Aluminum alloy fin material for heat exchanger and manufacturing method thereof

Abstract

An aluminum alloy fin material for heat exchangers, consisting of 0.5 to 1.5 mass% of Si; 0.1 to 1.0 mass% of Fe; 0.8 to 1.8 mass% of Mn; and 0.4 to 2,5 mass% of Zn, with the balance being Al and unavoidable impurities, wherein a metallographic microstructure before braze-heating is such that a density of second phase particles having a circle-equivalent diameter of less than 0.1 µm is less than 1×10 7 particles / mm 2 , and that a density of second phase particles having a circle-equivalent diameter of 0.1 µm or more is 5×10 4 particles / mm 2 or more, wherein a tensile strength before braze-heating, TS B (N / mm 2 ), a tensile strength after braze-heating, TS A (N / mm 2 ), and a sheet thickness of the fin material, t (µm), satisfy a relationship: 0.4 ‰¤ (TS B - TSA) / t ‰¤ 2.1, and wherein the sheet thickness is 150 µm or less; and a method of producing the same.

Description

technical field [0001] The present invention relates to an aluminum alloy fin material for heat exchangers excellent in corrugation formability and strength after brazing heating, and a method for producing the fin material, which is particularly suitable for use as radiators, heater cores, capacitors, intercoolers, etc. Fin materials for heat exchangers. Background technique [0002] Aluminum alloys are used in automotive heat exchangers such as radiators, capacitors, evaporators, heater cores, intercoolers, and the like because they are lightweight and have high thermal conductivity. [0003] Such heat exchangers have conventionally been used, for example, by brazing and joining fins of aluminum alloy formed into waves by 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 strength and buckling resistance are generally used. [0004] ...

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Problems solved by technology

[0005] However, as the thickness of the fin material is thinned, high 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 processing fins 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 that the wear of the mold will be accelerated during corrugation forming, which is industrially unfavorable.

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