Thyssenkrupp Steel Europe Ag

Thyssenkrupp Electrical Steel Gmbh

Dorothée Dorner

Lothar Patberg

Harald Hofmann

Christian Höckling

Matthias Schirmer

Olaf Fischer

Karl Telger

Andreas Breidenbach

Markus Daamen

Andreas Keutz

Magnus Miller

Jonas Schwabe

Alexander Zimmermann

Florian Herget

Alexander Dipl-Ing Zimmermann

Jonas Dipl-Ing Schwabe

Matthias Dipl-Ing Schirmer

Olaf Dr-Ing Fischer

Andreas Jansen

Harald Dr-Ing Hofmann

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 cold-rolled flat steel product for deep drawing applications is disclosed, composed of a steel which, in addition to Fe and unavoidable impurities (in % by weight) contains C: &#x3c;0.1%, Al: 6.5-11%, REM: 0.02-0.2%, P: &#x3c;0.1%, S: &#x3c;0.03%, N: &#x3c;0.1% and optionally one or more elements from the group of 'Mn, Si, Nb, Ti, Mo, Cr, Zr, V, W, Co, Ni, B, Cu, Ca, N', provided that Mn: &#x3c;6%, Si: &#x3c;1%, Nb: &#x3c;0.3%, Ti: &#x3c;0.3%, Zr: &#x3c;1%, V: &#x3c;1%, V: &#x3c;1%, Mo: &#x3c;1%, Cr: &#x3c;3%, Co: &#x3c;1%, Ni: &#x3c;2%, B: &#x3c;0.1%, Cu: &#x3c;3%, Ca: &#x3c;0.015%. For production of such a flat steel product, a steel of appropriate composition is cast to give a pre-product, which is then hot-rolled to hot strip at a hot rolling end temperature of 820-1000&#xb0; C. The latter is subsequently wound at a winding temperature of up to 850&#xb0; C., after winding annealed at an annealing temperature of &#x3e;650-1200&#xb0; C. for 1-50 h, then cold-rolled in one or more stages with a total cold rolling level of &#x2265;30% to give the cold-rolled flat steel product and finally annealed at 650-850&#xb0; C.

Cold-rolled flat steel product for deep drawing applications and method for production thereof

A non-grain-oriented electrical steel strip or sheet consisting of a steel which contains, in addition to iron and unavoidable impurities, (in wt. %) Si: 1.0-4.5%, Al: up to 2.0%, Mn: up to 1.0%, C: up to 0.01%, N: up to 0.01%, S: up to 0.012%, Ti: 0.1-0.5% P: 0.1-0.3%, wherein 1.0&#x2266;% Ti/% P&#x2266;2.0 applies for the % Ti/% P ratio. The NGO sheet or strip can be manufactured by cold rolling a hot strip of a steel having the previously mentioned composition into a cold strip and subjecting this cold strip to a final annealing process. Different variants of this final annealing process may be used to accentuate the properties of the strip or sheet. The non-grain-oriented electrical steel strip or sheet and components manufactured from such a sheet or strip for electrotechnical applications are characterized by increased strength and good magnetic properties.

Non-grain-oriented electrical steel strip or sheet, component manufactured from it and method for producing a non-grain-oriented electrical steel strip or sheet

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Dusseldorf, Germany

Dorothée Dorner