Process of making electrical steels having good cleanliness and

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

1998-03-10

2000-05-30

Yee, Deborah

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

148112, 148113, C21D 812

Patent

active

060687088

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.

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