Thyssenkrupp Stahl Ag

Thyssenkrupp Steel Ag

Thyssenkrupp Rasselstein Gmbh

Thyssenkrupp Electrical Steel Ebg Gmbh

Rasselstein Gmbh

Karl Ernst Friedrich

Carl-Dieter Wuppermann

Rudolf Kawalla

Brigitte Hammer

Olaf Fischer

J&uuml;rgen Schneider

Hans Pircher

Reiner Sauer

Burkhard Kaup

Karl Telger

Helmut Oberhoffer

Dirk Matusch

Thomas B&ouml;hm

Wolfgang Rasim

Joergen Schneider

Jürgen Schneider

Bernd Baumann

Josef Kesselem

Andrea Link

Harald Baulig

The invention relates to the use of a steel sheet provided with a protective layer for producing a ring-pull top or a can having a ring-pull top, where the steel sheet is made of an unalloyed or low-alloy steel having a carbon content of less than 0.1% by weight, and also an associated process. The problem proceeding from known steel sheets having a protective layer, namely to provide a steel sheet by means of which ring-pull tops which for a constant residual wall thickness of the notch line have a lower tear-off force can be produced by means of the ring-pull top, is solved by the steel sheet being recrystallizingly heat treated at a heating rate of more than 75 K/s and after the recrystallizing heat treatment cooled at a cooling rate of at least 100 K/s and then coated with the protective layer.

Method for producing a ring-pull top from a steel sheet provided with a protective layer and a ring-pull top produced thereby

The present invention relates to a hot-rolled steel strip for further processing to form non-grain oriented electrical sheet with the following composition (in % by weight) C: &#x3c;0.02%, Mn: &#x2266;1.2%, Si: 0.1-4.4%, Al 0.1-4.4%, wherein the sum formed from the Si content and twice the Al content is &#x3c;5%, P: &#x3c;0.15%, Sn: &#x2266;0.20%, Sb: &#x2266;0.20%, the remainder iron and unavoidable impurities, with a strip thickness which is at most 1.8 mm, and with a partially softened structure which is characterised by a high intensity for the &#x3b1; fibre (fibre representation of orientation distribution functions) in the region of 0&#xb0; to 60&#xb0;, wherein the ratio I/Iformed from the intensity Iof the position (112) &#x3c;110&#x3e; to the intensity Iof the position (001) &#x3c;110&#x3e; is &#x3e;0.4 and the ratio I/Iformed from the intensity Iof the position (111) &#x3c;110&#x3e; to the intensity Iof the position (001) &#x3c;110&#x3e; is &#x3e;0.2.

Hot-rolled strip intended for the production of non-grain oriented electrical sheet and a method for the production thereof

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

Method of producing non-grain-oriented electrical sheet

Growing community of inventors

Moers, Germany

Karl Ernst Friedrich