| 摘要 |
A method for manufacturing an alpha + beta type titanium alloy plate having a small anisotropy in strength by subjecting an alpha + beta type titanium alloy slab to a hot-rolling, which comprises: the hot-rolling comprising a cross-rolling which comprises a hot-rolling in a L-direction and a hot-rolling in a C-direction, the L-direction being a final rolling direction in the hot-rolling and the C-direction being a direction at right angles to the L-direction; and controlling the cross-rolling so that a value of an overall cross ratio of rolling (CRtotal) determined by means of the following formula is kept within a range of from 0.5 to 2.0: CRtotal=(CR1)0.6x(CR2)0.8x(CR3)1.0 where, CR1 is a cross ratio of rolling within a rolling temperature region of from under T beta DEG C. to T beta DEG C.-50 DEG C., CR2 is a cross ratio of rolling within a rolling temperature region of from under T beta DEG C.-50 DEG C. to T beta DEG C.-150 DEG C., CR3 is a cross ratio of rolling within a rolling temperature region of under T beta DEG C.-150 DEG C., and T beta DEG C. is a beta -transformation temperature of an alpha + beta type titanium alloy.
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