Cast Iron Comprising Cobalt and Component

Abstract

Cast iron alloys have application limits with regard to temperature. By means of the use of cobalt an optimal ferritic structure can be achieved such that with an alloy containing silicon 2.0-4.5 wt. %, cobalt 0.5-5 wt. %, carbon 2.5-4 wt. %, molybdenum≦1 wt. %, manganese≦0.25 wt. %, nickel≦0.3 wt. %, the remainder iron where the proportion of silicon cobalt and molybdenum is less than 7.5 wt. % the application limits are shifted to higher temperatures.

1 - 35 . (canceled) 
   
   
       36 . An alloy comprising in wt %: 
     
       
         
               
               
               
             
                   
                   
               
                   
                 silicon 
                 2.0%-4.5%; 
               
                   
                 cobalt 
                 0.5%-5%; 
               
                   
                 carbon 
                 2.0%-4.5%; 
               
                   
                 molybdenum 
                 ≦1.5%; 
               
                   
                 manganese 
                 ≦0.25%; 
               
                   
                 nickel 
                 ≦0.5%; and 
               
                   
                 iron. 
               
                   
                   
               
           
              
             
             
              
              
              
              
              
              
              
              
             
          
         
       
     
   
   
       37 . The alloy as claimed in  claim 36 , wherein the proportion of silicon, cobalt and molybdenum is less than 7.5 wt %. 
   
   
       38 . The alloy as claimed in  claim 36 , comprising from 1.0 wt % to 2.0 wt % cobalt. 
   
   
       39 . The alloy as claimed in  claim 36 , further comprising molybdenum. 
   
   
       40 . The alloy as claimed in  claim 36 , free of molybdenum. 
   
   
       41 . The alloy as claimed in  claim 36 , further comprising manganese. 
   
   
       42 . The alloy as claimed in  claim 41 , wherein the manganese content is ≦0.07 wt %. 
   
   
       43 . The alloy as claimed in  claim 36 , free of manganese. 
   
   
       44 . The alloy as claimed in  claim 36 , further comprising nickel. 
   
   
       45 . The alloy as claimed in  claim 36 , free of nickel. 
   
   
       46 . The alloy as claimed in  claim 36 , further comprising 2.0 wt %-3.0 wt % silicon. 
   
   
       47 . The alloy as claimed in  claim 36 , further comprising from 3.5 wt % to 4.0 wt % carbon. 
   
   
       48 . The alloy as claimed in  claim 36 , further comprising at most 0.07 wt % phosphorus. 
   
   
       49 . The alloy as claimed in  claim 36 , further comprising at most 0.008 wt % sulfur. 
   
   
       50 . The alloy as claimed in  claim 36 , further comprising at most 0.05 wt % magnesium. 
   
   
       51 . The alloy as claimed in  claim 36 , free of chromium. 
   
   
       52 . The alloy as claimed in  claim 36 , free of magnesium. 
   
   
       53 . The alloy as claimed in  claim 36 , consisting of iron, silicon, cobalt and carbon. 
   
   
       54 . The alloy as claimed in  claim 36 , consisting of iron, silicon, cobalt, carbon and manganese. 
   
   
       55 . A housing part, comprising an alloy having iron and in wt %: 
     
       
         
               
               
               
             
                   
                   
               
                   
                 silicon 
                 2.0%-4.5%; 
               
                   
                 cobalt 
                 0.5%-5%; 
               
                   
                 carbon 
                 2.0%-4.5%; 
               
                   
                 molybdenum 
                 ≦1.5%; 
               
                   
                 manganese 
                 ≦0.25%; 
               
                   
                 nickel 
                 ≦0.5%. 
               
                   
                   
               
           
              
             
             
              
              
              
              
              
              
              
             
          
         
       
     
   
   
       56 . A component, comprising an alloy having iron and in wt %: 
     
       
         
               
               
               
             
                   
                   
               
                   
                 silicon 
                 2.0%-4.5%; 
               
                   
                 cobalt 
                 0.5%-5%; 
               
                   
                 carbon 
                 2.0%-4.5%; 
               
                   
                 molybdenum 
                 ≦1.5%; 
               
                   
                 manganese 
                 ≦0.25%; 
               
                   
                 nickel 
                 ≦0.5%, 
               
                   
                   
               
           
              
             
             
              
              
              
              
              
              
              
             
          
         
       
     
     wherein the component is a steam turbine or a gas turbine. 
   
   
       57 . The component as claimed in  claim 56 , a substrate which is iron-based or steel-based.