Use of a non-corrosive, martensitically hardening steel

Abstract

The aim of the invention is to produce mechanically driven rotary tools, preferably boring, milling, grinding and cutting tools which are stable, non-corrosive and biocompatible and also have high mechanical strength properties, in conjunction with good ductility properties. To this end, the invention relates to the use of a precipitation-hardenable, martensitic, stainless chromium-nickel steel having the following composition (in weight %): 10 to 14 of chromium; 7 to 11 nickel; 0.5 to 6 of molybdenum; 0.5 to 4 of copper; 0.05 to 0.55 of aluminium; 0.4 to 1.4 of titanium; up to 0.3 of carbon and nitrogen; less than 0.05 of sulphur; less than 0.05 of phosphorus; up to 0.5 of manganese; up to 0.5 of silicon; respectively up to 0.2 of tantalum, niobium, vanadium and wolfram; and optionally up to 9 of cobalt; optionally 0.0001 to 0.1 of boron; the reminder consisting of iron and common impurities.

1 . Use of a precipitation-hardenable, martensitic, rustless chrome nickel steel with the following composition (in wt.-%):  
     
       
         
               
               
             
                   
               
                   
               
                 Chromium 
                 10 to 14 
               
                 Nickel 
                 7 to 11 
               
                 Molybdenum 
                 0.5 to 6 
               
                 Copper 
                 0.5 to 4 
               
                 Aluminium 
                 0.05 to 0.55 
               
                 Titanium 
                 0.4 to 1.4 
               
                 Carbon + nitrogen 
                 up to 0.3 
               
                 Sulphur 
                 less than 0.05 
               
                 Phosphorus 
                 less than 0.05 
               
                 Manganese 
                 up to 0.5 
               
                 Silicon 
                 up to 0.5 
               
                 Tantalum, niobium, vanadium and tungsten 
                 each up to 0.2 
               
                 Cobalt 
                 where appropriate up to 9.0 
               
                 Boron 
                 where appropriate up to 9.0 
               
                   
               
                   
               
           
              
              
             
             
              
              
              
              
              
              
              
              
              
              
              
              
              
              
              
              
             
          
         
       
       the remainder comprising iron and customary impurities for the manufacture of machine-operated rotary tools.  
     
   
   
       2 . Use according to  claim 1 , wherein the rotary tools have geometrically defined cutting edges.  
   
   
       3 . Use according to  claim 1 , wherein the rotary tools have non-geometrically defined cutting edges.  
   
   
       4 . Use according to  claim 1 , wherein the rotary tools are medical tools and instruments.  
   
   
       5 . A machine-operated rotary tool made from a precipitation-hardenable, martensitic, rustless chrome nickel steel having a composition (in wt.-%) comprising:  
     
       
         
               
               
             
                   
               
                   
               
                 Chromium 
                 10 to 14 
               
                 Nickel 
                 7 to 11 
               
                 Molybdenum 
                 0.5 to 6 
               
                 Copper 
                 0.5 to 4 
               
                 Aluminium 
                 0.05 to 0.55 
               
                 Titanium 
                 0.4 to 1.4 
               
                 Carbon + nitrogen 
                 up to 0.3 
               
                 Sulphur 
                 less than 0.05 
               
                 Phosphorus 
                 less than 0.05 
               
                 Manganese 
                 up to 0.5 
               
                 Silicon 
                 up to 0.5 
               
                 Tantalum, niobium, vanadium and 
                 each up to 0.2 
               
                 tungsten 
               
                 Cobalt 
                 where appropriate up to 9.0 
               
                 Boron 
                 where appropriate 0.0001 to 0.1 
               
                   
               
                   
               
           
              
              
             
             
              
              
              
              
              
              
              
              
              
              
              
              
              
              
              
              
              
             
          
         
       
       remainder comprising iron and customary impurities.  
     
   
   
       6 . The machine-operated rotary tool according to  claim 5 , wherein the rotary tool has geometrically defined cutting edges.  
   
   
       7 . The machine-operated rotary tool according to  claim 5 , wherein the rotary tool has non-geometrically defined cutting edges.  
   
   
       8 . The machine-operated rotary tool according to  claim 5 , wherein the rotary tool is a—medical tool or instrument.  
   
   
       9 . A precipitation-hardenable, martensitic, rustless chrome nickel steel for use in the manufacture of machine-operated rotary tools, the steel having a composition (in wt.-%) comprising:  
     
       
         
               
               
             
                   
               
                   
               
                 Chromium 
                 10 to 14 
               
                 Nickel 
                 7 to 11 
               
                 Molybdenum 
                 0.5 to 6 
               
                 Copper 
                 0.5 to 4 
               
                 Aluminium 
                 0.05 to 0.55 
               
                 Titanium 
                 0.4 to 1.4 
               
                 Carbon + nitrogen 
                 up to 0.3 
               
                 Sulphur 
                 less than 0.05 
               
                 Phosphorus 
                 less than 0.05 
               
                 Manganese 
                 up to 0.5 
               
                 Silicon 
                 up to 0.5 
               
                 Tantalum, niobium, vanadium and tungsten 
                 each up to 0.2 
               
                 Cobalt 
                 where appropriate up to 9.0 
               
                 Boron 
                 where appropriate up to 9.0 
               
                   
               
                   
               
           
              
              
             
             
              
              
              
              
              
              
              
              
              
              
              
              
              
              
              
              
             
          
         
       
       remainder comprising iron and customary impurities.  
     
   
   
       10 . The steel according to  claim 9 , wherein the rotary tools have geometrically defined cutting edges.  
   
   
       11 . The steel according to  claim 9 , wherein the rotary tools have non-geometrically defined cutting edges.  
   
   
       12 . The steel according to  claim 9 , wherein the rotary tools are medical tools or instruments.  
   
   
       13 . The steel according to one of claims  9 , wherein the rotary tools are drilling, milling, grinding or cutting tools.  
   
   
       14 . Use according to  claim 1 , wherein the rotary tools are drilling, milling, grinding or cutting tools.