Nippon Steel Corporation

Jin Takamura

Mitsuo Ishii

Hirofumi Yoshimura

Kinichi Kimura

Masayuki Hayashi

In the production of titanium and (.alpha.+.beta.)-type titanium alloy materials, a material hydrogenated in an amount of 0.02 to 2% by weight of hydrogen is worked at a temperature of 450.degree. to 900.degree. C. at a reduction of more than 60%, and the material is dehydrogenated and annealed in vacuum. The working of the titanium material is carried out at 450.degree. to 800.degree. C., and the working of the (.alpha.+.beta.)-type titanium alloy material is carried out at 550.degree. to 900.degree. C. Furthermore, in the production of titanium, .alpha.-type titanium alloy, and (.alpha.+.beta.)-type titanium alloy materials, a material hydrogenated in an amount of 0.02 to 2% by weight of hydrogen is subjected to a heat treatment wherein the material is heated at a temperature not lower than the .beta. transformation temperature and then cooled, the material is worked at a temperature of 450.degree. to 950.degree. C. at a reduction not lower than 20%, the material is dehydrogenated and annealed in the vacuum, the working of the titanium material is carried out at 450.degree. to 800.degree. C., the working of the .alpha.-type titanium alloy material is carried out at 600.degree. to 950.degree. C., and the working of the (.alpha.+.beta.)-type titanium alloy material is carried out at 550.degree. to 900.degree. C.

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Kawasaki, Japan

Jin Takamura