THIN-WALLED BRAZING SHEET FIN MATERIAL FOR HIGH-TEMPERATURE BRAZING, AND METHOD FOR MANUFACTURING HEAT EXCHANGER USING THE SAME

摘要

PPROBLEM TO BE SOLVED: To provide a brazing sheet fin material capable of preventing occurrence of any leaning deformation of a fin end even when performing the brazing at high temperature exceeding 610C by using a thin-walled brazing sheet fin material having the sheet thickness of 85 m. PSOLUTION: A core is formed of an Al-Mn alloy having the composition composed of, by mass, 0.7-1.5% Mn, 0.3-0.8% Si, 0.05-0.75% Fe, and the balance substantially Al. As brazing filler metals joined to both sides of the core, an Al-Si alloy containing 5.5-8.0% Si is used. The single side mean clad ratio of the brazing filler metal is 6.0-9.8%, and the relationship between the Si amount (Sif) of the brazing filler metal and the single side mean clad ratio (CR) of the brazing filler metal satisfies inequality Q=Sif(mass%)CR(%)67. PCOPYRIGHT: (C)2010,JPO&INPIT