High-strength α+β titanium alloy hot-rolled sheet excellent in cold coil handling property and process for producing the same

An α+β titanium alloy hot-rolled sheet, comprising, in mass %, Fe:

• 0.8 to 1.5%, Al:
• 4.8 to 5.5%, and N:
• 0.030% or less, and, containing O and N to satisfy the condition that Q defined by the following formula (1) is 0.14 to 0.38, with the balance being Ti and unavoidable impurities, wherein,
• (a) the normal direction of a hot-rolled sheet is taken as ND, the hot rolling direction is taken as RD, the hot-rolling width direction is taken as TD, the normal direction of the α-phase (0001) plane is taken as c-axis orientation, the angle formed between the c-axis orientation and the ND is taken as θ, and the 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 grains where θ is from 0 to 30° and φ falls in the entire circumference from −180 to 180° , the highest intensity is taken as XND;
• (b2) among (0002) relative reflection intensities of X-ray caused by grains where θ is from 80 to less than 100° and φ falls in ±10° , the highest intensity is taken as XTD;
• and
• (c) XTD/XND is 4.0 or more:
• Q =[O]+2.77·[N] (1)
• wherein [O]:
• the mass % content of O, and [N]:
• the mass % content of N.