Α+Β TYPE COLD-ROLLED AND ANNEALED TITANIUM ALLOY SHEET HAVING HIGH STRENGTH AND HIGH YOUNG'S MODULUS, AND METHOD FOR PRODUCING SAME

摘要

The purpose of the present invention is to provide an α+β type cold-rolled and annealed titanium alloy sheet having high strength in the sheet-width direction and a high Young's modulus. When the crystal structure of the titanium alloy sheet is analyzed in the sheet surface direction, the ratio of the value of an X-Ray relative intensity peak in a direction close to the sheet-width direction (XTD) and the value of an X-Ray relative intensity peak in a direction close to the normal line of the sheet surface (XND) (XTD/XND) is 5.0 or higher in a pole figure of the (0002) surface of the α phase, and the titanium alloy sheet has a Fe content of 0.8-1.5 mass %, a N content of 0.020 mass % or less, and an oxygen equivalent value (Q) of 0.34-0.55. Annealing of the titanium alloy sheet is carried out at a temperature of not lower than 500°C but lower than 800°C in cases where the cold rolling rate is less than 25%, and at a temperature of not lower than 500°C but lower than 620°C in cases where the cold rolling rate is 25% or higher.