Abstract: As functions demanded for an iron-type golf club, (1) Spin performance, (2) Trajectory directivity, (3) Striking feeling, (4) Follow-through feeling, (5) Distance controllability, (6) Flyer improvement, and the like are mentioned. In order to satisfy these functions, it is devised to improve the properties of an iron-type golf club by subjecting particularly a soft iron forged head to surface treatment. A foundation layer of an electroless Ni—P plating film is formed over the entire surface of a soft iron forged head and also a surface layer of an electroless Ni—P—W plating film is formed over the entire surface of the foundation layer. Heat treatment is performed at 300 to 700° C. when forming the electroless Ni—P—W plating film. The head is a wedge type head having a pitching wedge, an approach wedge, or a sand wedge.

Abstract: A sliding part has a film of an Ag-In alloy comprising 25 to 35 wt. % of In and the balance Ag and inevitable impurities and formed on a surface of a stainless steel main body thereof which surface is slidable on other stainless steel part. The Ag-In alloy has a close-packed hexagonal crystal structure of .zeta. phase.