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

摘要

An object of the present invention is to provide an? +? -Type titanium alloy cold annealing plate having a high strength and Young''s modulus in the sheet width direction. The titanium alloy sheet has an X-ray relative-intensity peak value (XTD) in a direction close to the plate-width direction on the? -Phase (0002) pole figure and a The ratio XTD / XND of the X-ray relative intensity peak value (XND) is 5.0 or more, Fe is 0.8 to 1.5%, N is 0.020% or less, and the oxygen equivalent Q is 0.34 to 0.55 in mass%. The annealing of the titanium alloy sheet is performed at a temperature of 500 ° C or more and less than 800 ° C for a cold rolling rate of less than 25% and at a temperature of 500 ° C or more and less than 620 ° C for a cold rolling rate of 25% or more.