Cu-Added Ni-Cr-Fe-Based Alloy Brazing Material

Abstract

There is provided a Ni—Cr—Fe-based alloy brazing filler material to which Cu is added, and which has a low melting temperature, and is inexpensive and excellent in corrosion resistance and in strength, for use in manufacture of stainless-steel heat exchangers or the like, specifically, a Ni—Cr—Fe-based alloy brazing filler material, including, in mass %, Cr: 15 to 30%; Fe: 15 to 30%; Cu: 2.1 to 7.5%; P: 3 to 12%; and Si: 0 to 8%; and the balance being Ni and unavoidable impurities, wherein the total content of Cr and Fe is 30 to 54%, and the total content of P and Si is 7 to 14%.

1 . A Ni—Cr—Fe-based alloy brazing filler material, comprising, in mass %,
 Cr: 15 to 30%; 
 Fe: 15 to 30%; 
 Cu: 2.1 to 7.5%; 
 P: 3 to 12%; and 
 Si: 0 to 8%; and 
 the balance being Ni and unavoidable impurities, 
 wherein the total content of Cr and Fe is 30 to 54%, and the total content of P and Si is 7 to 14%. 
 
     
     
         2 . The Ni—Cr—Fe-based alloy brazing filler material according to  claim 1 , comprising:
 1% or less in total of at least one of B and C; 
 5% or less in total of at least one of Mo, Co, Mn, and V; and/or 
 2% or less in total of at least one of Sn, Zn, and Bi. 
 
     
     
         3 . The Ni—Cr—Fe-based alloy brazing filler material according to  claim 1 , wherein the content of Cu is more than 2.5% and less than 6%. 
     
     
         4 . The Ni—Cr—Fe-based alloy brazing filler material according to  claim 1 , wherein the total content of P+Si is more than 8% and less than 13%. 
     
     
         5 . The Ni—Cr—Fe-based alloy brazing filler material according to  claim 1 , wherein the content of Cu is more than 3% and less than 6%, and the total content of P+Si is more than 8% and less than 13%.