Process by producing an aluminium alloy brazing sheet,...

Details Process by producing an aluminium alloy brazing sheet,... Process by producing an aluminium alloy brazing sheet,...

2005-05-25

2008-08-05

Zimmerman, John J (Department: 1794)

Stock material or miscellaneous articles

All metal or with adjacent metals

Composite; i.e., plural, adjacent, spatially distinct metal...

C148S437000, C148S439000, C148S535000, C420S535000, C228S262500, C165S905000

Reexamination Certificate

active

07407714

ABSTRACT:
Disclosed is a process for producing an Al—Mn alloy sheet with improved liquid film migration resistance when used as core alloy in brazing sheet, including the steps of: casting an ingot having a composition comprising (in weight percent): 0.5<Mn≦1.7, 0.06<Cu≦1.5, Si≦1.3, Mg≦0.25, Ti<0.2, Zn≦2.0, Fe≦0.5, at least one element of the group of elements of 0.05<Zr≦0.25 and 0.05<Cr≦0.25; other elements <0.05 each and total <0.20, balance Al; homogenisation and preheat; hot rolling; cold rolling (including intermediate anneals whenever required), and wherein the homogenisation temperature is at least 450° C. for a duration of at least 1 hour followed by an air cooling at a rate of at least 20° C./h and wherein the pre-heat temperature is at least 400° C. for at least 0.5 hour.

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M. Nylén et al., “The Mechanism of Braze Metal Penetration by Migration of Liquid Films in Aluminum”, Material Science Forum, Trans Tech Publications, No. 331-337, 2000, pp. 1737-1742, XP008043730 Switzerland the whole document.
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