Method for producing non-grain-oriented magnetic steel sheet

US6767412B2 · kind B2 · utility

Assignee

• THYSSEN KRUPP STAHL AG · DE

Inventors

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

Key dates

• Filing date: Jan 14, 2003
• Grant date: Jul 27, 2004
• Expiry date: Jan 14, 2023

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C21D8/1233
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

The invention relates to a method for producing non-grain-oriented hot-rolled magnetic steel sheet in which from a raw material such as cast slabs, strip, roughed strip or thin slabs produced from a steel comprising (in weight %) C: 0.0001-0.05%; Si: &lE;1.5%; Al: &lE;0.5%, wherein [% Si]+2[% Al]&lE;1.8; 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 and the usual impurities, in a finishing roll line at temperatures above the Ar1 temperature, a hot strip with a thickness &lE;1.5 mm is rolled, wherein at least the last forming pass of hot rolling is carried out in the mixed region austenite/ferrite and wherein the total deformation &egr;H achieved during rolling in the mixed region austenite/ferrite is <35%. With the method according to the invention, it is possible in particular to economically produce thicker magnetic steel sheet which is not grain-oriented and which has good magnetic properties.