| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a golf club head with an excellent rebound performance. SOLUTION: This golf club head 1 includes at least a face part 2 made ofβ-type titanium alloy. On at least a part of a boundary domain Y of the face part made ofβ-type titanium alloy, a local heat process is given, which carries out heating locally.</p> |
