Silicon steel and processing therefore

Details Silicon steel and processing therefore Silicon steel and processing therefore

C - Chemistry, Metallurgy

22

C

75/149, 148/8

C22C 38/24 (2006.01) C21D 1/00 (2006.01) C21D 8/12 (2006.01) C22C 38/02 (2006.01) H01F 1/147 (2006.01)

Patent

CA 1082952

SILICON STEEL AND PROCESSING THEREFORE ABSTRACT OF THE DISCLOSURE A hot rolled band suitable for processing into cube-on-edge oriented silicon steel having a permeability of at least 1870 (G/Oe) 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.

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