Thyssenkrupp Steel Europe Ag

Outokumpu Nirosta Gmbh

Markus Daamen

Harald Hofmann

Christian Höckling

Matthias Schirmer

Dorothée Dorner

Wilfried Klos

Johann Wilhelm Schmitz

Gerhard Gräf

A method is provided for producing a 0.8-4.5 mm thick steel strip with an amorphous, partially amorphous or fine-crystalline microstructure with grain sizes in the range of 10-10000 nm and also a flat steel product made therefrom. A molten steel is cast into a cast strip in a casting device and cooled down at an accelerated rate. Along with Fe and impurities that are unavoidable for production-related reasons, the molten material contains at least two elements belonging to the group 'Si, B, C and P'. In this case, the following applies for the contents of these elements (in % by weight) Si: 1.2-7.0%, B: 0.4-4.0%, C: 0.5-4.0%, P: 1.5-8.0%. With a corresponding composition and a microstructure with corresponding characteristics, a flat steel product according to the invention has a HV0.5 hardness of 760-900.

Method for producing a flat steel product with an amorphous, partially amorphous or fine-crystalline microstructure and flat steel product with such characteristics

A method for producing a cast strip of molten metal, in which the molten metal passes through a casting gap defined by two oppositely rotating casting rollers and is shaped into the cast strip, as well as the cast strip that is produced. By providing the cast strip in the casting gap with a different thickness in a first length section extending in the longitudinal direction of the cast strip than in a second length section bordering thereon, a metal strip is produced that has length sections with different thicknesses.

Method for producing a cast strip of molten metal and cast strip

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Aachen, Germany

Markus Daamen