Granted Patent B2

US 9,719,156 · App. 13/708,644 · Granted Aug 1, 2017

Abstract

Claims (70)

1. An aluminum alloy finstock consisting of the following composition in weight %:

Fe

 0.8-1.25;

Si

 0.8-1.25;

Mn

0.70-1.50;

Cu

0.05-0.50;

Zn

up to 2.5;

and balance aluminum, wherein the aluminum alloy finstock possesses a longitudinal UTS≧140 MPa and a conductivity≧46% IACS after brazing at 600° C., wherein a gauge of the aluminum alloy finstock is <0.07 mm.

2. The aluminum alloy finstock of claim 1 , wherein the Si content is 0.9-1.1 weight %.

3. The aluminum alloy finstock of claim 1 , wherein the Mn content is 0.9-1.1 weight %.

4. The aluminum alloy finstock of claim 1 , wherein the Zn content is 0.25-2.5 weight %.

5. The aluminum alloy finstock of claim 4 , wherein the aluminum alloy finstock possesses a conductivity>48% IACS after brazing.

6. The aluminum alloy finstock of claim 1 , wherein the Fe content is 0.9-1.1 weight %.

7. The aluminum alloy finstock of claim 1 , wherein the Mn content is 0.7-1 weight %.

8. The aluminum alloy finstock of claim 1 , wherein the gauge of the aluminum alloy finstock is <0.06 mm.

9. The aluminum alloy finstock of claim 1 , wherein the gauge of the aluminum alloy finstock is <0.055 mm.

10. The aluminum alloy finstock of claim 1 , wherein an average grain size of the aluminum alloy finstock after brazing is >110 μm.

11. The aluminum alloy finstock of claim 1 , wherein an average grain size of the aluminum alloy finstock after brazing is >240 μm.

12. A method of making aluminum alloy finstock comprising the following steps:

a) continuously casting an aluminum alloy melt consisting of the following composition in weight %:

Fe

 0.9-1.25;

Si

 0.8-1.25;

Mn

 0.7-1.5;

Cu

0.05-0.5;

Zn

up to 2.5;

and balance aluminum;

b) hot rolling the continuously cast sheet;

c) interannealing the hot rolled sheet; and

d) cold rolling the sheet to a foil gauge, wherein the aluminum alloy finstock possesses a longitudinal UTS≧140 MPa and a conductivity≧46% IACS after brazing at 600° C., wherein the foil gauge is <0.07 mm.

13. The method of claim 12 , wherein the continuous casting step a) is a twin roll casting process.

14. The method of claim 12 , wherein the foil gauge is <0.06 mm.

15. The method of claim 12 , wherein the foil gauge is <0.055 mm.

16. An aluminum alloy finstock consisting of the following composition in weight %:

Fe

 0.9-1.25;

Si

 0.8-1.25;

Mn

 0.7-1.5;

Cu

0.05-0.5;

Zn

up to 2.5;

and balance aluminum,

wherein the aluminum alloy finstock is produced by a method comprising casting an aluminum alloy melt comprising the composition of the aluminum alloy finstock by a continuous strip casting process, wherein a gauge of the aluminum alloy finstock is <0.07 mm, and

wherein the continuous strip casting process is twin roll casting with an average cooling rate not exceeding 1500° C./sec or belt and block casting with a maximum average cooling rate of less than 250° C./sec.

17. The aluminum alloy finstock of claim 16 , wherein the continuous strip casting process is the twin roll casting with the average cooling rate greater than 200° C./sec.

18. An aluminum alloy finstock comprising the following composition in weight %:

Fe

 0.8-1.25;

Si

 0.8-1.25;

Mn

 0.7-1.5;

Cu

0.05-0.5;

Zn

up to 2.5;

other elements less than or equal to 0.05 each and less than or equal to 0.15 in total; and balance aluminum,

wherein the content of Fe and Si are approximately equal; and

wherein the aluminum alloy finstock possesses a longitudinal UTS≧140 MPa and a conductivity≧46% IACS after brazing at 600° CU, and wherein a gauge of the aluminum alloy finstock is <0.07 mm.

Assignments (19)