Inventors:
Frank A. Malagari - Freeport PA
Assignee:
Allegheny Ludlum Industries, Inc. - Pittsburgh PA
International Classification:
H01F 104
Abstract:
A hot rolled band suitable for processing into cube-on-edge oriented silicon steel having a permeability of at least 1870 (G/O. sub. e) at 10 oersteds and a core loss of no more than 0. 700 watts per pound at 17 kilogauss; and processing for the steel from which the band is made. The hot rolled band has a thickness of from about 0. 050 to about 0. 120 inch; and consists essentially of, by weight, 0. 02 to 0. 06% carbon, 0. 015 to 0. 15% manganese, 0. 01 to 0. 05% of material from the group consisting of sulfur and selenium; 0. 0006 to 0. 0080% boron, up to 0. 0100% nitrogen, 2. 5 to 4. 0% silicon, between 0. 3 and 1. 0% copper, no more than 0. 008% aluminum, balance iron. Processing includes the steps of cold rolling the steel band to a thickness no greater than 0. 020 inch without an intermediate anneal between cold rolling passes; preparing several coils from the steel; decarburizing the steel and final texture annealing the steel. Essential to the invention is the inclusion of a controlled amount of copper in the melt.