Metal treatment – Process of modifying or maintaining internal physical... – Magnetic materials
Patent
1996-05-08
1998-02-10
Sheehan, John
Metal treatment
Process of modifying or maintaining internal physical...
Magnetic materials
148121, H01F 1147
Patent
active
057164606
ABSTRACT:
Methods for preparing magnetic strips are provided in which the strips are manufactured to a thickness of less than about 0.005 inches and are made of a iron-based alloy having a manganese content of from about 8 to about 18 weight percent. The thin strips can be prepared by annealing the alloy, then cold rolling the alloy to reduce its thickness by at least about 40% to produce an initial strip, thermally treating the initial strip between about 400.degree. C. and its austenitizing temperature, cold rolling the initial strip to reduce its thickness by at least 75% to below about 0.005 inches, and thermally treating this strip at a temperature of at least 525.degree. C. for a period of time between about 0.1 and about 3 minutes. The strips are particularly useful in electronic article surveillance systems.
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Anderson Richard L.
Manning Neil R.
Sheehan John
The Arnold Engineering Company
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