Process for the production of grain-oriented electric quality sheet with low remagnetization loss and high polarization

US6524400B1 · kind B1 · utility

Assignee

• THYSSEN KRUPP STAHL AG · DE

Inventors

• Hans Pircher · Oberndorf bei Salzburg, AT
• Rudolf Kawalla · Bottrop, DE
• Manfred Espenhahn · Essen, DE
• Andreas Böttcher · Mettmann, DE
• Klaus Gunther · Voerde, DE
• Hans Huneus · Herne, DE
• Carl-Dieter Wuppermann · Krefeld, DE

Key dates

• Filing date: Jun 6, 2000
• Grant date: Feb 25, 2003
• Expiry date: Jun 6, 2020

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02P10/20
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A process for the production of grain-oriented electric quality sheet by melting a silicon steel and casting the melt continuously into a strand having a thickness of 25-100 mm. During solidification the strand is cooled to a temperature above 700° C. and divided into thin slabs. The thin slabs then pass through an equalization furnace standing in line where they are reheated to a temperature ≦1170° C. and continuously rolled in a multi-stand hot rolling mill to give hot strip having a thickness of ≦3.0 mm. The first shaping pass is performed at a temperature in the rolling stock up to 1150° C. The reduction in thickness is at least 20%. The hot strip is cold rolled in one or more stages with recrystallizing intermediate annealing to a final thickness in the range of 0.15-0.50 mm. The cold strip is then annealed with recrystallization and decarburization, furnished with a predominantly MgO-containing annealing separator and given a final annealing for imprinting a Goss texture. The strip is then coated with an electric insulation and given a stress-free annealing.