Method of producing non-grain-oriented electrical sheet

A method for manufacturing a non-grain oriented electric sheet comprising:

• introducing steel input stock as a heated and prerolled slab into a group of finishing roll stands at an entry temperature of ≦1100° C., wherein a reheating temperature (TBR) with a maximal deviation of ±20° C. corresponds to a reheating target temperature (TZBR) determined as follows:
• TZBR[° C.]=1195° C.+12.716*(GSi+2GAl)
• wherein
• TZBR:
• Target temperature of reheated slab
• GSi:
• Si content in weight-%
• GAl:
• Al content in weight-%,
• and wherein the steel input stock contains (in weight-%)
• C:
• ≦0.06%
• Si:
• 0.03-2.5%
• Al:
• ≦0.4%
• Mn:
• 0.05-1.0%
• S:
• ≦0.02%
• balance iron and residual impurities;
• hot-rolling the slab into a hot strip with a thickness of <3.5 mm at a final rolling temperature (TET)≧770° C., wherein TET corresponds to a temperature of the steel input stock exiting the finishing roll stands;
• and
• coiling up the hot strip at a coiling temperature (THT) determined as follows with a maximal deviation of ±10° C.:
• THT[° C.]=154−1.8αt+0.577TET+111d/d0
• wherein
• d0:
• Reference thickness of the hot strip=3 mm
• d:
• Actual thickness of the hot strip in mm
• t:
• Time in seconds between the end of the hot rolling and coiling
• α:
• 0.7 per second to 1.3 per second cooling factor,
• wherein the hot strip is subsequently pickled without being first annealed, and, after pickling, cold-rolled into a cold strip with a thickness of 0.2-1 mm at an overall maximal deformation level of 85%, and wherein the cold strip is subjected to a final treatment.