Aluminum alloy for heat exchanger fins

A heat exchanger, aluminum alloy technology, applied in material science, aluminum manufacturing, metallurgy, material chemistry, aluminum alloy fields, can solve problems such as small corrosion potential

Active Publication Date: 2017-04-19
NOVELIS INC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, it may be desirable for the heat exchanger fins to have a lower corrosion potential than the rest of the heat exchanger so that the fins function sacrificially

Method used

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  • Aluminum alloy for heat exchanger fins
  • Aluminum alloy for heat exchanger fins

Examples

Experimental program
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Effect test

example 1

[0054]Will contain 1.0wt.%-1.1wt.% Si, 0.37wt.%-0.42wt.% Fe; 1.5wt.%-1.6wt.% Zn, 1.3wt.%-1.35wt.% Mn, 0.27wt.% - 0.33wt.% Cu, 0.04wt.% -0.05wt.% Mg aluminum alloy, the rest of which is aluminum and unavoidable impurities, DC casting into ingots. The ingots were preheated to 480°C at a heating rate of 50°C / hr within 12 hours, submerged at 460°C-480°C for 6 hours and hot rolled to a thickness of 3.5mm-4mm. Subsequently, the sheet was cold-rolled to a thickness of about 1 mm, and then to an intermediate thickness of about 123 μm, followed by an intermediate annealing treatment comprising soaking at 350° C. for 4 hours with 50° C. / Constant heating and cooling rates of hr, and subsequent cold rolling to a final wire diameter of about 80 μm, which corresponds to 35% CW. The resulting alloy material has a minimum ultimate tensile strength of about 220 MPa in the pre-brazing condition and about 150 MPa-160 MPa after brazing. The alloy material has an average electrical conductivity...

example 2

[0056] Will contain 1.0wt.%-1.1wt.% Si, 0.37wt.%-0.42wt.% Fe; 1.5wt.%-1.6wt.% Zn, 1.3wt.%-1.35wt.% Mn, 0.27wt.% - 0.33wt.% Cu, 0.04wt.% -0.05wt.% Mg aluminum alloy, the rest of which is aluminum and unavoidable impurities, DC casting into ingots. The ingots were preheated to 480°C at a heating rate of 50°C / hr within 12 hours, submerged at 460°C-480°C for 6 hours and hot rolled to a thickness of 3.5mm-4mm. Subsequently, the sheet was cold rolled to a thickness of about 1 mm, and then to an intermediate thickness, followed by an intermediate annealing treatment at two different temperatures. For intermediate annealing, alloy samples were subjected to immersion at 350°C or 500°C for 4 hours, with a constant heating and cooling rate of 50°C / hr applied before and after immersion, and subsequent cold rolling to a final wire diameter of approximately 80 μm , which corresponds to 40% CW. The alloy samples were examined for sag resistance and post-braze microstructure after applying ...

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Abstract

An aluminum alloy fin stock material comprising about 0.9-1.2 wt% of Si, 0.3-0.5 wt% of Fe, 0.20-0.40 wt% of Cu, 1.0-1.5 wt% of Mn, 0-0.1% of Mg and 0.0-3.0% of Zn, with remainder Al and impurities no more than 0.15 wt%. The aluminum alloy fin stock material is produced in a form of a sheet by a process comprising the steps of direct chill casting an ingot, hot rolling the ingot after the direct chill casting, cold rolling the aluminum alloy to an intermediate thickness, inter-annealing the aluminum alloy cold rolled to an intermediate thickness at a temperature between 200 and 400 DEG C, and cold rolling the material after inter-annealing to achieve % cold work (%CW) of 20 to 40%. The aluminum alloy fin stock material possesses an improved combination of one or more of pre- and / or post-brazes strength, conductivity, sag resistance and corrosion potential. It is useful for fabrication of heat exchanger fins.

Description

[0001] existing related applications [0002] This application claims the benefit of US Provisional Patent Application Serial No. 62 / 033,879, filed August 6, 2014, the contents of which are hereby incorporated by reference in their entirety. technical field [0003] The present invention relates to the fields of materials science, materials chemistry, metallurgy, aluminum alloys, aluminum fabrication and related fields. The present invention provides novel aluminum alloys for use in the production of heat exchanger fins that are sequentially employed in various heat exchanger devices such as automotive radiators, condensers, evaporators and related devices . Background technique [0004] The automotive heat exchanger industry presents a number of requirements for the aluminum material ("fin stock material") used to produce heat exchanger fins. These requirements can be difficult to balance. When producing heat exchanger equipment, its components are usually joined by bra...

Claims

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Application Information

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IPC IPC(8): C22C21/00C22C21/02C22C21/10C22F1/043C22F1/053F28F21/08
CPCC22C21/00C22C21/02C22C21/10C22F1/043C22F1/053F28F21/084C22F1/04B22D21/04B23K1/0012
Inventor K.M.加滕比H.艾哈迈德A.D.豪厄尔斯J.卡达利
Owner NOVELIS INC
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