Metal treatment – Process of modifying or maintaining internal physical... – Magnetic materials
Patent
1976-06-17
1977-06-21
Satterfield, Walter R.
Metal treatment
Process of modifying or maintaining internal physical...
Magnetic materials
148 3155, 148111, 148113, H01F 104
Patent
active
040309509
ABSTRACT:
A process for producing electromagnetic silicon steel having a cube-on-edge orientation and a permeability of at least 1870 (G/O.sub.e) 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.degree. to 2000.degree. F in a hydrogen-bearing atmosphere having a dew point of from +20.degree. to +110.degree. 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 least 320 parts per million of oxygen, based on the total weight of the steel, within 10 microns of the surfaces of said steel.
REFERENCES:
patent: 2455632 (1948-12-01), Williams
patent: 3159511 (1964-12-01), Taguchi et al.
patent: 3345219 (1967-10-01), Detert
patent: 3954521 (1976-05-01), Malagari
Datta Amitava
Malagari, Jr. Frank A.
Shilling Jack W.
Allegheny Ludlum Industries, Inc.
Dropkin Robert F.
Gioia Vincent G.
Satterfield Walter R.
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