Patent ID: 9624566
Date: 2017-04-18
CPC Classifications: C22C,C22F

Claim:
1. An α+β titanium alloy sheet, wherein: (a) a normal direction of a hot-rolled sheet is taken as ND, a hot rolling direction is taken as RD, a hot-rolling width direction is taken as TD, a normal direction of the α-phase (0001) plane is taken as c-axis orientation, an angle formed between the c-axis orientation and the ND is taken as θ, and an angle formed between a plane including the c-axis orientation and the ND, and a plane including the ND and the TD is taken as Φ; (b1) among (0002) relative reflection intensities of X-ray by a crystal grain where θ is 0° or more and 30° or less, and Φ falls in the entire circumference of −180° to 180, a maximum relative reflection intensity is taken as XND; (b2) among (0002) relative reflection intensities of X-ray caused by a crystal grain where θ is 80° or more and less than 100°, and Φ falls in ±10°, the maximum relative reflection intensity is taken as XTD; and (c) XTD/XND is 5.0 or more, wherein the α+β titanium alloy sheet comprises, in mass %, Fe: 0.8 to 1.5% and N: 0.020% or less, and contains O, N and Fe to satisfy the condition that Q, in %, defined by the following formula 1 is 0.34 to 0.55, with the balance being Ti and unavoidable impurities: wherein [O] is a content, in mass %, of O, [N] is a content, in mass %, of N, and [Fe] is a content, in mass %, of Fe.