Patent ID: 6508892
Filing Date: 2003-01-21
Classification: C21D,C22C,C23F,H01J

Abstract:
A shadow mask blank of Feâ€”Ni alloy which exhibits excellent uniformity of diameter of apertures for the passage of electron beams when the apertures are formed by perforation with etching, consisting of, on the basis of mass percentage (%), from 34 to 38% Ni, from 0.05 to 0.5% Mn, from 4 to 20 ppm (mass proportion) S, and the balance Fe and unavoidable impurities or accompanying elements, provided that C is no more than 0.10%, Si is no more than 0.30%, Al is no more than 0.30%, and P is no more than 0.005%, wherein MnS inclusions from 50 to 1,000 nm in diameter are dispersed at the density of at least 1,500/mm2.