Process of making electrical steels
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United States of America Patent
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-
Apr 17, 2001
Grant Date -
N/A
app pub date -
Sep 29, 1997
filing date -
Apr 26, 1994
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Batch annealed, semi-processed and fully processed motor lamination steels are made by processes which subject a slab having a particular ultra low carbon composition (less than 0.01%) to steps which include hot rolling a slab into a strip and coiling the strip. This is followed by the sequential steps of preferably annealing the strip in coil form, cold rolling the strip and batch annealing the strip in coil form. The strip is flattened by a temper rolling or leveling process. The flattening step reduces the thickness of the strip by an amount ranging from greater than 0% to not greater than 1.0% to provide the strip with a permeability when stress relief annealed of at least 2500 Gauss/Oersted.
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