Use of nitrogen-bearing base coatings in the manufacture of high

Details Use of nitrogen-bearing base coatings in the manufacture of high Use of nitrogen-bearing base coatings in the manufacture of high

1976-11-22

1979-10-23

Rutledge, L. Dewayne

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

148 27, 148 3155, 148113, H01F 104

Patent

active

041719948

ABSTRACT:
A process for producing silicon steel having a cube-on-edge orientation and a permeability of at least 1850 (G/O.sub.e) at 10 oersteds, which includes the steps of: preparing a melt of steel consisting essentially of, by weight, up to 0.07% carbon, from 2.6 to 4.0% silicon, from 0.03 to 0.24% manganese, from 0.01 to 0.09% of material from the group consisting of sulfur and selenium, at least one element from the group consisting of aluminum in an amount of from 0.015 to 0.04% and boron in an amount of up to 0.0035%, up to 0.02% nitrogen, up to 0.5% copper, balance iron; casting the steel, hot rolling the steel, cold rolling the steel, decarburizing the steel, coating the steel with a base coating containing a nitrogen-bearing compound from the group consisting of (NH.sub.4).sub.2 SO.sub.4, Fe(NO.sub.3).sub.3, Al(NO.sub.3).sub.3, Mg(NO.sub.3).sub.2 and Zn(NO.sub.3).sub.2, and final texture annealing the steel.

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