Use of a hard metal alloy

Abstract

The invention relates to the use of a hard metal alloy for parts, which are subject particularly to torsion in addition to wear. Said hard metal alloy substantially contains tungsten carbide having an average grain size of less than 1.2 μm and 13 to 23 percent by weight of binder metal which comprises one or several metals that is/are selected among the group consisting of cobalt, iron, and nickel.

1 - 8 . (canceled)  
   
   
       9 . A hard metal alloy component, consisting essentially of: 
 tungsten carbide having a mean grain size of less than 1.2 μm;    13 to 23% by weight of one or more binder metals selected from the group consisting of cobalt, iron, and nickel; and    formed into a component resistant to wear and resistant to torsional loads.    
   
   
       10 . The hard metal alloy component according to  claim 9 , wherein said tungsten carbide has a mean grain size in a range from 0.7 to 0.9 μm, and said binder metal includes 13 to 17% by weight of cobalt.  
   
   
       11 . The hard metal alloy component according to  claim 9 , wherein the alloy has a coarse-grain fraction of up to 200 grains/mm 2  with a mean grain size in a range from 6-15 μm.  
   
   
       12 . The hard metal alloy component according to  claim 9 , formed as a screwdriver bit.  
   
   
       13 . A screwdriver bit made from an alloy according to  claim 9 .  
   
   
       14 . A method for producing a screwdriver bit, comprising: 
 providing an alloy of tungsten carbide having a mean grain size of less than 1.2 μm, and 13 to 23% by weight of one or more binder metals selected from the group consisting of cobalt, iron, and nickel; and    forming the screwdriver bit from the alloy by metal powder injection molding.    
   
   
       15 . The method for producing a screwdriver bit according to  claim 14 , which comprises machining a plurality of parallel web-like elevations running at approximately 45° to a longitudinal axis of the screwdriver bit into an injection mold directly beneath a screwdriver tip.  
   
   
       16 . A screwdriver bit, comprising: an alloy body of tungsten carbide having a mean grain size of less than 1.2 μm and 13 to 23% by weight of one or more binder metals selected from the group consisting of cobalt, iron, and nickel, produced by metal powder injection molding in an injection mold, said alloy body having a plurality of parallel grooves formed therein at approximately 45° to a longitudinal axis of the screwdriver bit directly beneath a screwdriver tip.