Golf club

Abstract

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.

What is claimed:  
     
         1 . A golf club having a head, said head being constructed of a plurality of members including a face member, wherein a cold rolled beta type titanium alloy which is subjected to direct aging treatment is used for a material of the face member.  
     
     
         2 . A golf club according to  claim 2 , wherein said aging treatment is performed in a range of from 300° C. to 600° C.  
     
     
         3 . A golf club according to  claim 1 , wherein said beta type titanium alloy is in a beta single phase.  
     
     
         4 . A golf club according to  claim 2 , wherein said beta type titanium alloy is in a beta single phase.  
     
     
         5 . A golf club according to  claim 3 , wherein said material is hot rolled into a beta single phase, which is then cold rolled and subjected to direct aging treatment.  
     
     
         6 . A golf club according to  claim 4 , wherein said material is hot rolled into a beta single phase, which is then cold rolled and subjected to direct aging treatment.  
     
     
         7 . A golf club having a head, said head being constructed of a plurality of members including a face member, wherein a beta type titanium alloy which is cold rolled to 15% cold reduction is used for a material of the face member.  
     
     
         8 . A golf club according to  claim 7 , wherein said cold rolled material is subjected to direct aging treatment.  
     
     
         9 . A golf club according to  claim 8 , wherein said aging treatment is performed in a range of from 300° C. to 600° C.  
     
     
         10 . A golf club according to  claim 7 , wherein said cold rolled material is a beta type titanium alloy in a beta single phase.  
     
     
         11 . A golf club according to  claim 8 , wherein said cold rolled material is a beta type titanium alloy in a beta single phase.  
     
     
         12 . A golf club according to  claim 9 , wherein said cold rolled material is a beta type titanium alloy in a beta single phase.