| 摘要 |
A golf club with an improved durability which realizes so thin a club head that the head can be enlarged, suppressing the increase of the total weight. A cold rolled material which is a beta type titanium alloy in a beta single phase and subjected to direct aging is used for the head. Preferably, the material is subjected to at least 15% cold rolling reduction. The aging is able to improve durability and surface hardness. Due to the direct aging of the cold worked material without solution treatment, such a long time heat treatment is no longer necessary, thereby resulting in the reduction of production costs.
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