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.

Abstract: A method of making electrical steel strip characterized by low core loss, high permeability and good cleanliness includes producing a slab having a composition consisting essentially of (% by weight): up to 0.02 C, 0.20-1.35 Si, 0.10-0.45 Al, 0.10-1.0 Mn, up to 0.015 S, up to 0.006 N, up to 0.07 Sb, up to 0.12 Sn, and the balance being substantially iron. The slab is hot rolled into a strip with a finishing temperature in the ferrite region. The strip is coiled at a temperature less than 1200.degree. F. and, preferably, less than 1000.degree. F. The strip which has not been subjected to an annealing operation after the coiling is subjected to cold rolling. The strip is then batch annealed and temper rolled.

Abstract: Batch annealed, semi-processed and fully processed motor lamination steels are made by processes which subject a slab having an ultra low carbon composition (less than 0.01%) to at least the following steps: hot rolling with an austenite finishing temperature, coiling at a temperature ranging from 1300.degree.-1450.degree. F., and light temper rolling (less than 1.0% reduction) or leveling; reheating at a temperature less than 2300.degree. F., hot rolling with a ferrite finishing temperature, coiling at a temperature less than 1200.degree. F., and light temper rolling or leveling; or hot rolling with a ferrite finishing temperature, coiling at a temperature ranging from 1100.degree.-1350.degree. F. without a subsequent hot band anneal, and light temper rolling or leveling.

Abstract: Batch annealed, semi-processed and fully processed motor lamination steels are made by processes which subject a slab having an ultra low carbon composition (less than 0.01%) to at least the following steps: hot rolling with an austenite finishing temperature, coiling at a temperature ranging from 1300.degree.-1450.degree. F., and light temper rolling (less than 1.0% reduction) or leveling; reheating at a temperature less than 2300.degree. F., hot rolling with a ferrite finishing temperature, coiling at a temperature less than 1200.degree. F., and light temper rolling or leveling; or hot rolling with a ferrite finishing temperature, coiling at a temperature ranging from 1100.degree.-1350.degree. F. without a subsequent hot band anneal, and light temper rolling or leveling.