| 摘要 |
PURPOSE:To manufacture a low-expansion Fe-Ni-Co alloy with high strength by subjecting an ingot having a specific composition consisting of Ni, Co, Mn, Si, Be, and Fe to plastic working and annealing required times, respectively, and then to aging by means of specific heat treatment. CONSTITUTION:Raw materials consisting of, by weight, 26-32% Ni, 11-16% Co, 0.1-0.8% Mn, <=0.5% Si, 0.05-2.0% Be, and the balance Fe with inevitable impurities are blended and subjected to vacuum melting in an Ar atmosphere so as to be formed into an ingot. Subsequently, plastic working and annealing treatment are applied to the above ingot required times until the desired shape is reached. After the final plastic working, the worked material is subjected to heat treatment at a temp. in the region of 300-700 deg.C, preferably for <= about 5hr to undergo aging. By this method, the high-strength low-expansion Fe-Ni-Co alloy excellent in hardness, tensile strength, and bendability, having high deformation resistance, and showing low coefficient of expansion equal to those of lead frame material, etc., can be obtained. |
