Importance

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Abstract

Disclosed is an Fe--Ni alloy consisting of, by mass, 30 to 50% of Ni (or 27 to 47% Ni and not more than 22% Co), 0.005 to 0.1% of Nb, less than 0.01% of C, 0.002 to 0.02% of N, and the balance of Fe and inevitable impurities, wherein the equation '0.000013.ltoreq.(% Nb).times.(% N).ltoreq.0.002', is fulfilled. In the alloy, preferably, the maximum grain size of compounds primarily containing Nb and nitrogen and other compounds primarily containing Nb and C is less than 0.5 .mu.m, which can be observed at an fractional section of metal structure, and a total number of the compounds is not less than 50,000/mm.sup.2 at an fractional section. An average grain size of the alloy structure is not less than 10 by the crystal grain size number as defined in JIS G0551. The alloy may applied to shadow masks for the Braun tube and lead frames for semiconductor elements.

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