Aluminum alloy fin material for heat exchanger, method for manufacturing same, and heat exchanger

Abstract

The purpose of the present invention is to provide an aluminum alloy fin material for a heat exchanger having excellent corrugated moldability and excellent strength after brazing heating. This fin material comprises, in terms of percentage by mass, Si: 0.5-1.5%, Fe: 0.1-1.0%, Mn: 0.8-2.2%, Zn: 0.4-2.5, and 0.02-0.3% of one or more of Cu, Ti, Zr, Cr, and V, the balance being Al and unavoidable impurities. In the metallic structure before brazing heating, the density of second-phase particles having an equivalent circle diameter of less than 0.1 [mu]m is lower than 1*107 particles / mm2, the density of the second-phase particles having an equivalent circle diameter of 0.1 [mu]m or larger is 5*104 particles / mm2 or higher, the tensile strength before brazing heating TSB (N / mm2), the tensile strength after brazing heating TSB (N / mm2), and the sheet thickness t ([mu]m) of the fin material satisfy the relationship of 0.4<=(TSB-TSA) / t<=2.1, and the sheet thickness is 150 [mu]m or less.

Description

[0001] 【Technical field】 [0002] The present invention relates to an aluminum alloy fin material for heat exchangers excellent in corrugation formability and strength after brazing heating, a method for producing the same, and a heat exchanger using the above-mentioned fin material, which is particularly suitable for use as a radiator, Fin materials for heat exchangers such as heater cores, capacitors, and intercoolers. [0003] 【Background technique】 [0004] Aluminum alloys are used in automotive heat exchangers such as radiators, capacitors, evaporators, heater cores, intercoolers, etc. due to their light weight and high thermal conductivity. [0005] Such heat exchangers have conventionally been used by brazing and joining aluminum alloy fins formed into waves by, for example, corrugation. As the aluminum alloy fin material, pure aluminum-based alloys such as JIS1050 alloy excellent in thermal conductivity, and Al-Mn-based alloys such as JIS3003 alloy excellent in strengt...

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Problems solved by technology

[0007] However, as the thinning of the fin material progresses, higher strength is required at the same time. Along with this, there is a problem that the strength before brazing heating is increased, and it is difficult to achieve it when fins are processed by corrugation. specified size

Therefore, when casting an alloy containing such an element, the second phase particles are coarsely crystallized, and there is a high possibility of accelerating die wear during corrugation forming, which is not industrially preferable.

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