US2004182482A1PendingUtilityA1
DC cast Al alloy
Priority: Mar 22, 2001Filed: Mar 18, 2002Published: Sep 23, 2004
Est. expiryMar 22, 2021(expired)· nominal 20-yr term from priority
C22C 21/00C22F 1/04
37
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Claims
Abstract
There is disclosed a DC cast alloy of composition (in wt %): Fe 0.8-1.5 Si 0.7-0.95 Mn 0.2-0.5 Zn 0.2-0.8 Mg up to 0.2 Cu up to 0.2 Ti<0.1 B<0.01 C<0.01. Unavoidable impurities up to 0.05 each, 0.15 total AI balance. Also disclosed is a method of DC casting the alloy to form an ingot.
Claims
exact text as granted — not AI-modified1 . A DC cast alloy of composition (in wt %):
Fe
0.8-1.5
Si
0.7-0.95
Mn
0.2-0.5
Zn
0.2-0.8
Mg
up to 0.2
Cu
up to 0.2
Ti
<0.1
B
<0.01
C
<0.01
Unavoidable impurities up to 0.05 each, 0.15 total
Al
balance.
2 . An alloy of claim 1 , wherein Cu is present in the range 0.05-0.2.
3 . An alloy of claim 1 or 2 , wherein Cu is present in the range 0.1-0.15.
4 . An alloy according to claim 1 , wherein Mg is present in the range 0.05-0.2.
5 . An alloy according to claim 1 , wherein Mg is present in the range 0.1-0.15.
6 . An alloy according to claim 1 , wherein Fe is present in the range 0.8-1.4.
7 . A DC cast aluminium alloy finstock having a composition (in wt %):
Fe
0.8-1.5
Si
0.7-0.95
Mn
0.2-0.5
Zn
0.2-0.8
Mg
up to 0.2
Cu
up to 0.2
Ti
<0.1
B
<0.01
C
<0.01
Unavoidable impurities up to 0.05 each, 0.15 total
Al
balance.
8 . An aluminium alloy finstock according to claim 7 , having a conductivity after brazing of at least 46% IACS.
9 . A brazed heat exchanger having fins of the alloy of claim 1 .
10 . A method of producing an ingot from an alloy of composition (in wt %):
Fe
0.8-1.5
Si
0.7-0.95
Mn
0.2-0.5
Zn
0.2-0.8
Mg
up to 0.2
Cu
up to 0.2
Ti
<0.1
B
<0.01
C
<0.01
Unavoidable impurities up to 0.05 each, 0.15 total
Al
balance,
which method comprises DC casting the alloy to form an
ingot.
11 . A method according to claim 10 , further comprising the steps of heating or homogenising the DC cast ingot, hot rolling, cold rolling, and annealing or interannealing.
12 . A method according to claim 11 , further comprising the step of cold rolling after the interannealing step.
13 . A method according to claim 12 , wherein the thickness reduction during the step of cold rolling after interannealing is between 25 and 45%.
14 . A method according to claim 11 , wherein the homogenising step is a two-stage homogenisation comprising heating the ingot to 580-620° C., holding for up to 8 hours, cooling to 460-500° C. and holding for up to 8 hours.
15 . A method according to claim 11 , wherein the heating step comprises heating to 460-540° C. and holding for up to 8 hours.
16 . A method according to claim 11 , wherein the annealing or interannealing step is a single stage process comprising heating at 250-450° C.
17 . A method according to claim 11 , wherein the annealing or interannealing step is a two-stage process comprising heating at 300-500° C. and cooling to 200-350° C.
18 . A method according to claim 11 , further comprising the step of brazing, wherein the particle size of the intermetallics and dispersoids present in the rolled product is sufficiently large such that the reduction in IACS is less than 5% units during brazing.
19 . A method of producing an aluminium alloy finstock from an alloy comprising (in wt %):
Fe
0.8-1.5
Si
0.7-0.95
Mn
0.2-0.5
Zn
0.2-0.8
Mg
up to 0.2
Cu
up to 0.2
Ti
<0.1
B
<0.01
C
<0.01
Unavoidable impurities up to 0.05 each, 0.15 total
Al
balance,
which method comprises DC casting the alloy, heating
or homogenising, hot rolling, cold rolling and annealing or
interannealing.Join the waitlist — get patent alerts
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