Nippon Steel Corporation

Casio Computer Co., Ltd.

Genki Tsukamoto

Kazuhiro Takahashi

Hideto Seto

Junichi Sato

Naoki Okamura

A watch part containing a titanium alloy, the titanium alloy, in mass %, includes: Al: 1.0 to 3.5%; Fe: 0.1 to 0.4%; O: 0.00 to 0.15%; C: 0.00 to 0.10%; Sn: 0.00 to 0.20%; Si: 0.00 to 0.15%; and the balance: Ti and impurities, an average grain diameter of &#x3b1; phase crystal grains is 15.0 &#x3bc;m or less, an average aspect ratio of the &#x3b1; phase crystal grains is 1.0 or more and 3.0 or less, and a coefficient of variation of a number density of &#x3b2;-phase crystal grains distributed in the &#x3b1; phase is 0.30 or less.

Watch part

A titanium alloy part is characterized in that it includes, by mass %: Al: 1.0 to 8.0%; Fe: 0.10 to 0.40%; O: 0.00 to 0.30%; C: 0.00 to 0.10%; Sn: 0.00 to 0.20%; Si: 0.00 to 0.15%; and the balance: Ti and impurities, in which: an average grain diameter of &#x3b1;-phase crystal grains is 15.0 &#x3bc;m or less; an average aspect ratio of the &#x3b1;-phase crystal grains is 1.0 or more and 3.0 or less; and a coefficient of variation of a number density of &#x3b2;-phase crystal grains distributed in the &#x3b1; phase is 0.30 or less.

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Tokyo, Japan

Genki Tsukamoto