Patent ID: 6660108
Filing Date: 2003-12-09
Classification: C22C,C22F,Y10T

Abstract:
A method of producing an aluminum alloy fin material for brazing, which comprises:casting an aluminum alloy by continuous cast-rolling to produce a cast coil with a thickness of 2.5 mm or more but 9 mm or less, wherein the aluminum alloy comprises more than 0.1 wt % but 3 wt % or less of Ni, more than 1.5 wt % but 2.2 wt % or less of Fe, and 1.2 wt % or less of Si, and at least one selected from the group consisting of 4 wt % or less of Zn, 0.3 wt % or less of In, and 0.3 wt % or less of Sn, and further comprises, if necessary, at least one selected from the group consisting of 3.0 wt % or less of Co, 0.3 wt % or less of Cr, 0.3 wt % or less of Zr, 0.3 wt % or less of Ti, 1 wt % or less of Cu, 0.3 wt % or less of Mn, and 1 wt % or less of Mg, the balance being unavoidable impurities and aluminum, cold-rolling the aluminum alloy; annealing the aluminum alloy at 250 to 500Â° C. repeating the cold rolling one or more additional times and optionally repeating the annealing between repeated cold rolling until a cold rolled aluminum alloy of 0.4 mm or more but 2.0 mm or less thickness is produced; annealing at 250 to 500Â° C. the 0.4 to 2 mm thick cold rolled aluminum alloy; cold rolling the aluminum alloy thereby producing the aluminum alloy fin material of a thickness of 0.10 mm or less; and performing a final annealing under heating conditions that do not allow complete recrystallization.