Patent ID: 6508893
Filing Date: 2003-01-21
Classification: B21B,C21D

Abstract:
A method of manufacturing an Feâ€”Ni alloy consisting of 33-37% Ni; 0.001-0.1% Mn; optionally, 0.01-2% Co; and at least one of 1) 0.01-0.8% Nb; 2) 0.01-0.8% Ta; and/or 3) 0.01-0.8% Hf; with the total of Nb, Ta, and Hf being in the range of 0.01-0.8%, and the remainder being Fe and unavoidable impurities, said method comprising subjecting said alloy to a hot rolling process wherein the rate of distortion during each pass of hot rolling is below 70/second resulting in the alloy having a reduced rate of crack formation during such hot rolling process and high drop shock resistance and low thermal expansion after said hot rolling process.