| 摘要 |
PROBLEM TO BE SOLVED: To provide a titanium alloy sheet which has excellent cold workability such as press formability more excellent than that of pure titanium of JIS type 1, and has tensile strength above that of pure titanium of JIS type 1, and to provide a method for producing the same. SOLUTION: The titanium alloy sheet includes, by mass, 0.3 to 1.8% Cu, 0.01 to 0.04% O and≤0.05% Fe, and the balance Ti with impurities of≤0.3% and has the average crystal grain size of≤12μm. Further, the method for producing the titanium alloy sheet is characterized in that final annealing is performed at 480 to 625°C. By adding Cu to titanium so as to finely precipitate precipitated phases with Ti<SB>2</SB>Cu as the maximum phase, and the content of O is properly regulated, and further, by refining crystal grain sizes, while maintaining press formability equal to that of pure titanium of JIS type 1, its tensile strength can be improved. COPYRIGHT: (C)2010,JPO&INPIT |
