METHOD FOR PRODUCING HIGH STRENGTH ALUMINUM ALLOY MATERIAL FOR AUTOMOBILE HEAT EXCHANGER HAVING EXCELLENT EROSION RESISTANCE AND USED FOR HIGH STRENGTH AUTOMOBILE HEAT EXCHANGER MEMBER PRODUCED BY BRAZING

摘要

PROBLEM TO BE SOLVED: To provide a method for producing a high strength aluminum alloy material for an automobile heat exchange having excellent erosion resistance, the aluminum alloy material having high strength after brazing and excellent sacrificial anode effect and being used for a high strength automobile heat exchanger member produced by brazing.;SOLUTION: In the production method where an aluminum alloy molten metal having a composition comprising, by mass, 0.3 to 1.2% Si, 0.05 to 0.7% Fe, 0.8 to 2.0% Mn, and 0.5 to 4.0% Zn, and the balance Al with inevitable impurities is cast so as to be a sheet material of a sheet thickness of 2 to 12 mm by a continuous casting rolling process, and is directly coiled. The temperature of the aluminum alloy material directly before being coiled is controlled to ≤530°C, and the coiled aluminum alloy material is cooled at the average cooling rate of ≥15°C/hr, and is thereafter subjected to cold rolling for at least two or more times and annealing for at least two or more times so as to be a final sheet thickness of ≤0.1 mm.;COPYRIGHT: (C)2009,JPO&INPIT