Aluminum alloy fin material for heat exchangers, method of producing the same, and heat exchanger

Abstract

An aluminum alloy fin material for heat exchangers, the aluminum alloy fin material being made of aluminum alloy comprising: 1.00 to 1.60 mass % of Mn; 0.70 to 1.20 mass % of Si; 0.05 to 0.50 mass % of Fe; 0.05 to 0.35 mass % of Cu; and 1.00 to 1.80 mass % of Zn, with the balance being Al and inevitable impurities, in which a matrix of the aluminum alloy has a fibrous structure, and tensile strength thereof is 170 to 230 MPa. According to the present invention, an aluminum alloy fin material for heat exchangers having excellent formability before brazing, excellent brazing properties, and excellent strength properties and corrosion resistance after brazing can be provided.

1 . An aluminum alloy fin material for heat exchangers, the aluminum alloy fin material being made of aluminum alloy comprising: 1.00 to 1.60 mass % of Mn; 0.70 to 1.20 mass % of Si; 0.05 to 0.50 mass % of Fc; 0.05 to 0.35 mass % of Cu; and 1.00 to 1.80 mass % of Zn, with the balance being AI and inevitable impurities, wherein
 a matrix of the aluminum alloy has a fibrous structure, and   tensile strength thereof is 170 to 230 MPa.   
     
     
         2 . The aluminum alloy fin material for heat exchangers according to  claim 1 , wherein the aluminum alloy further comprises 0.20 mass % or less of Zr. 
     
     
         3 . The aluminum alloy fin material for heat exchangers according to  claim 1 , wherein the aluminum alloy is an H2n (n is an integer selected from 2, 4, and 6) material. 
     
     
         4 . The aluminum alloy tin material for heat exchangers according to  claim 2 , wherein the aluminum alloy is an H2n (n is an integer selected from 2, 4, and 6) material. 
     
     
         5 . The aluminum alloy fin material for heat exchangers according to claims t, wherein total number density of an Al—Mn-based intermetallic compound and an Al—Si—Mn-based intermetallic compound having a circle-equivalent diameter of 0.1 to 1.0 in the aluminum alloy after brazing is 0.50×10 6  particles/mm 2  or more, and a grain size thereof after brazing is 40 to 200 μm. 
     
     
         6 . The aluminum alloy fin material for heat exchangers according to  claim 2 , wherein total number density of an Al—Mn-based intermetallic compound and an Al—Si—Mn-based intermetallic compound having a circle-equivalent diameter of 0.1 to 1.0 μm in the aluminum alloy after brazing is 0.50×10 6  particles/mm 2  or more, and a grain size thereof after brazing is 40 to 200 μm. 
     
     
         7 . The aluminum alloy fin material for heat exchangers according to  claim 3 , wherein total number density of an Al—Mn-based intermetallic compound and an Al—Si—Mn-based intermetallic compound having a circle-equivalent diameter of 0.1 to 1.0 μm in the aluminum alloy after brazing is 0.50×10 6  particles/mm 2  or more, and a grain size thereof after brazing is 40 to 200 μm. 
     
     
         8 . A method of producing an aluminum alloy fin material for heat exchangers, the method comprising: without performing homogenization treatment, subjecting an ingot to hot-rolling by heating up to 400 to 500° C. to start the hot-rolling and completing the hot-rolling at 350° C. or less, the ingot being made of aluminum alloy comprising 1.00 to 1.60 mass % of Mn, 0.70 to 1.20 mass % of Si, 0.05 to 0.50 mass % of Fe, 0.05 to 0.35 mass % of Cu, and 1.00 to 1.80 mass % of Zn with the balance being A and inevitable impurities; subsequently subjecting the hot-rolled material to cold-rolling in one or a plurality of passes, or subjecting the hot-rolled material to the cold-rolling in one or a plurality of passes and intermediate annealing performed one or more times between the passes of the cold-rolling; and subsequently subjecting the cold-rolled material to final annealing. 
     
     
         9 . A heat exchanger obtained by brazing the aluminum alloy fin material for heat exchangers according to  claim 1 , wherein
 a grain size of aluminum alloy that forms a fin of the heat exchanger is 40 to 200 μm, and total number density of an Al—Mn-based intermetallic compound and an Al—Si—Mn-based intermetallic compound having a circle-equivalent diameter of 0.1 to 1.0 μm in the aluminum alloy is 0.50/10 6  particles/mm 2  or more.   
     
     
         10 . A heat exchanger obtained by brazing the aluminum alloy fin material for heat exchangers according to  claim 2 , wherein
 a grain size of aluminum alloy that forms a fin of the heat exchanger is 40 to 200 μm, and total number density of an Al—Mn-based intermetallic compound and an Al—Si—Mn-based intermetallic compound having a circle-equivalent diameter of 0.1 to 1.0 μm in the aluminum alloy is 0.50×10 6  particles/mm 2  or more.   
     
     
         11 . A heat exchanger obtained by brazing the aluminum alloy fin material for heat exchangers according to  claim 3 , wherein
 a grain size of aluminum alloy that forms a fin of the heat exchanger is 40 to 200 μm, and total number density of an Al—Mn-based intermetallic compound and an Al—Si—Mn-based intermetallic compound having a circle-equivalent diameter of 0.1 to 1.0 μm in the aluminum alloy is 0.50×10 6  particles/mm 2  or more.   
     
     
         12 . A heat exchanger obtained by brazing the aluminum alloy fin material for heat exchangers according to  claim 4 , wherein
 a grain size of aluminum alloy that forms a fin of the heat exchanger is 40 to 200 μm, and total number density of an Al—Mn-based intermetallic compound and an Al—Si—Mn-based intermetallic compound having a circle-equivalent diameter of 0.1 to 1.0 μm in the aluminum alloy is 0.50×10 6  particles/mm 2  or more.   
     
     
         13 . A heat exchanger obtained by brazing the aluminum alloy fin material for heat exchangers according to  claim 5 , wherein
 a grain size of aluminum alloy that forms a fin of the heat exchanger is 40 to 200 μm, and total number density of an Al—Mn-based intermetallic compound and an Al—Si—Mn-based intermetallic compound having a circle-equivalent diameter of 0.1 to 1.0 μm in the aluminum alloy is 0.50×10 6  particles/mm 2  or more.   
     
     
         14 . A heat exchanger obtained by brazing the aluminum alloy fin material for heat exchangers according to  claim 6 , wherein
 a grain size of aluminum alloy that forms a fin of the heat exchanger is 40 to 200 μm, and total number density of an Al—Mn-based intermetallic compound and an Al—Si—Mn-based intermetallic compound having a circle-equivalent diameter of 0.1 to 1.0 μm in the aluminum alloy is 0.50×10 6  particles/mm 2  or more.   
     
     
         15 . A heat exchanger obtained by brazing the aluminum alloy fin material for heat exchangers according to  claim 7 , wherein
 a grain size of aluminum alloy that forms a fin of the heat exchanger is 40 to 200 μm, and total number density of an Al—Mn-based intermetallic compound and an Al—Si—Mn-based intermetallic compound having a circle-equivalent diameter of 0.1 to 1.0 μm in the aluminum alloy is 0.50×10 6  particles/mm 2  or more.