Thyssenkrupp Stahl Ag

Jfe Steel Corporation

Thyssenkrupp Steel Europe Ag

Thyssenkrupp Steel Ag

Ebg Gesellschaft Fur Elektromagnetische Werkstoffe Mbh

Thyssen Krupp Ag

Brigitte Hammer

Rudolf Kawalla

Thomas Heller

Carl-Dieter Wuppermann

Olaf Fischer

Karl Ernst Friedrich

J&uuml;rgen Schneider

Akio Kobayashi

Hans Pircher

Günter Stich

Rolf Bode

Frank Hisker

Hiroshi Matsuda

Takeshi Yokota

Shinjiro Kaneko

Yasushi Tanaka

Yasunobu Nagataki

Kohei Hasegawa

Kazuhiro Seto

Yoshihiro Hosoya

Shusaku Takagi

Kenji Kawamura

Janko Banik

Taro Kizu

Manfred Espenhahn

Harald Hofmann

Fusae Shiimori

Richard Georg Thiessen

Jian Bian

Dorothea Mattissen

Fritz Bolling

Heiner Schrapers

Sebastian Stille

Ekaterina Bocharova

Brigitte Bode, Legal Representative

Thomas Dolle

Klaus Gehnen

Grzegorz Korpala

Klaus Peters

Jonas Schwabe

Jürgen Schneider

Almir Dzafic

Georg Parma

Guenter Stich

Rudolf ProfDr-Ing Kawalla

Jörg Dipl-Ing Mertens

Günther Dipl-Ing Stich

Silke Strauss

A method for producing a cold-rolled steel strip with a yield ratio Re/Rm of at least 0.7, the cold-rolled steel product including iron, unavoidable impurities and (in wt. %) C: 0.05-0.20%, Si: 0.25-1.00%, Mn: 1.0-3.0%, Al: 0.02-1.5%, Cr: 0.1-1.5%, N: &#x3c;0.02%, P: &#x3c;0.03%, S: &#x3c;0.05% and optionally one or more of Ti, Mo, Nb, V, and B, Ti: up to 0.15%, Mo: &#x3c;2%, Nb: &#x3c;0.1%, V: &#x3c;0.12%, and B: 0.0005-0.003%. The cold-rolled flat steel product undergoes heat treatment for 4.5-24 hours at a temperature of 150-400&#xb0; C. Also, a cold rolled flat steel product discussed above having a structure including at least two phases, selected from (in vol. %) at least 10% tempered martensite, &#x3c;10% bainite, &#x3c;10% residual austenite and remainder ferrite, a yield ratio of at least 0.7, a tensile strength of &#x2265;750 MPa and a hole expansion of at least 18%.

Method for producing a cold-rolled flat steel product with high yield strength and flat cold-rolled steel product

A complexly formed steel component may have a tensile strength Rm of greater than 1200 MPa and an elongation at break A50 of greater than 6%. Example methods for producing such components comprise providing a flat steel product, which in addition to iron and unavoidable impurities, contains in percent by weight 0.10-0.60% C, 0.4-2.5% Si, up to 3.0% Al, 0.4-3.0% Mn, up to 1% Ni, up to 2.0% Cu, up to 0.4% Mo, up to 2% Cr, up to 1.5% Co, up to 0.2% Ti, up to 0.2% Nb, and up to 0.5% V. At least 10% by volume of a microstructure of the flat steel product may consist of residual austenite comprising globular residual austenite islands with a grain size of at least 1 &#x3bc;m. Before being cooled, the flat steel product may be heated to a forming temperature of 150-400&#xb0; C. and formed into a component with a degree of forming that is at most equal to uniform elongation Ag.

Method for producing a steel component

A high strength steel, including about 0.05 to about 0.25% of C, less than about 0.5% of Si, about 0.5 to about 3.0% of Mn, not more than about 0.06% of P, not more than about 0.01% of S, about 0.50 to about 3.0% of Sol. Al, not more than about 0.02% of N, about 0.1 to about 0.8% of Mo, about 0.02 to about 0.40% of Ti, and the balance of iron and unavoidable impurities, wherein the steel has a structure formed of at least three phases including a bainite phase, and a retained austenite phase in addition to a ferrite phase having a composite carbide containing Ti and Mo dispersed and precipitated therein, wherein the total volume of the ferrite phase and the bainite phase is not smaller than 80%, the volume of the bainite phase is about 5% to about 60%, and the volume of the retained austenite phase is about 3 to about 20%.

High strength steel excellent in uniform elongation properties and method of manufacturing the same

A high strength steel sheet and a method for manufacturing the same has superior phosphatability properties and hot-dip galvannealed properties besides a tensile strength of 950 MPa or more and a high ductility, and also having a small variation in mechanical properties with the change in annealing conditions.

High strength steel sheet having superior ductility

The invention relates to non-grain oriented magnetic steel sheets which can be produced as final annealed and as a non-final annealed types in such a way that they have improved magnetic polarisation and reduced magnetic reversal losses compared with the previously achieved values. This is achieved in that a suitably composed steel, during its cooling starting from a maximum initial temperature of 1,300&#xb0; C., passes through a temperature range with substantially complete exclusion of a purely austenitic structure (&#x3b3; phase), in which range it comprises an austenite/ferrite dual phase multi-structure (&#x3b1;, &#x3b3; multi-phases), so the magnetic steel sheet, after hot rolling, etching, cold rolling and annealing of the hot strip obtained after hot rolling, has a magnetic polarisation J&#x2267;1.74 T, measured in the longitudinal direction of the strip or sheet and at a magnetic field strength of 2,500 A/m and a value P(50) of the magnetic losses of &#x3c;4.5 W/kg, measured in the longitudinal direction of the strip at J=1.5 T and a frequency f=50 Hz.

Non-grain oriented magnetic steel strip or magnetic steel sheet and method for its production

The present invention relates to a method for producing non grain-oriented magnetic steel sheets in which hot strip is produced from an input stock such as cast slabs, strip, roughed strip, or thin slabs, made of steel comprising (in weight %) C: 0.001-0.05%; Si: &lE;1.5%; Al: &lE;0.4% with Si&plus;2Al&lE;1.7%; 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 as well as the usual accompanying elements; in that the input stock is hot-rolled directly from the casting heat or after preceding reheating to a reheating temperature between min. 1000&deg; C. and max. 1180&deg; C. in several deformation passes, and subsequently coiled, wherein during hot-rolling at least the first deformation pass takes place in the austenitic region and at least one further deformation pass takes place in the two-phase mixing region austenite/ferrite, and wherein during rolling in the two-phase mixing region a total deformation &egr; of at least 35% is achieved.

Method for producing non-grain oriented electric sheet steel

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 &lsqb;% Si&rsqb;&plus;2&lsqb;% Al&rsqb;&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 Ar 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; 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.

Method for producing non-grain-oriented magnetic steel sheet

The invention relates to a method to produce non-grain-oriented magnetic steel sheet made of thin-slab or slab casting with low specific total loss and high polarisation and favourable mechanical properties. It is a characteristic of the invention that the steel slabs are hot rolled either directly from the casting heat or after a reheating to T&gE;900 &deg; C. and two or more metal forming passes are performed in the two-phase region austenite/ferrite in the course of finishing rolling.

Method for producing non-grain oriented magnetic sheet steel

Method for producing electric sheets with a glass coating

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Voerde, Germany

Brigitte Hammer