Use of martensitic precipitation hardening stainless steel

Abstract

The invention relates to the use of a chrome-nickel martensitic precipitation hardening stainless steel having the following composition: 10-14 mass % chromium, 7-11 mass % nickel, 0.5-6 mass % molybdenum, 0.5-4 mass % copper, 0.05-0.55 mass % aluminium, 0.4-1.4 mass % titanium, up to 0.3 mass % carbon+nitrogen, less than 0.05 mass % sulfur, less than 0.05 mass % phosphorus, up to 0.5 mass % manganese, up to 0.5 mass % silicium, up to 0.2 mass % tantalum, niobium, vanadium and tungsten, respectively, possibly 0.9 mass % cobalt, possibly 0.0001-0.1 mass % boron, the rest being iron and ordinary impurities. Said steel is used for producing surgery implants and osteosynthesis products which are pointwisely or long-lastingly used outside and inside a body.

1 . Use of a precipitation hardenable, martensitic, stainless chrome nickel steel with the following composition (in % by weight):  
     
       
         
               
               
               
             
                   
                   
               
                   
                   
               
                   
                 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 
                 up to 0.2 each 
               
                   
                 and tungsten 
               
                   
                 Cobalt 
                 up to 9.0 if applicable 
               
                   
                 Boron 
                 0.0001 to 0.1 if applicable 
               
                   
                   
               
                   
                   
               
           
              
              
             
             
              
              
              
              
              
              
              
              
              
              
              
              
              
              
              
              
              
             
          
         
       
     
     with the remainder comprising iron and the normal impurities, for the manufacture of surgical implants and osteosynthesis products for application and remaining in or on the human body.