THIN ALLOY SHEET OF LOW THERMAL EXPANSION AND SHADOW MASK USING THE SAME

摘要

A thin alloy sheet having a low thermal expansion which has a substantial chemical composition in mass %: Ni: 35.0 to 37.0 %, Mn: 0.01 to 0.09 %, Si: 0.01 to 0.04 %, Al: 0.01 to 0.04 % and balance: Fe, with the proviso that Mn/S is 20 to 300 and Mn + Si + Al ≤ 0.15 %, and has an average thermal expansion coefficient in the range of 20 to 100˚C of 1.0 X 10−6/K or less. The thin alloy sheet is free from the occurrence of a crack, a fracture or a flaw and exhibits good etching characteristics and dimensional precision in the manufacture of a shadow mask.