High-intensity aluminum manganese alloy for heat exchanger and its manufacture method

Abstract

The invention provides an Al-Mn alloy for high strength heat exchanger and the process for preparing. The composition contents are as follows, including Si<=0.5wt%, Fe<=0.7wt%, Cu0.1-0.3wt%, Mn1.0-1.6wt%, Mg0.3-0.7wt%, Zn0.05-0.3wt%, and Cr0.05-0.15wt%. The method of manufacturing the alloy is to add Si, Fe, Cu, Mn, Mg, Cr and Zn into the industry pure aluminium ingot melt at different stage of temperature, after purifying treatment of the melt, control the cooling rate , cast and acquire Al-Mn line alloy ingot with large scale as-cast grain. After uniformly treatment, the allot ingot is hot rolled at a temperature of 470-510 DEG C and annealed at a temperature of 300-430 DEG C for 1-3h and then cold rough rolled and cold finish rolled, with the deformation of 30-70%, and at least acquire the manufactured product. The adopting states of O treatment state and H24 treatment state are achieved after the annealing of the manufactured product. The Al-Mn alloy has the advantages of good tensile strength, yield strength, elongation, hang-down resistance and low cost, thereby the Al-Mn alloy is the ideal productive material for the component of the heat exchanger.

Description

technical field [0001] The invention relates to aluminum alloys, in particular to an aluminum-manganese alloy for high-strength heat exchangers and a manufacturing method thereof, belonging to the technical field of nonferrous metals. Background technique [0002] Aluminum and its alloys have a series of excellent characteristics such as low density, corrosion resistance, good elasticity, high specific strength and specific stiffness, good impact resistance, easy surface coloring, good processing formability, and easy recycling, etc. Quantify the most desirable material. The lightweight of automotive heat exchange systems (water tank radiators, evaporators, condensers, intercoolers, heaters, and machine coolers) is a key area of ​​automotive lightweight. Since the 1970s, the weight of the heat exchange system of European mid-to-high-end cars has been reduced by more than 50%, close to 5-7kg, the weight of the whole vehicle has been reduced by more than 1%, and the fuel savi...

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to provide a high-strength aluminum-manganese alloy for heat exchangers and its manufacturing method, aiming to effectively solve the problem of the relatively low strength of existing domestic Al-Mn alloy materials. Low, unstable performance and other comprehensive performance can not meet the requirements of use, especially the problem of low tensile strength and sag resistance