| 摘要 |
PROBLEM TO BE SOLVED: To provide a high strength Al alloy tube material for heat exchanger, having high strength, capable of thinning, and excellent in pitting corrosion resistance. SOLUTION: This material is an Al alloy tube material for heat exchanger, prepared by cladding the inside of the main body of tube material composed of Al alloy with a sacrificial anode material composed of Al alloy and also cladding the outside of the main body with a brazing filler metal composed of Al-Si alloy or Al-Si-Mg alloy. At this time, the main body of the tube material is composed of an Al alloy having a composition consisting of, by weight, 0.8-1.5% Mn, 0.5-1.2% Si, 0.05-0.25% Zr, 0.05-0.25% Ti, and the balance Al with inevitable impurities. Further, the sacrificial anode material is composed of an Al alloy having a composition consisting of 0.05-0.2% Sn, 0.4-0.7% Fe, 1.3-2% Mg, and the balance Al with inevitable impurities. |
