ALUMINUM BRAZING SHEET FOR HEAT EXCHANGER, EXCELLENT IN CORROSION RESISTANCE AND CLADDING ROLLABILITY

摘要

PROBLEM TO BE SOLVED: To provide an aluminum brazing sheet excellent in corrosion resistance and cladding rollability, suitable for use as a fluid passage component material for a heat exchanger made of aluminum alloy for automobile use and particularly suitable for use as a core plate material for a drawn-cup-type heat exchanger. SOLUTION: This brazing sheet material is a four-layer clad material prepared by cladding one side of a core material with an intermediate material and further cladding the intermediate material and the other side of the core material with an Al-Si-Mg type brazing filler metal, respectively. The core material is constituted of an aluminum alloy having a composition consisting of 0.5-1.6% Mn, 0.15-0.35% Cu, 0.05-0.70% Mg, 0.06-0.30% Ti, and the balance Al with inevitable impurities. The intermediate material is constituted of an aluminum alloy having a composition consisting of 0.3-1.5% Mg and the balance Al with inevitable impurities and also having a deformation resistance 70-130% of the deformation resistance of the core material. Further, the thickness of the intermediate material in the four-layer clad brazing sheet material is regulated to 30-150μm.