LOW-THERMAL EXPANSION ALLOY THIN SHEET AND ITS MANUFACTURING METHOD

摘要

A low-thermal expansion alloy thin sheet wherein the sheet substantially comprises 35 to 37 mass% of Ni, 0.02 mass% or less of C, 0.3 mass% or less of Si, 0.6 mass% or less of Mn, 0.01 mass% or less of P, 0.005 mass% or less of S, 0.01 mass% or less of N, 0.1 mass% or less of Al, 0.08 mass% or less of Cr, 0.05 to 1 mass% of Nb, 0.01 to 1 mass% of V, and the balance of Fe, and (Nb+V)<=1.0 mass%. The sheet has a sufficiently low coefficient of thermal expansion and excellent shock resistance and magnetic characteristics after it is formed into a shadow mask by softening the sheet below 850°C before the press. Therefore, the sheet is preferable to a shadow mask of a cathode-ray tube.