Boron and copper bearing silicon steel and processing therefore

Details Boron and copper bearing silicon steel and processing therefore Boron and copper bearing silicon steel and processing therefore

1976-06-17

1977-10-18

Satterfield, Walter R.

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

148 3155, 148112, 75123L, H01F 104

Patent

active

040544702

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.

REFERENCES:
patent: 3855019 (1974-12-01), Salsgiver et al.
patent: 3873380 (1975-03-01), Malagari
patent: 3905843 (1975-09-01), Fiedler
Kussmann, A. et al; Gekupferter Stahl...fur Transform; in Stahl und Eisen, 50 (June 1930) pp. 1194-1197.

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