Brazing sheet having increased silicon content in aluminium...

Details Brazing sheet having increased silicon content in aluminium... Brazing sheet having increased silicon content in aluminium...

B - Operations, Transporting

23

K

B23K 35/28 (2006.01) B32B 15/01 (2006.01) C21D 8/00 (2006.01) B23K 35/02 (2006.01)

Patent

CA 2165408

Brazing sheet having a core sheet made of an aluminium alloy core material and on at least one side thereof a brazing layer of an aluminium alloy containing silicon as main alloying element, wherein the aluminium alloy of the core sheet has the composition (in weight %) Mn 0.7 - 1.5 Cu 0.2 - 2.0 Mg 0.1 - 0.6 Si > 0.15 Fe up to 0.8 Ti optional, up to 0.15 Cr optional, up to 0.35 Zr and/or V optional, up to 0.25 in total balance Al and unavoidable impurities, with the proviso that (Cu + Mg) > 0.7. This brazing sheet achieves improved post-brazed strength properties by ageing, e.g. 0.2 % yield strength of at least 70 MPa, and has at the same time a good post-brazed, corrosion resistance as determined in a SWAAT (ASTM G85) corrosion test.

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