Aluminum alloy fin material for heat exchanger and method ofproduction of same and method of production of heat exchanger by brazing fin material

Abstract

An aluminum alloy fin material for heat exchanger that facilitates fin forming, having appropriate pre-brazing strength, and that after brazing, exhibits high strength and thermal conductivity (electric conductivity), excelling in sag-proof property, erosion resistance, self-corrosion resistance and sacrificial anode effect; a process for manufacturing the same; and a process for manufacturing a heat exchanger through use of the fin material. There is provided an aluminum alloy fin material comprising 0.7 to 1.4 wt.% Si, 0.5 to 1.4 wt.% Fe, 0.7 to 1.4 wt.% Mn, 0.5 to 2.5 wt.% Zn, impurity Mg limited to 0.05 wt.% or less, and the balance unavoidable impurities and Al, which fin material after brazing has a tensile strength of 130 MPa or greater, a proof strength of 45 MPa or greater, a recrystallization grain diameter of 500 [mu]m or more and an electric conductivity of 47% IACS or higher. Further, there is provided a process for manufacturing a fin material, including subjecting a thin slab obtained by twin-belt continuous casting of a molten metal of the above composition to cold rolling / annealing / cold rolling / annealing / cold rolling under given conditions. Still further, there is provided a process for manufacturing a heat exchanger, including brazing heating of the above fin material and thereafter cooling at a given rate.

Description

technical field [0001] The invention relates to an aluminum alloy fin material for a heat exchanger and a manufacturing method thereof, as well as a method for manufacturing a heat exchanger by brazing the fin material. Background technique [0002] The aluminum heat exchanger is composed of an aluminum alloy fin material etc. brazed to an aluminum material forming a working fluid passage. In order to improve the performance characteristics of the heat exchanger, sacrificial anode action is required as a basic characteristic of the aluminum alloy fin material to prevent corrosion of the material forming the working fluid passage. In addition, in order to avoid deformation due to high-temperature brazing heating and penetration of brazing material, excellent sag resistance and corrosion resistance are required. [0003] In order to satisfy the above basic characteristics, Mn and Fe are added to the fin material. However, work in recent years has focused on the manufacturing...

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Problems solved by technology

[0009] Furthermore, the aforementioned Japanese Patent Laid-Open (A) No. 1-91962 and Japanese Patent Laid-Open (A) No. 2-142672 disclose techniques for specifying the cooling rate after brazing heating to obtain a high-strength fin material, but no Description of electrical conductivity (thermal conductivity)

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