Method for producing non-grain oriented electric sheet steel

US6773514B1 · kind B1 · utility

Assignee

• THYSSEN KRUPP STAHL AG · DE

Inventors

• Rudolf Kawalla · Bottrop, DE
• Hans Pircher · Oberndorf bei Salzburg, AT
• Karl Ernst Friedrich · Moers, DE
• Brigitte Hammer · Voerde, DE
• Jürgen Schneider · Kirchzarten, DE
• Olaf Fischer · Bochum, DE
• Carl-Dieter Wuppermann · Krefeld, DE

Key dates

• Filing date: Jun 6, 2002
• Grant date: Aug 10, 2004
• Expiry date: Jun 6, 2022

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C21D8/1272
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

The present invention relates to a method for producing non grain-oriented magnetic steel sheets in which hot strip is produced from an input stock such as cast slabs, strip, roughed strip, or thin slabs, made of steel comprising (in weight %) C: 0.001-0.05%; Si: ≦1.5%; Al: ≦0.4% with Si+2Al≦1.7%; Mn: 0.1-1.2%; if necessary up to a total of 1.5% of alloying additions such as P, Sn, Sb, Zr, V, Ti, N, Ni, Co, Nb and/or B; with the remainder being iron as well as the usual accompanying elements; in that the input stock is hot-rolled directly from the casting heat or after preceding reheating to a reheating temperature between min. 1000° C. and max. 1180° C. in several deformation passes, and subsequently coiled, wherein during hot-rolling at least the first deformation pass takes place in the austenitic region and at least one further deformation pass takes place in the two-phase mixing region austenite/ferrite, and wherein during rolling in the two-phase mixing region a total deformation &egr;h of at least 35% is achieved.