Process of making electrical steels having good cleanliness...

Details Process of making electrical steels having good cleanliness... Process of making electrical steels having good cleanliness...

H - Electricity

01

F

H01F 41/02 (2006.01) C21D 8/12 (2006.01) C22C 38/00 (2006.01) C22C 38/60 (2006.01)

Patent

CA 2262144

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 °F and, preferably, less than 1000 °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.

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