| 主权项 |
1. An α+β titanium alloy cold-rolled and annealed sheet, consisting of, in mass %,
Fe: 0.8% to 1.5%, N: 0.020% or less, and the balance: Ti and impurities, and satisfying Q shown in Formula (1) below=0.34 to 0.55, wherein, when a texture in a sheet plane direction is analyzed, assuming that a non al-to-rolling-plane direction of a cold-rolled and annealed sheet is denoted by ND, a sheet longitudinal direction is denoted by RD, the sheet width direction is denoted by TD, a direction normal to a (0001) plane of an α-phase is taken as a c-axis direction, an angle between the c-axis direction and ND is denoted by θ, an angle between a line of projection of the c-axis direction onto the sheet plane and the sheet width direction (TD) is denoted by φ, a strongest intensity out of (0002)-reflection relative intensities of X-rays caused by crystal grains falling within a range of angle θ of not less than 0 degrees and not more than 30 degrees and angle φ of −180 degrees to 180 degrees is denoted by XND, and a strongest intensity out of (0002)-reflection relative intensities of X-rays caused by crystal grains falling within a range of angle θ of not less than 80 degrees and less than 100 degrees and angle φ of ±10 degrees is denoted by XTD, a ratio XTD/XND is 5.0 or more,
Q=[O]+2.77*[N]+0.1*[Fe] (1) where [Fe], [O], and [N] represent the amounts of the respective elements contained [mass %]. |
