| 摘要 |
PURPOSE:To manufacture a sheet metal having high resistance to high-temp. buckling and showing superior sacrificial anode effect on an extruded perforated tube, by specifying the annealing and cold rolling conditions, after hot rolling, of a clad material of an Al alloy as core material in which composition is specified and a brazing filler metal. CONSTITUTION:Both sides of an Al alloy, as core material, consisting of, by weight, 0.6-2.0% Mn, 0.31-0.80% Fe, 0.05-0.6% Si, 0.5-2.0% Zn, and the balance Al are coated with an Al-Si-(Mg) brazing filler metal. At the time of subjecting this clad material to heating or homogenizing treatment and then to hot and cold rollings, two-time or more process annealings are applied in the process after hot rolling. Moreover, single or more cold rollings are applied at 5-<40% draft in the course between the last process annealing but one and the last process annealing, and the draft in the course from the last process annealing until the final sheet thickness is reached is regulated to 10-30%.
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