C - Chemistry – Metallurgy – 21 – D
Patent
C - Chemistry, Metallurgy
21
D
148/8
C21D 8/00 (2006.01) C21D 8/12 (2006.01)
Patent
CA 1120386
1089 PROCESSING FOR CUBE-ON-EDGE ORIENTED SILICON STEEL ABSTRACT OF THE DISCLOSURE 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 to a thickness no greater than 0.020 inch; recrystallizing the cold rolled steel at a temperature between 1300 and 1550°F in a hydrogen-bearing atmosphere having a dew point of from +50 to +150°F; decarburizing sate steel to a carbon level below 0.005%; applying a refractory oxide base coating to said steel; and final texture annealing said steel. The steel is heated to said temperature range of between 1300 and 1550°F at a heating rate of at least 1500°F per minute and held within said temperature range for a period of at least 30 seconds.
306968
Allegheny Ludlum Corporation
George H. Riches And Associates
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