Processing for cube-on-edge oriented silicon steel

Details Processing for cube-on-edge oriented silicon steel Processing for cube-on-edge oriented silicon steel

H - Electricity

01

F

148/8, 117/91

H01F 1/04 (2006.01) C21D 8/12 (2006.01) H01F 1/147 (2006.01)

Patent

CA 1087965

ABSTRACT A process for producing electromagnetic silicon steel having a cube-on-edge orientation and a permeability of at least 1870 (G/Oe) at 10 oersteds. The process includes the steps of: preparing a melt of silicon steel containing from 0.02 to 0.06% carbon, from 0.0006 to 0.0080% boron, up to 0.0100% nitrogen, no more than 0.008% aluminum and from 2.5 to 4.0% silicon; casting said steel; hot rolling said steel; cold rolling said steel; normalizing said steel at a temperature of from 1300 to 2000°F in a hydrogen-bearing atmosphere having a dew point of from +20 to +llO°F; applying a refractory oxide base coating to said steel; and final texture annealing said steel. The variables of time, temperature and dew point are monitored during normalizing so as to result in a steel having at leat 320 parts per million of oxygen, based on the total weight of the steel, within 10 microns of the surfaces of said steel.

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