Thyssen Stahl Ag

Usinor Sacilor

Thyssen Edelstahlwerke Ag

Ugine Sa

Philippe Demarez

Jean-Michel Hauser

Jean-Claude Bavay

Frederic Mazurier

Method for producing a magnetic steel strip having a thickness of less than 5 mm and containing, in composition by weight, more than 2% silicon, less than 0.1% carbon and a suitable amount of secondary recrystallization inhibiting elements, the balance being iron, obtained by a direct casting on one roll or between two rolls, characterized in that it comprises creating a crystallization structure comprising oriented grains {110} &lt;001&gt; in the skin, i.e. on the surface of a quench zone, by the sudden cooling of the steel in contact with the roll or rolls whose surface temperature is lower than 400.degree. C.

Method for producing a magnetic steel strip by direct casting

The method comprises effecting the solidification of the metal in a continuous casting ingot mould constituted by two cooled rolls (2) rotating in opposite directions and disposed in confronting relation so as to define a casting space therebetween, continuously extracting from the ingot mould a solidified steel strip (3), and, below the ingot mould, subjecting the strip to a quenching medium (6) so as to cool it sufficiently rapidly to prevent formation of austenite. This medium may be formed by a quenching bath placed in a container (4) disposed under the rolls (2) and having a bottom provided with an opening (5) for the passage of the solidified strip (3). The quenching medium may also be formed by an inert gas in the liquid state blown onto the product by nozzles. The steel strips obtained are easier to shear and coiled at the output end of the casting line owing to the absence of martensite in the ferritic matrix.

Method and device for manufacturing a semi-ferritic stainless steel

Growing community of inventors

Labeuvriere, France

Philippe Demarez