Abstract: The invention relates to a process for the coating of electric steel strips with an oxide powder as annealing separator by the application of an aqueous solution which contains mainly MgO and also at least one additive, including a chlorine-containing compound. The characterizing feature of the invention is that the additive added to the aqueous solution is ammonium chloride (NH4Cl or NH4Cl.nH2O).
Type:
Grant
Filed:
June 6, 2000
Date of Patent:
July 23, 2002
Assignee:
EBG Gesellschaft für Elektromagnetische Werkstoffe
mbH
Abstract: The invention comprises a method for producing electric sheets, in particular grain-oriented electric sheets, with an evenly well-adhering glass film and with improved magnetic properties, in which the hot rolled strip which is produced at first and is optionally annealed is cold-rolled up to an end thickness in one or several steps, thereafter an annealing separator is applied to the strip which is rolled up to the end thickness, and is dried, and therafter the cold strip thus coated is subjected to high-temperature annealing, with an important component of the annealing separator being a hydrous magnesium oxide (MgO) dispersion and the annealing separator being additionally provided with at least one additive. The characterizing feature of the invention is that a finely dispersed water-soluble sodium phosphate compound is used as at least one additive.
Type:
Grant
Filed:
October 3, 1996
Date of Patent:
January 26, 1999
Assignee:
EBG Gesellschaft fur Elektromagnetische Werkstoffe mbH
Inventors:
Fritz Bolling, Brigitte Hammer, Thomas Dolle, Klaus Gehnen, Heiner Schrapers
Abstract: The invention relates to a non-oriented electrical strip having high proportions of cube or cube on face texture, a polarization of J 2500>1.7 T and a low core loss, and also to a process for its production. A steel slab, containing max. 0.025% C, less than 0.1% Mn, 0 to 0.15% boundary-surface-active elements and Si and Al in such a way that the relations (% Si)+2(% Al)>1.6% and (% Si)+(% Al)<4.5% are met, balance iron, is hot rolled to a thickness not lower than 3.5 mm. The resulting hot rolled strip is then cold rolled with a degree of reduction of at least 86% without intermediate recrystallization annealing and, if necessary, final annealed.
Type:
Grant
Filed:
December 4, 1990
Date of Patent:
November 2, 1993
Assignee:
EBG Gesellschaft fur Elektromagnetische Werkstoffe
Inventors:
Rolf Burger, Gert Lehmann, Wolfgang Lindner, Harry Wich, Jochen Wieting