HIGH-STRENGTH ALUMINUM ALLOY FIN MATERIAL AND PRODUCTION METHOD THEREOF

WIPO Patent Application WO/2014/034212

A1

Provided are: an aluminum alloy fin material for heat exchangers, said aluminum alloy fin material having a small thickness of 35-50 μm, undergoing little springback in corrugating, having such a pre-brazing strength as to facilitate fin-shaping, having a high post-brazing strength, having excellent errosion resistance and excellent self corrosion resistance, and showing an excellent sacrificial anode effect; and a production method thereof. The fin material comprising, in terms of mass%, 0.9-1.2% of Si, 0.8-1.1% of Fe, 1.1-1.4% of Mn, 0.9-1.1% of Zn, together with, as impurities, not more than 0.05% of Mg and not more than 0.03% of Cu, and the balance being inevitable impurities and Al; ([Si]+[Fe]+2[Mn])/3 being restricted to 1.4-1.6%; the sheet thickness being 35-50 μm; the pre-brazing tensile strength being not higher than 215 MPa; the solidus temperature being 620oC or higher; the post-brazing tensile strength being 140 MPa or higher; the post-brazing electrical conductivity being 45% IACS or higher; and the post-brazing spontaneous potential being -730 to -760 mV. In the production method, steps for hot rolling, cold rolling, intermediate annealing and final cold rolling are respectively specified.

KOKUBO TAKANORI (JP)
ANAMI TOSHIYA (JP)
TERAMOTO HAYAKI (JP)
OTA HIDEYUKI (JP)
NINAGAWA TOSHIHIDE (JP)

PCT/JP2013/065468

March 06, 2014

June 04, 2013

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DENSO CORP (JP)
NIPPON LIGHT METAL CO (JP)
NOVELIS INC (US)

C22C21/00; B21B1/46; B21B3/00; B22D11/00; B22D11/06; C22F1/04; F28F21/08; C22F1/00

JP2005220375A	2005-08-18
JP2008038166A	2008-02-21
JP2002256402A	2002-09-11

AOKI, Atsushi et al. (JP)
Aoki 篤 (JP)

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