| 摘要 |
PROBLEM TO BE SOLVED: To provide a copper alloy tube having high tensile strength, high 0.2% proof stress, a superior advantage in strength, and improved hairpin bending and tube expanding workability, and being useful for a high strength heat exchanger. SOLUTION: The copper alloy tube has a composition including, by mass%, 0.03-0.15% Co, 0.1-1.0% Sn, 0.004-0.08% P, 0.005% or less S, 0.005% or less O, 0.0002% or less H, and the balance being Cu with unavoidable impurities. Additionally, the tube preferably includes 0.01-1.0% Zn by mass%. It is also preferable to include one or more elements, in an amount of less than 0.07% in total by mass%, selected from a group of Fe, Ni, Mn, Mg, Cr, Ti, and Ag. Further, the tube preferably has a tensile strength of 250-300 N/mm<SP>2</SP>, an elongation of 40% or more, and an average crystal grain size of 10-35μm. COPYRIGHT: (C)2009,JPO&INPIT
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