Alloy

Abstract

There is provided an alloy that has sufficient creep strength in a high temperature environment, and that is capable of achieving both excellent stress relaxation cracking resistance and excellent weld hot cracking resistance. An alloy according to the present disclosure consists of, in mass %, C: 0.050 to 0.100%, Si: 1.00% or less, Mn: 1.50% or less, P: 0.035% or less, S: 0.0015% or less, Cr: 19.00 to 23.00%, Ni: 30.00 to 35.00%, N: 0.100% or less, Al: 0.15 to 0.70%, Ti: 0.15 to 0.70%, and B: 0.0010 to 0.0050%, with the balance being Fe and impurities, and satisfies Formula (1) and Formula (2).0.6<A⁢1+Ti<1.2(1)1.12≤Ti/A⁢1(2)

1 . An alloy having a chemical composition consisting of, in mass %,
 C: 0.050 to 0.100%,   Si: 1.00% or less,   Mn: 1.50% or less,   P: 0.035% or less,   S: 0.0015% or less,   Cr: 19.00 to 23.00%,   Ni: 30.00 to 35.00%,   N: 0.100% or less,   Al: 0.15 to 0.70%,   Ti: 0.15 to 0.70%,   B: 0.0010 to 0.0050%,   Nb: 0 to 0.30%,   Ta: 0 to 0.50%,   V: 0 to 1.00%,   Zr: 0 to 0.10%,   Hf: 0 to 0.10%,   Cu: 0 to 1.00%,   Mo: 0 to 1.00%,   W: 0 to 1.00%,   Co: 0 to 1.00%,   Ca: 0 to 0.0200%,   Mg: 0 to 0.0200%, and   rare earth metal: 0 to 0.1000%,   with the balance being Fe and impurities, and   satisfying Formula (1) and Formula (2):   
       
         
           
             
               
                 
                   
                     0.6 
                     < 
                     
                       Al 
                       + 
                       Ti 
                     
                     < 
                     1.2 
                   
                 
                 
                   
                     ( 
                     1 
                     ) 
                   
                 
               
             
           
         
         
           
             
               
                 
                   
                     1.2 
                     ≤ 
                     
                       Ti 
                       / 
                       Al 
                     
                   
                 
                 
                   
                     ( 
                     2 
                     ) 
                   
                 
               
             
           
         
         where, a content of a corresponding element in the chemical composition of the alloy is substituted in percent by mass for each symbol of an element in Formula (1) and Formula (2). 
       
     
     
         2 . The alloy according to  claim 1 , wherein:
 when a content of Ti in percent by mass in a residue obtained by an electrolytic extraction method is defined as [Ti] R , the alloy further satisfies Formula (3):   
       
         
           
             
               
                 
                   
                     0.05 
                     < 
                     
                       
                         [ 
                         Ti 
                         ] 
                       
                       R 
                     
                     < 
                     
                       
                         0.72 
                             
                         Ti 
                       
                       - 
                       
                         0.01 
                         
                           ( 
                           
                             Ti 
                             / 
                             Al 
                           
                           ) 
                         
                       
                       - 
                       0.11 
                     
                   
                 
                 
                   
                     ( 
                     3 
                     ) 
                   
                 
               
             
           
         
         where, a content of a corresponding element in the chemical composition of the alloy is substituted in percent by mass for each symbol of an element in Formula (3). 
       
     
     
         3 . The alloy according to  claim 1 , comprising one or more elements selected from a group consisting of:
 Nb: 0.01 to 0.30%,   Ta: 0.01 to 0.50%,   V: 0.01 to 1.00%,   Zr: 0.01 to 0.10%,   Hf: 0.01 to 0.10%,   Cu: 0.01 to 1.00%,   Mo: 0.01 to 1.00%,   W: 0.01 to 1.00%,   Co: 0.01 to 1.00%,   Ca: 0.0001 to 0.0200%,   Mg: 0.0001 to 0.0200%, and   rare earth metal: 0.001 to 0.1000%.   
     
     
         4 . The alloy according to  claim 2 , comprising one or more elements selected from a group consisting of:
 Nb: 0.01 to 0.30%,   Ta: 0.01 to 0.50%,   V: 0.01 to 1.00%,   Zr: 0.01 to 0.10%,   Hf: 0.01 to 0.10%,   Cu: 0.01 to 1.00%,   Mo: 0.01 to 1.00%,   W: 0.01 to 1.00%,   Co: 0.01 to 1.00%,   Ca: 0.0001 to 0.0200%,   Mg: 0.0001 to 0.0200%, and   rare earth metal: 0.001 to 0.1000%.