a+ß TYPE TITANIUM ALLOY SHEET WITH EXCELLENT COLD ROLLING PROPERTIES AND COLD HANDLING PROPERTIES, AND PRODUCTION METHOD THEREFOR

摘要

Provided is a hot-rolled titanium alloy sheet having excellent cold rolling properties and excellent cold handling properties whereby cracks are prevented from spreading along the sheet-width direction during cold rolling, and cold rolling can be performed easily. An a+ß type hot-rolled titanium alloy sheet, wherein: (a) ND represents the normal direction of a hot-rolled sheet; RD represents the hot rolling direction; TD represents the hot rolling width direction; ? represents the angle formed between the orientation of C axis (a normal direction of an a-phase (0001) plane) and the direction of ND; F represents the angle formed between a plane including the orientation of the c axis and the direction of ND, and a plane including the direction of ND and the direction of TD; (b1) XND represents the highest (0002) relative intensity of the X-ray reflection caused by crystal grains when ? is from 0º to 30º and F is within the entire circumference (-180º to 180º); (b2) XTD represents the highest (0002) relative intensity of the X-ray reflection caused by crystal grains when ? is from 80º to 100º and F is ±10º. (c) The a+ß type titanium alloy sheet has a value for XTD/TND of at least 5.0.