Golf club head

Abstract

A golf club head has a loft no less than 38°. The golf club head also comprises a material having a material composition that includes an Iron content that by weight is highest of all constituents. The material composition also has a Chromium content no less than 10.5% by weight and a Nickel content no greater than 0.5% by weight.

What is claimed is: 
     
         1 . A golf club head comprising:
 a loft no less than 38°; and   a material having a material composition such that:
 (a) an Iron content by weight is highest of all constituents; 
 (b) a Chromium content is no less than 10.5% by weight; and 
 (c) a Nickel content is no greater than 0.5% by weight. 
   
     
     
         2 . The golf club head of  claim 1 , further comprising a rear portion having a perimeter-weighted element. 
     
     
         3 . The golf club head of  claim 1 , further comprising:
 a striking face having a face center;   a center of gravity;   a distance D 1  being a lateral distance between the center of gravity and the face center, when the golf club head is in a reference position, D 1  being no greater than 6 mm.   
     
     
         4 . The golf club head of  claim 3 , wherein D 1  is no greater than 4 mm. 
     
     
         5 . The golf club head of  claim 1 , further comprising:
 a hosel portion having a hosel bore configured to receive a golf shaft, the hosel bore having a side surface and an abutment surface; and   an auxiliary recess extending sole-ward from the abutment surface.   
     
     
         6 . The golf club head of  claim 1 , further comprising:
 a main body having a rear portion and a recess located in the rear portion;   a plaque secured to the recess forming a substantially enclosed hollow portion.   
     
     
         7 . The golf club head of  claim 6 , wherein the plaque has an overall density less than 7 g/cm 3 . 
     
     
         8 . The golf club head of  claim 6 , further comprising:
 a striking face having scorelines thereon, the scorelines defining a toe-most extent and a heel-most extent, the plaque extending a lateral distance that is a majority of a lateral distance between the heel-most extent and the toe-most extent.   
     
     
         9 . The golf club head of  claim 1  that, when oriented in a reference position, further comprises:
 a center of gravity; and 
 a moment of inertia, Izz, about a vertical virtual axis passing through the center of gravity, Izz being no less than 3000 g·cm 2 .  10  The golf club head of  claim 1  that, when oriented in a reference position, further comprises: 
 a center of gravity; and 
 a moment of inertia, Iyy, about a virtual axis passing through the center of gravity and extending in the heel to toe direction, Iyy being no less than 1200 g·cm 2 . 
 
     
     
         11 . A golf club head comprising:
 a center of gravity;   a moment of inertia, Iyy, about a virtual axis passing through the center of gravity and extending in the heel to toe direction, Iyy being no less than 1200 g·cm 2 ; and   a material having a material composition such that:
 (a) an Iron content by weight is highest of all constituents; 
 (b) a Chromium content is no less than 10.5% by weight; and 
 (c) a Nickel content is no greater than 0.5% by weight. 
   
     
     
         12 . The golf club head of  claim 11 , further comprising:
 a striking face having a face center;   a center of gravity;   a distance D 1  being a lateral distance between the center of gravity and the face center, when the golf club head is in a reference position, D 1  being no greater than 4 mm.   
     
     
         13 . The golf club head of  claim 11 , further comprising:
 a main body having a rear portion and a recess located in the rear portion;   a plaque secured to the recess forming a substantially enclosed hollow portion.   
     
     
         14 . The golf club head of  claim 13 , wherein the plaque has an overall density less than 7 g/cm 3 . 
     
     
         15 . The golf club head of  claim 13 , further comprising:
 a striking face having scorelines thereon, the scorelines defining a toe-most extent and a heel-most extent, the plaque extending a lateral distance that is a majority of a lateral distance between the heel-most extent and the toe-most extent.   
     
     
         16 . The golf club head of  claim 11  that, when oriented in a reference position, further comprises:
 a center of gravity; and 
 a moment of inertia, Izz, about a vertical virtual axis passing through the center of gravity, Izz being no less than 3000 g·cm 2 . 
 
     
     
         17 . A golf club head comprising:
 a striking face having a face center;   a center of gravity;   a distance D 1  being a lateral distance between the center of gravity and the face center, when the golf club head is in a reference position, D 1  being no greater than 4 mm; and   a material having a material composition such that:
 (a) an Iron content by weight is highest of all constituents; 
 (b) a Chromium content is no less than 10.5% by weight; and 
 (c) a Nickel content is no greater than 0.5% by weight. 
   
     
     
         18 . The golf club head of  claim 17 , further comprising:
 a main body having a rear portion and a recess located in the rear portion;   a plaque secured to the recess forming a substantially enclosed hollow portion.   
     
     
         19 . The golf club head of  claim 18 , wherein the plaque has an overall density less than 7 g/cm 3 . 
     
     
         20 . The golf club head of  claim 17  that, when oriented in a reference position, further comprises:
 a center of gravity; and 
 a moment of inertia, Izz, about a vertical virtual axis passing through the center of gravity, Izz being no less than 3000 g·cm 2 .