| 摘要 |
PROBLEM TO BE SOLVED: To straighten anα+βtype titanium alloy straight bar in relatively high productivity and to produce a straight bar having good straightness from a wire rod made of, particularly, anα+βtype titanium alloy. SOLUTION: By inserting a bar having bends straightened from a wire rod coil ofα+βtype titanium alloy in any container among a round shape, a circular arc shape, an U shape, an V shape in cross section and holding at a prescribed hold temp. of below theβtransformation temp. for a prescribed time or more, bends of the bar is not increased at heat treatment and is efficiently reduced, further, stabilized straightness is obtained after subsequent cold straightening, cutting and grinding of a surface.
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