Patent ID: 8763880

Claim:
A brazing sheet material comprising of a core alloy layer bonded on at least one side with an aluminium brazing clad layer or layers forming a filler material of a 4000-series aluminium alloy, wherein the core layer is made from an aluminium alloy comprising, in wt. %: Mg 2.0 to 3.0 Mn 0 to 1.8 Cu 0 to 0.1 Si 0 to 0.7 Fe 0 to 0.7, optionally one or more elements selected from the group consisting of: Zr 0.04 to 0.4, Cr 0.04 to 0.4, Hf 0.04 to 0.4, and Ti 0.01 to 0.3, Zn 0 to 0.5, unavoidable impurities and balance aluminium, and wherein the filler material comprises, in wt. %: Si 6 to 14 Mg 0.02 to 0.5 Bi 0.05 to 0.5 Fe 0 to 0.8 Zn 0 to 0.4 Mn 0 to 0.3 Cu 0 to 0.3 Ti 0 to 0.2, unavoidable impurities and balance aluminium.