| 摘要 |
PROBLEM TO BE SOLVED: To provide a process for manufacturing a shadow mask made of an iron/nickel alloy. SOLUTION: A foil perforated with holes uniformly distributed holes has a chemical composition (wt.%) comprising, by weight: 35.5%≤Ni≤37%, Co≤0.5%, Cr≤0.1%, Cu≤0.1%, Mo≤0.1%, V≤0.1%, Nb≤0.1%, Mn≤0.1%, 0.03%≤Si≤0.15%, S≤0.001%, 0.0001%≤Ca≤0.002%, 0.0001%≤Mg≤0.002%, Al≤0.005%, O≤0.01%, C≤0.02%, N≤0.005%, P≤0.003%, H≤0.001%, B≤0.001%, the balance being iron and inevitable impurities resulting from preparation. The chemical composition further satisfies the relationships: S≤0.02×Mn+0.8×Ca+0.6×Mg and Cr+Cu+Mo+V+Nb+Si≤0.15%. The foil is subjected to a heat treatment in order to obtain grains whose size, as defined by the ASTM E112-88, 12.4 standard, incorporated herein by reference, is greater than or equal to ASTM 7 and successively the foil is formed in order to give it the shape of a shadow mask. COPYRIGHT: (C)2007,JPO&INPIT
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