| 摘要 |
PURPOSE: A method for manufacturing Fe-Ni alloys used in press molded flat mask cathode-ray tube (CRT) screens is provided. Specifically, by selecting the type and concentration of specific additional elements in the alloy, and by controlling the conditions under which the hot rolling of the alloy is conducted, it is possible to maintain the low thermal expansion and drop-shock resistant characteristics of Fe-Ni alloys while controlling crack formation during the manufacturing process. CONSTITUTION: The method of manufacturing an improved Fe-Ni alloy consisting of 33-37% Ni; 0.001-0.1% Mn; optionally, 0.01-2% Co; and at least one of 0.01-0.8% Nb; 0.01-0.8% Ta; and/or 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. The method comprises subjecting the 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 the hot rolling process, and high drop-shock resistance and low thermal expansion after the hot rolling process.
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