Fe-Co-Ni alloy and use for the manufacture of a shadow mask

摘要

Fe—Ni—Co alloy whose chemical composition contains, by weight: 32%≦Ni≦34%, 3.5%≦Co≦6.5%, 0%≦Mn≦0.1%, 0%≦Si≦0.1%, 0%≦Cr≦0.1%, 0.005%=C≦0.02%, S≦0.001%, 0.0001%≦Ca≦0.002%, 0.0001%≦Mg≦0.002%, the substantial remainder preferably being iron and impurities resulting from smelting; the chemical composition of the alloy furthermore satisfying the relationships: Co+Ni≦38.5%, Co+0.5×Ni≧20%, Co+5×Ni≧165.5% and S≦0.02×Mn+0.8×Ca+0.6×Mg. Use of the alloy for the manufacture of a shadow mask for a display cathode ray tube.