Ductile Iron Having Cobalt

Abstract

Known cast iron alloys have application limits with regard to temperature. A cast iron including cobalt is provided. Through the use of cobalt, an optimal ferritic microstructure is achieved such that with an alloy having silicon 2.0-4.5 wt %, cobalt 0.5-5 wt %, carbon 2.0-4 wt %, molybdenum 0.3-1.48 wt %, manganese ≦0.5 wt %, nickel ≦0.5 wt %, the remainder iron, wherein the proportion of silicon, cobalt, and molybdenum is preferably less than 7.5 wt %, the application limits are shifted to high temperatures.

1 - 34 . (canceled) 
     
     
         35 . An alloy comprising (in % by weight):
 silicon 2.0%-4.5%;   cobalt 0.5%-5.0%;   carbon 2.0%-4.5%; and   molybdenum 0.5%-0.8%.   
     
     
         36 . The alloy as claimed in  claim 35 , further comprising (in % by weight):
 manganese ≦0.5%,   nickel ≦0.5%,   magnesium ≦0.09%,   phosphorus ≦0.07%,   sulfur ≦0.04%,   chromium ≦0.1%, and   remainder iron.   
     
     
         37 . The alloy as claimed in  claim 35 , wherein a proportion of silicon, cobalt and molybdenum is less than 7.5% by weight. 
     
     
         38 . The alloy as claimed in  claim 35 , comprising 0.5% by weight to 1.5% by weight cobalt. 
     
     
         39 . The alloy as claimed in  claim 36 , wherein the alloy comprises at least 0.005% by weight manganese. 
     
     
         40 . The alloy as claimed in  claim 36 , wherein the alloy comprises a manganese content ≦0.07% by weight. 
     
     
         41 . The alloy as claimed in  claim 36 , wherein the alloy comprises no manganese. 
     
     
         42 . The alloy as claimed in  claim 36 , wherein the alloy comprises at least 0.01% by weight nickel. 
     
     
         43 . The alloy as claimed in  claim 36 , wherein the alloy comprises no nickel. 
     
     
         44 . The alloy as claimed in  claim 35 , wherein the alloy comprises 2.8% by weight—3.2% by weight silicon. 
     
     
         45 . The alloy as claimed in  claim 36 , wherein the alloy comprises at most 0.007% by weight phosphorus. 
     
     
         46 . The alloy as claimed in  claim 36 , which comprises at least 0.005% by weight phosphorus. 
     
     
         47 . The alloy as claimed in  claim 36 , wherein the alloy comprises at most 0.008% by weight sulfur. 
     
     
         48 . The alloy as claimed in  claim 36 , wherein the alloy comprises at least 0.001% by weight sulfur. 
     
     
         49 . The alloy as claimed in  claim 36 , wherein the alloy comprises at most 0.05% by weight magnesium. 
     
     
         50 . The alloy as claimed in  claim 36 , wherein the alloy comprises at least 0.01% by weight magnesium. 
     
     
         51 . The alloy as claimed in  claim 36 , wherein the alloy comprises no chromium. 
     
     
         52 . The alloy as claimed in  claim 36 , wherein the alloy comprises at most 0.03% by weight chromium. 
     
     
         53 . The alloy as claimed in  claim 36 , wherein the alloy comprises at least 0.01% by weight chromium. 
     
     
         54 . The alloy as claimed in  claim 35 , wherein the alloy consists of iron, silicon, cobalt, molybdenum and carbon.