Method for producing a metal strip from an iron-nickel alloy for tensioned shadow masks
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United States of America Patent
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Issued Date -
Mar 31, 2005
app pub date -
Mar 17, 2004
filing date -
Sep 19, 2001
priority date (Note) -
Abandoned
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Abstract
A method for producing iron-nickel alloy strip for tensioned shadow masks for use in flat monitors and screens, includes the steps of forming an alloy having a composition, in mass %, of 35-38% Ni, 0.4-0.8% Mo, 0.1-0.3% Cr, 0.08-0.12% C, up to 1% Mn, up to 1% Si, up to 1% Nb, with the balance to total 100% being Fe and impurities; cold rolling the alloy composition to a predetermined final thickness to form a strip; and annealing the cold-rolled strip at predetermined temperatures over a range wherein a coercive field strength (H.sub.c) of the alloy strip first decreases to a minimum value and then remains substantially constant as annealing temperature is increased; such that the annealed strip has a coercive field strength<100 A/m and a creep strain<0.1% at conditions of 460.degree. C., and a load of 138 mPa, for 1 hour.
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