Α + β type titanium alloy cold-rolled annealed sheet having high strength and high Young's modulus and method for producing the same

摘要

An object of the present invention is to provide an α + β type titanium alloy cold-rolled annealed plate having high strength and Young's modulus in the plate width direction. When analyzing the texture in the plate surface direction of the titanium alloy plate, the X-ray relative intensity peak value (XTD) in the direction close to the plate width direction and the plate surface normal direction on the (0002) pole figure of the α phase The ratio XTD / XND of X-ray relative intensity peak value (XND) in the direction close to 5 is 5.0 or more, Fe: 0.8 to 1.5% by mass%, N: 0.020% or less, oxygen, etc. The quantity Q is 0.34 to 0.55. The titanium alloy sheet is annealed at 500 ° C. or more and less than 800 ° C. when the cold rolling rate is less than 25%, and at 500 ° C. or more and less than 620 ° C. when the cold rolling rate is 25% or more.