Iron-nickel alloy, used for shadow mask, cryogenic storage and electron canon applications, has low cobalt content and very low coefficient of thermal dilation

摘要

An iron-nickel alloy has the following chemical composition (by wt %): (a) 35 at most Ni at most 37; (b) 0.001 at most C at most 0.05; (c) Mn at most 0.10; (d) Si at most 0.15; (e) Co at most 0.5; (f) S less than 0.002; (g) P less than 0.006; (h) B at most 0.0005; (i) Al+Mo+Cu+Cr at most 0.15; (j) 0.15 at most 2(V+Ti)+Nb+Zr+Ta+Hf at most 0.2; (k) 0.0025 at most N+O at most 0.015; (l) possibly some calcium and/or magnesium with a total content between 0.0001 and 0.005; (m) a balance of iron and inevitable production impurities. An Independent claim is also included for the fabrication of a strip of the above alloy by hot rolling.