Method for producing alloy

Abstract

To provide an alloy which can suppress minute temporal deformation of a Super Invar alloy as much as possible, and a method for producing the alloy. The alloy of the present invention includes iron, nickel, and cobalt, which are the basic components of a Super Invar alloy, and is characterized in that an amount of a fraction which has not carbidized in carbon contained in the alloy is 0.010 wt % or less.

1 - 10 . (canceled) 
     
     
         11 . A method for producing an alloy comprising iron, nickel, and cobalt the method comprising:
 adding carbide forming elements to iron, nickel, and cobalt and melt casting a resultant mixture;   hot forging at a predetermined temperature; and   performing a first heat treatment at a first temperature, which is lower than the predetermined temperature, so that a ratio of carbon, other than carbon contained in the carbide, to the alloy is 0.010 wt % or less.   
     
     
         12 - 16 . (canceled) 
     
     
         17 . The method according to  claim 11 , wherein the first temperature is from 825° C. to 950° C. 
     
     
         18 . The method according to  claim 11 , wherein a content of the added carbide forming elements is from 0.05 wt % to 0.50 wt %. 
     
     
         19 . The method according to  claim 11 , further comprising forming a compound phase of the nickel and the carbide forming elements by performing a second heat treatment at a second temperature, which is lower than the first temperature. 
     
     
         20 . The method according to  claim 11 , further comprising performing a third heat treatment at a third temperature, which is lower than a Curie temperature of the alloy. 
     
     
         21 . The method according to  claim 11 , wherein the third temperature is 80° C. or less. 
     
     
         22 . The method according to  claim 11 , wherein the carbide formed from carbon contained in the alloy and the carbide forming elements are precipitated by the first heat treatment.