Thyssenkrupp Steel Europe Ag

Thyssenkrupp Steel Ag

Thyssen Krupp Ag

Thyssenkrupp Stahl Ag

Max-planck-institut Fur Eisenforschung Gmbh

Harald Hofmann

Janko Banik

Christian Höckling

Jens-Ulrik Becker

Manfred Meurer

Matthias Schirmer

Dorothée Dorner

Thomas Heller

Andreas Kern

Bernd Schuhmacher

David Pieronek

Brigitte Hammer

Bernhard Engl

Hans-Joachim Tschersich

Horst Walter Tamler

Ronny Leuschner

Jian Bian

Slavcho Topalski

Evgeny Balichev

Sebastian Stille

Udo Schriever

Werner Zimmermann

Markus Daamen

Jose Jimenez

Manfred Menne

Michael Gövert

Alexander Zimmermann

Jonas Schwabe

Magnus Miller

Hans Ferkel

Dirk Ponge

Andreas Triebels

Jonas Karl Moritz Schwabe

Annette BÄUMER

Ingo Thomas

Christian Hoeckling

Sinasi Goeklue

Georg Parma

Martin Palm

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 including in addition to Fe and unavoidable impurities (in % by weight) C: 0.008%-0.1%, Al: 6.5%-12%, Nb: 0.1%-0.2%, Ti: 0.15-0.5%, P: &#x3c;0.1%, S: &#x3c;0.03%, N: &#x3c;0.1% and optionally one or more elements from the group of Mn, Si, REM, Mo, Cr, Zr, V, W, Co, Ni, B, Cu, Ca, N, where 2.5&#x2265;% Ti/% Nb&#x2265;1.5. Also a method of producing such a flat steel product including casting a pre-product, which is then hot-rolled into a hot strip with a hot rolling end temperature of 820-1000&#xb0; C. and wound at a winding temperature of up to 750&#xb0; C. After winding, the hot strip is 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;65% and finally annealed at 650-850&#xb0; C.

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

The invention relates to a metal strip which is produced from steel by hot rolling and by cold rolling of the metal strip. The invention also relates to a blank produced from the metal strip, the use of the metal strip, and to a method of producing it. The object of providing metal strip from which components of minimum weight which are adapted to specific loads can be produced with little cost or complication is achieved by metal strip of the generic kind which, after the cold rolling, is of constant thickness and has, section by section, regions whose mechanical properties vary. What 'after the cold rolling' means, for the purposes of the present invention, is that, immediately on completion of the cold rolling, i.e. without any further treatment such as heat treatment, regions whose mechanical properties vary are present in the metal strip.

Metal strip having a constant thickness and varying mechanical properties

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.

A composite material with a ballistic protective effect having a first, outer layer made of a first steel alloy and at least one second layer which is arranged under the first layer and is made of a second steel alloy. The composite material with a ballistic protective effect allows for a reduction in the weight or the wall thicknesses of the composite material in comparison to conventional composite ballistic materials, by utilizing a first steel alloy of the first layer that has the following alloy constituents in percent by weight (% by weight): 0.06%&#x2266;C &#x2266;1.05%, 0.05%&#x2266;Si&#x2266;1.65%, 0.3%&#x2266;Mn&#x2266;2.65%, 0.015%&#x2266;Al&#x2266;1.55%; Cr&#x2266;1.2%, Ti&#x2266;0.13%, Mo&#x2266;0.7%, Nb&#x2266;0.1%, B&#x2266;0.005%, P&#x2266;0.08%, S&#x2266;0.01%, Ni&#x2266;4.0%, and V&#x2266;0.05%, the remainder being Fe and inevitable impurities. The second layer of the composite material having a higher elongation than the first layer.

Composite material with a ballistic protective effect

A method for coating hot-rolled or cold-rolled steel strip containing 6-30 wt %. Mn with a metallic protective layer, includes annealing the steel strip at a temperature of 800-1100&#xb0; C. under an annealing atmosphere containing nitrogen, water and hydrogen and then subjecting the steel strip to hot dip coating. The method provide an economical way of hot dip coating a high manganiferous sheet steel in that, in order to produce a metallic protective layer substantially free from oxidic sub-layers on the steel strip, the % HO/% Hratio of the water content % HO to the hydrogen content % Hin the annealing atmosphere is adjusted as a function of the respective annealing temperature TG as follows: % HO/% H&#x2266;8&#xb7;10&#xb7;T.

Process for coating a hot- or cold- rolled steel strip containing 6&#x2212;30% by weight of MN with a metallic protective layer

Coating steel strips comprising, in % by weight, C: &#x2266;1.6%, Mn: 6-30%, Al: &#x2266;10%, Ni: &#x2266;10%, Cr: &#x2266;10%, Si: &#x2266;8%, Cu: &#x2266;3%, Nb: &#x2266;0.6%, Ti: &#x2266;0.3%, V: &#x2266;0.3%, P: &#x2266;0.1%, B: &#x2266;0.01%, the rest being iron and unavoidable impurities, and a method of forming steel strips are described. Up to now, such steel strips were not adequately coatable, with a metal coating ensuring outstanding corrosion-resistance and good welding properties. This is ensured by applying an aluminium layer to the steel strip before final annealing and applying the metal coating to said aluminium layer after final annealing.

Method for steel strip coating and a steel strip provided with said coating

The invention provides a method which allows reliable production of steel products from a light steel. The steel products according to the invention exhibit isotropic deformation behavior and are ductile at low temperature with high yield strengths. This is achieved according to the invention by a method for producing a steel product, in particular a steel sheet or steel strip, wherein a steel strip or sheet is produced from steel which contains (in % by weight): C: &#x2266;1.00%, Mn: 7.00 to 30.00%, Al: 1.00 to 10.00%, Si: &#x3e;2.50 to 8.00 %, Al+Si: &#x3e;3.50 to 12.00%, B: &#x3c;0.01%, Ni: &#x3c;8.00%, Cu: &#x3c;3.00%, N: &#x3c;0.60%, Nb: &#x3c;0.30%, Ti: &#x3c;0.30%, V: &#x3c;0.30%, P: &#x3c;0.01% and iron and unavoidable impurities as the remainder, from which strip or sheet the finished steel product is subsequently produced by cold forming that takes place at a degree of cold forming of 2 to 25%.

Method for producing a steel product

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Dortmund, Germany

Harald Hofmann