ALUMINUM ALLOY EXTRUDED TUBE FOR HEAT EXCHANGER EXCELLENT IN CORROSION RESISTANCE

摘要

PROBLEM TO BE SOLVED: To provide an extruded tube excellent in corrosion resistance to pH in a wide range from weakly acidic to alkaline and used as a tube material for a heat exchanger or the like. SOLUTION: This tube is composed of an Al alloy having a compsn. contg. 0.1 to 3% Zn, 0.3 to 1.5% Fe and 0.05 to 0.2% Mg and moreover added with one or >= two kinds among the following (a) to (c): (a) 0.1 to 1.0% Mn, (b) one or two kinds of 0.05 to 0.7% Cu and 0.1 to 1.0% Si and (c) one or two kinds of 0.01 to 0.25% Ti and 0.01 to 0.25% Zr.