| 摘要 |
PURPOSE:To provide a titled fin material which obviates decrease in the strength of a brazed joint and has excellent strength and workability by consisting the material of an Al alloy which consists of specifically composed Mn, Cu, Mg, Si and Al and is limited in the content of Fe in impurities. CONSTITUTION:The fin material of a plate fin type heat exchanger for ultra- high pressure to be produced by brazing is formed by consisting the same of the aluminum alloy which contains 0.6-1.5% Mn, 0.1-1.0% Cu, 0.1-0.75% Mg and 0.05-0.30% Si, contains further 1 kinds among 0.05-0.25% Zr, 0.01-0.25% Ti, 0.05-0.25% Cr and 0.01-0.25% V, consists of the balance substantially Al and is limited in particularly Fe in impurities to <=0.8%. The overdiffusion of Si in the brazing material to the fin owing to long-time heating during brazing is thus prevented. The fin material which obviates decrease in the strength of the brazed joint and has high strength and good workability is obtd.
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