Multi-layered Aluminium Brazing Sheet Material

A multi-layered brazing sheet material consisting of an aluminium core alloy layer provided with a brazing clad layer material on one face of said aluminium core alloy layer, an inter-layer positioned between the aluminium core alloy layer and the brazing clad layer material, and a water-side layer on an other face of the aluminium core layer,

• wherein the aluminium core alloy layer is made from an aluminium alloy having, in wt. %, up to 0.6% Si, up to 0.45% Fe, 0.6% to 1.25% Cu, 0.6% to 1.4% Mn, 0.08% to 0.4% Mg, up to 0.2% Cr, up to 0.25% Zr, up to 0.25% Ti, up to 0.3% Zn, balance aluminium and impurities,
• wherein the brazing layer is made from an aluminium alloy having 6% to 14% Si and up to 2% Mg, balance aluminium and impurities,
• wherein the inter-layer is made from an aluminium alloy of the 1xxx-series alloys, and
• wherein the waterside layer is made from a 3xxx-series aluminium alloy having 0.5% to 1.8% Mn and 1% to 3.5% Zn.