NiCrFe Alloy

Abstract

The NiCrFe alloy according to the present invention has a chemical composition consisting of, in mass %, C: 0.03 to 0.15%, Si: not more than 1.00%, Mn: not more than 2.00%, P: not more than 0.040%, S: not more than 0.0050%, Cr: 18.0 to 25.0%, Ni: 25.0 to 40.0%, Ti: 0.10 to 1.60%, Al: 0.05 to 1.00%, N: not more than 0.020%, O: not more than 0.008%, and rare earth metal (REM): 0.001 to 0.100%, with the balance being Fe and impurities, the chemical composition satisfying Formulae (1) to (3): 0.50≤Ti+48Al/27≤2.20   (1) 0.40≤Ti/(Ti+48Al/27)≤0.80   (2) Σ[REM/( A (REM))]−S/32−2/3.O/16≥0   (3) where, each symbol of element in the formulae is substituted by the content (mass %) of the corresponding element, and A(REM) in Formula (3) is substituted by the atomic weight of each rare earth metal.

1 . A NiCrFe alloy, comprising a chemical composition consisting of: in mass %,
 C: 0.03 to 0.15%,   Si: not more than 1.00%,   Mn: not more than 2.00%,   P: not more than 0.040%,   S: not more than 0.0050%,   Cr: 18.0 to 25.0%,   Ni: 25.0 to 40.0%,   Ti: 0.10 to 1.60%,   Al: 0.05 to 1.00%,   N: not more than 0.020%,   O: not more than 0.008%,   Rare earth metal (REM): 0.001 to 0.100%,   B: 0 to 0.010%,   Ca: 0 to 0.010%,   Mg: 0 to 0.010%,   V: 0 to 0.5%,   Nb: 0 to 1.0%,   Ta: 0 to 1.0%,   Hf: 0 to 1.0%,   Mo: 0 to 1.0%,   W: 0 to 2.0%,   Co: 0 to 3.0%,   and Cu: 0 to 3.0%, with the balance being Fe and impurities, the chemical composition satisfying the following Formulae (1) to (3):
   0.50≤Ti+48Al/27≤2.20   (1)
 
   0.40≤Ti/(Ti+48Al/27)≤0.80   (2)
 
   Σ[REM/( A (REM))]−S/32−2/3.O/16≥0   (3)
 
   where, each symbol of element in Formulae (1) to (3) is substituted by the content (mass %) of the corresponding element, and A(REM) in Formula (3) is substituted by the atomic weight of each rare earth metal.   
     
     
         2 . The NiCrFe alloy according to  claim 1 , wherein
 the chemical composition contains   B: 0.0001 to 0.010%.   
     
     
         3 . The NiCrFe alloy according to  claim 1 , wherein
 the chemical composition contains one or two types selected from the group consisting of   Ca: 0.0001 to 0.010%, and   Mg: 0.0001 to 0.010.   
     
     
         4 - 6 . (canceled) 
     
     
         7 . The NiCrFe alloy according to  claim 2 , wherein
 the chemical composition contains one or two types selected from the group consisting of   Ca: 0.0001 to 0.010%, and   Mg: 0.0001 to 0.010.   
     
     
         8 . The NiCrFe alloy according to  claim 1 , wherein
 the chemical composition contains one or more types selected from the group consisting of   V: 0.01 to 0.5%,   Nb: 0.01 to 1.0%,   Ta: 0.01 to 1.0%, and   Hf: 0.01 to 1.0%.   
     
     
         9 . The NiCrFe alloy according to  claim 2 , wherein
 the chemical composition contains one or more types selected from the group consisting of   V: 0.01 to 0.5%,   Nb: 0.01 to 1.0%,   Ta: 0.01 to 1.0%, and   Hf: 0.01 to 1.0%.   
     
     
         10 . The NiCrFe alloy according to  claim 3 , wherein
 the chemical composition contains one or more types selected from the group consisting of   V: 0.01 to 0.5%,   Nb: 0.01 to 1.0%,   Ta: 0.01 to 1.0%, and   Hf: 0.01 to 1.0%.   
     
     
         11 . The NiCrFe alloy according to  claim 7 , wherein
 the chemical composition contains one or more types selected from the group consisting of   V: 0.01 to 0.5%,   Nb: 0.01 to 1.0%,   Ta: 0.01 to 1.0%, and   Hf: 0.01 to 1.0%.   
     
     
         12 . The NiCrFe alloy according to  claim 1 , wherein
 the chemical composition contains one or more types selected from the group consisting of   Mo: 0.01 to 1.0%,   W: 0.01 to 2.0%,   Co: 0.01 to 3.0%, and   Cu: 0.01 to 3.0%.   
     
     
         13 . The NiCrFe alloy according to  claim 2 , wherein
 the chemical composition contains one or more types selected from the group consisting of   Mo: 0.01 to 1.0%,   W: 0.01 to 2.0%,   Co: 0.01 to 3.0%, and   Cu: 0.01 to 3.0%.   
     
     
         14 . The NiCrFe alloy according to  claim 3 , wherein
 the chemical composition contains one or more types selected from the group consisting of   Mo: 0.01 to 1.0%,   W: 0.01 to 2.0%,   Co: 0.01 to 3.0%, and   Cu: 0.01 to 3.0%.   
     
     
         15 . The NiCrFe alloy according to  claim 7 , wherein
 the chemical composition contains one or more types selected from the group consisting of   Mo: 0.01 to 1.0%,   W: 0.01 to 2.0%,   Co: 0.01 to 3.0%, and   Cu: 0.01 to 3.0%.   
     
     
         16 . The NiCrFe alloy according to  claim 8 , wherein
 the chemical composition contains one or more types selected from the group consisting of   Mo: 0.01 to 1.0%,   W: 0.01 to 2.0%,   Co: 0.01 to 3.0%, and   Cu: 0.01 to 3.0%.   
     
     
         17 . The NiCrFe alloy according to  claim 9 , wherein
 the chemical composition contains one or more types selected from the group consisting of   Mo: 0.01 to 1.0%,   W: 0.01 to 2.0%,   Co: 0.01 to 3.0%, and   Cu: 0.01 to 3.0%.   
     
     
         18 . The NiCrFe alloy according to  claim 10 , wherein
 the chemical composition contains one or more types selected from the group consisting of   Mo: 0.01 to 1.0%,   W: 0.01 to 2.0%,   Co: 0.01 to 3.0%, and   Cu: 0.01 to 3.0%.   
     
     
         19 . The NiCrFe alloy according to  claim 11 , wherein
 the chemical composition contains one or more types selected from the group consisting of   Mo: 0.01 to 1.0%,   W: 0.01 to 2.0%,   Co: 0.01 to 3.0%, and   Cu: 0.01 to 3.0%.   
     
     
         20 . The NiCrFe alloy according to  claim 1 , wherein
 the NiCrFe alloy does not rupture for 300 hours or more in a stress relaxation test in which the NiCrFe alloy is subjected to tensile strain of 10% at a strain rate of 0.05 min −1  and kept as is in air atmosphere of 650° C. after being subjected to cold rolling at a reduction of area of 20%.