GmbH
Inventors:
Thomas Böhm, Jürgen Schneider, Karl Telger, Carl-Dieter Wuppermann, Rudolf Kawalla, Karl Ernst Friedrich