PURPOSE: To increase a flying range by forming the head of a golf club employing a martensite aging steel comprising an Fe based alloy containing a specified amount of nickel to transmit a striking force at a higher efficiency when the golf club is swung.
CONSTITUTION: This head 1 of a golf club is molded by employing a martensite aging steel comprising an Fe based alloy containing 12-25% of nickel. The Fe based alloy containing 12-25% of nickel undergoes a solution treatment by heating at 800-1200°c for 1-4 hour to convent the metal structure thereof to martensite. Then, the molten steel thus obtained is sucked up into a lost wax mold by a decompression sucking cast method to cast the club head 1 for a wood or the like. The decompression sucking cast method is one kind of precision casting methods and a casting very close to the final dimensional accuracy is made possible only by cast working. The head of the wood among the heads 1 has a shape with an opening on a sole face thereof and the solid body such as iron can be molded by hot and/or cold forging not limited to the casting.
IKEDA MASANORI
YAGI HIROYUKI
Next Patent: IRON CLUB HEAD FOR WEDGE SHOT