Cobalt-free alloys

Abstract

A cobalt-free alloy is made essentially of: an effective concentration of up to 2.5 percent carbon; 12 to 58 percent chromium; 7 to 9 percent manganese; 4 to 5 percent silicon; 4 to 6 percent nickel; 0.08 to 0.2 percent nitrogen; the balance being iron plus incidental impurities.

1 . An alloy consisting essentially of, by weight:
 an effective concentration of up to 2.5 percent carbon;   12 to 58 percent chromium;   7 to 9 percent manganese;   4 to 5 percent silicon;   4 to 6 percent nickel;   0.08 to 0.2 percent nitrogen;   the balance being iron plus incidental impurities.   
     
     
         2 . The alloy of  claim 1 , in which there is 16 percent by weight chromium forming a first population thereof, and a second population of chromium at a concentration such that the molar ratio between chromium and carbon is 7:3. 
     
     
         3 . The alloy of  claim 1 , in which there is 16 percent by weight chromium forming a first population thereof, and a second population of chromium at a concentration a concentration such that the molar ratio between chromium and carbon is 23:6. 
     
     
         4 . The alloy of  claim 1 , in which there is, by weight:
 0.8 to 1.2 percent carbon.   
     
     
         5 . The alloy of  claim 1 , in which there is, by weight:
 1.7 to 2.0 percent carbon.   
     
     
         6 . The alloy of  claim 1 , in which there is, by weight:
 2.2 to 2.5 percent carbon.   
     
     
         7 . Powdered form of the alloy of  claim 1 . 
     
     
         8 . A method comprising applying the alloy of  claim 1  as a component part of a nuclear reactor. 
     
     
         9 . An article comprising the alloy of  claim 1 . 
     
     
         10 . An article having a coating comprising the alloy of  claim 1 .