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AssigneeThyssenKrupp Stahl AG
InventorsKarl Ernst Friedrich, Brigitte Hammer, Rudolf Kawalla, Olaf Fischer, J?uuml;rgen Schneider, Carl-Dieter Wuppermann
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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: ≦1.5 %; Al: ≦0.5 %, wherein [% Si]+2[% Al]≦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 Ar1 temperature, a hot strip with a thickness ≦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 εH 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.
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 %)
The method according to one of the preceding claims, characterised in that the hot strip is coiled.
The method according to one of the preceding claims, characterised in that total deformation εH achieved during rolling in the mixed region austenite/ferrite, is 10%-15%.
The method according to one of the preceding claims, characterised in that the hot strip is pickled following coiling.
The method according to one of the preceding claims, characterised in that the hot strip is annealed at an annealing temperature of at least 740° C. to obtain a finally annealed magnetic steel strip.
The method according to one of the preceding claims, characterised in that the hot strip is finished and shipped without having been cold-rolled.
The method according to one of the preceding claims, characterised in that the final thickness of the hot strip is 0.65 to 1 mm.
The method according to one of the preceding claims, characterised in that hot rolling in the mixed region is accompanied by lubrication.
The method according to one of the preceding claims, characterised in that the Si content of the steel is max. 1% by weight.
Dependencies are inferred from the claim text.