Inventors:
Jerry W. Schoen - Middletown OH
Francesco Gaudino - Butler PA
Assignee:
Armco Inc. - Middletown OH
International Classification:
H01F 104
Abstract:
The present invention produces a regular grain oriented electrical steel using a single cold reduction step having excellent and highly uniform magnetic quality. The method includes the steps of providing an electrical steel band having Mn of 0. 024% or less in excess of that needed to combine with S and/or Se. The band is provided with an anneal at a temperature of from 900. degree. -1125. degree. C. (1650. degree. -2050. degree. F. ) for a time up to 10 minutes and slowly cooled to 480. degree. -650. degree. C. (900. degree. -1200. degree. F. ) followed by rapid cooling to a temperature below 100. degree. C. (212. degree. F. ). The annealed band must have a critical amount of austenite,. gamma. sub. 1150. degree. C. , of 7% or more. The annealed band is cold reduced in a single stage to the desired final thickness.