US2004086417A1PendingUtilityA1
High conductivity bare aluminum finstock and related process
Priority: Aug 1, 2002Filed: Aug 1, 2003Published: May 6, 2004
Est. expiryAug 1, 2022(expired)· nominal 20-yr term from priority
C22C 21/00C22F 1/04C22C 21/10
49
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Claims
Abstract
A process for making aluminum alloy finstock having improved combinations of post-braze tensile strength, electrical conductivity and self-corrosion resistance. The process includes continuously casting into sheet an alloy composition. The composition includes about 0.35-0.60 wt. % Si, about 1.8-2.6 wt. % Fe, about 0.02-0.30 wt. % Cu, about 0.40-0.70 wt. % Mn, up to about 3.0 wt. % Zn, up to about 0.05 wt. % In; up to about 0.05 wt. % Ti and up to about 0.2 wt. % Zr, the balance aluminum, incidental elements and impurities. The casting including a solidification rate of greater than about 200° C./sec. The sheet is then rolled to an intermediate anneal gauge and then annealed. The sheet is then cold rolled to a desired final gauge.
Claims
exact text as granted — not AI-modifiedWhat is claimed is:
1 . An aluminum alloy comprising: about 0.35-0.60 wt. % Si, about 1.8-2.6 wt. % Fe, about 0.02-0.30 wt. % Cu, about 0.40-0.70 wt. % Mn, up to about 3.0 wt. % Zn, up to about 0.05 wt. % In, and up to about 0.05 wt. % Ti, the balance aluminum, incidental elements and impurities.
2 . The aluminum alloy of claim 1 , which further contains up to about 0.2 wt. % Zr.
3 . The aluminum alloy of claim 1 , which further contains up to about 0.3 wt. % Mg.
4 . The aluminum alloy of claim 2 , which further contains up to about 0.3 wt. % Mg.
5 . The aluminum alloy of claim 1 , which contains about 0.35-0.50 wt. % Si and about 1.8-2.4 wt. % Fe.
6 . The aluminum alloy of claim 1 , which contains about 0.35-0.45 wt. % Si.
7 . The aluminum alloy of claim 1 , which contains about 0.10-0.25 wt. % Cu.
8 . The aluminum alloy of claim 1 , which contains about 0.35-0.45 wt. % Si, about 1.8-2.4 wt. % Fe, about 0.4-0.7 wt. % Mn, about 0.15-0.25 wt. % Cu, up to about 1.5 wt. % Zn and about up to 0.03 wt. % In.
9 . A process for making aluminum alloy finstock having improved combinations of post-braze tensile strength, electrical conductivity and self-corrosion resistance, said process comprising the steps of:
(a) continuously casting into sheet an alloy composition comprising: about 0.35-0.60 wt. % Si, about 1.8-2.6 wt. % Fe, about 0.02-0.30 wt. % Cu, about 0.40-0.70 wt. % Mn, up to about 3.0 wt. % Zn, up to about 0.05 wt. % In; up to about 0.05 wt. % Ti and up to about 0.2 wt. % Zr, the balance aluminum, incidental elements and impurities, said casting including a solidification rate of greater than about 200° C./sec. to substantially avoid formation of primary intermetallic solidification compound; (b) rolling said sheet to an intermediate anneal gauge; (c) annealing the rolled sheet; and (d) cold rolling to final gauge.
10 . The process of claim 9 , wherein the alloy contains about 0.35-0.50 wt. % Si and about 1.8-2.4 wt. % Fe.
11 . The process of claim 9 , wherein the alloy contains about 0.35-0.45 wt. % Si.
12 . The process of claim 9 , wherein the alloy contains about 0.10-0.25 wt. % Cu.
13 . The aluminum alloy of claim 9 , wherein the alloy contains about 0.35-0.45 wt. % Si, about 1.8-2.4 wt. % Fe, about 0.4-0.7 wt. % Mn, about 0.15-0.25 wt. % Cu, up to about 1.5 wt. % Zn and about up to 0.03 wt. % In.
14 . The process of claim 9 , wherein step (a) is performed with a twin roll caster under rapidly cooling casting conditions that substantially avoid the formation of primary intermetallic solidification compounds and produces a sheet of thickness of about 2.0-10.0 mm.
15 . The process of claim 9 , wherein step (b) includes an initial intermediate thermal operation either at cast gauge or after some initial cold reduction.
16 . The process of claim 15 , wherein said intermediate thermal operation includes a 1-8 hour soak in a temperature range of about 320-450° C.
17 . The process of claim 9 , wherein step (b) comprises cold rolling.
18 . The process of claim 9 , wherein step (a) is performed with a high speed sheet or belt caster that freezes from at least one surface.
19 . The process of claim 18 , wherein step (b) includes both hot or warm rolling and cold rolling.
20 . The process of claim 9 , wherein said finstock has a post-braze ultimate tensile strength of about 125 Mpa or higher and an electrical conductivity value of about 48% IACS or greater.
21 . The process of claim 9 , wherein step (c) is performed at one or more temperatures below about 450° C.
22 . The process of claim 9 , wherein step (d) produces less than or equal to about a 50% reduction in sheet thickness.
23 . A heat exchanger fabricated from finstock made from an aluminum alloy consisting essentially of: about 0.35-0.60 wt. % Si, about 1.8-2.6 wt. % Fe, about 0.02-0.30 wt. % Cu, about 0.40-0.70 wt. % Mn, up to about 3.0 wt. % Zn, up to about 0.05 wt. % In; up to about 0.05 wt. % Ti, up to about 0.2 wt. % Zr, and up to about 0.3 wt. % Mg, the balance aluminum, incidental elements and impurities.
24 . The heat exchanger of claim 23 , wherein the aluminum alloy contains about 0.35-0.50 wt. % Si and about 1.8-2.4 wt. % Fe.
25 . The heat exchanger of claim 23 , wherein the aluminum alloy contains about 0.35-0.45 wt. % Si.
26 . The heat exchanger of claim 23 , wherein the aluminum alloy contains about 0.10-0.25 wt. % Cu.
27 . The heat exchanger of claim 23 , wherein the aluminum alloy contains about 0.35-0.45 wt. % Si, about 1.8-2.4 wt. % Fe, about 0.4-0.7 wt. % Mn, about 0.10-0.25 wt. % Cu, up to about 1.5 wt. % Zn and about up to 0.03 wt. % In.
28 . The heat exchanger of claim 23 , wherein the aluminum alloy is of a gauge thickness about 75 microns or less.Join the waitlist — get patent alerts
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