# US 10,309,001 B2 · Aluminum alloy for microporous hollow material which has excellent extrudability and grain boundary corrosion resistance, and method for producing same

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- Number: US 10,309,001 B2
- Document ID: US10309001B2
- Status: Granted
- Kind: B2
- Application number: 14/390,515
- Filed: 2013-03-28
- Published: 2015-06-18
- Granted: 2019-06-04
- Earliest claimed: 2012-04-05
- Assignees: Nippon Light Metal Company, Ltd.; Okb Co., Ltd.
- Applicants: Nippon Light Metal Company, Ltd.; Okb Co., Ltd.
- Inventors: Shigeru Okaniwa; Meitoku Ogasawara; Takao Otaki; Yusuke Seki; Yutaka Kato
- Web page: https://patentgrep.com/patent/US10309001B2

## CPC

- C22F 1/057: of alloys with copper as the next major constituent
- B32B 15/016: {all layers being formed of aluminium or aluminium alloys}
- C22C 21/00: Alloys based on aluminium
- C22C 21/12: with copper as the next major constituent
- C22C 21/14: with silicon
- C22F 1/00: Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working (apparatus for mechanical working of metal B21, B23, B24)
- C22F 1/04: of aluminium or alloys based thereon
- F28F 21/084: {from aluminium or aluminium alloys}
- F28D 1/05383: {with multiple rows of conduits or with multi-channel conduits (F28D1/05391 takes precedence)}
- F28F 1/022: {with multiple channels}
- F28F 1/126: {consisting of zig-zag shaped fins (F28F1/105 takes precedence)}
- F28F 2255/16: extruded
- C22F: CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS (surface treatment of metallic material involving at least one process provided for in class C23 and at least one process covered by this subclass, C23F17/00)
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- C22C: ALLOYS (treatment of alloys C21D, C22F)
- F28F: DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION (water and air traps, air venting F16)
- F28D: HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT (fluid heaters having heat generating means and heat transferring means F24H; furnaces F27; details of heat-exchange apparatus of general)

## Abstract

An aluminum alloy for microporous hollow shape material use constituted by an aluminum alloy which has excellent corrosion resistance and extrudability which keeps down the content of Cu which poses a problem in intergranular corrosion resistance, which maintains the natural potential noble, which adds transition metals which do not obstruct the extrudability is provided, that is, an aluminum alloy which has a chemical composition which contains, by mass %, Fe: 0.05 to 0.20%, Si: 0.10% or less, Cu: 0.15 to 0.32%, Mn: 0.08 to 0.15%, Zr: 0.05% or less, Ti: 0.06 to 0.15%, Cr: 0.03% or less, and balance: Al and unavoidable impurities and has an amount of gas in the alloy billet of 0.25 cc/100 g or less, and a method of production of an aluminum alloy which, produces a DC cast billet.

## Claims

### Claim 1

An aluminum alloy having a chemical composition consisting, by mass %, of Fe: 0.05 to 0.20%, Si: 0.10% or less, Cu: 0.15 to 0.32%, Mn: 0.08 to 0.10%, Zr: 0.02 to 0.03%, Ti: 0.06 to 0.15%, Cr: 0.01 to 0.03%, and the balance: Al and unavoidable impurities; wherein said aluminum alloy is cast into a billet and having a gas content in the alloy billet of 0.25 cc/100 g or less, wherein the aluminum alloy has a strength over 90 MPa when measured at room temperature.

### Claim 2 (depends on 1)

A method for producing an aluminum alloy comprising: thermal homogenization by heating a DC cast billet of an aluminum alloy which has a chemical composition as set forth in claim 1 at a speed of 80° C./hour or less to 550 to 590° C., holding it there for 0.5 to 6 hours, then either holding it at 450 to 350° C. in range for 0.5 to 1 hour or cooling at a cooling rate of 50° C./hour down to 200° C. or less.

### Claim 3 (depends on 2)

A method for producing an aluminum alloy according to claim 2, comprising: reheating said homogenization-treated billet to 450 to 550° C.; and then extruding it to a predetermined shape at an extrusion ratio of 30 to 1000.

### Claim 4 (depends on 3)

A method for producing an aluminum alloy according to claim 3, further comprising: surface machining said homogenization-treated billet to a depth of about 0.1 to 1 mm in terms of the outer diameter; and then performing said extrusion.

### Claim 5 (depends on 1)

The aluminum alloy according to claim 1, which contains Fe: in an amount of 0.05%.

### Claim 6 (depends on 5)

A method for producing an aluminum alloy comprising: thermal homogenization by heating a DC cast billet of an aluminum alloy which has a chemical composition as set forth in claim 5 at a speed of 80° C./hour or less to 550 to 590° C., holding it there for 0.5 to 6 hours, then either holding it at 450 to 350° C. in range for 0.5 to 1 hour or cooling at a cooling rate of 50° C./hour down to 200° C. or less.

### Claim 7 (depends on 6)

A method for producing an aluminum alloy according to claim 6, comprising: reheating said homogenization-treated billet to 450 to 550° C.; and then extruding it to a predetermined shape at an extrusion ratio of 30 to 1000.

### Claim 8 (depends on 7)

A method for producing an aluminum alloy according to claim 7, further comprising: surface machining said homogenization-treated billet to a depth of about 0.1 to 1 mm in terms of the outer diameter; and then performing said extrusion.

### Claim 9 (depends on 1)

The aluminum alloy according to claim 1, wherein the aluminum alloy is obtained by heating the alloy billet at a speed of 80° C./hour or less to 550 to 590° C., holding it there for 0.5 to 6 hours, then either holding it at 450 to 350° C. in range for 0.5 to 1 hour or cooling at a cooling rate of 50° C./hour down to 200° C. or less.

### Claim 10 (depends on 1)

The aluminum alloy according to claim 1, wherein the gas content in the alloy billet is 0.23 cc/100 g or less.

### Claim 11

An aluminum alloy having a chemical composition consisting, by mass %, of Fe: 0.05 to 0.20%, Si: 0.10% or less, Cu: 0.15 to 0.32%, Mn: 0.08 to 0.10%, Zr: 0.02 to 0.03%, Ti: 0.06 to 0.15%, Cr: 0.01 to 0.03%, V: more than 0 to less than 0.05%, and the balance: Al and unavoidable impurities; wherein said aluminum alloy is cast into a billet and having a gas content in the alloy billet of 0.25 cc/100 g or less, and an upper limit of the total amount of Ti and V is 0.20%.

### Claim 12 (depends on 11)

The aluminum alloy according to claim 11, which contains Fe: in an amount of 0.05%.

### Claim 13 (depends on 11)

A method for producing an aluminum alloy comprising: thermal homogenization by heating a DC cast billet of an aluminum alloy which has a chemical composition as set forth in claim 11 at a speed of 80° C./hour or less to 550 to 590° C., holding it there for 0.5 to 6 hours, then either holding it at 450 to 350° C. in range for 0.5 to 1 hour or cooling at a cooling rate of 50° C./hour down to 200° C. or less.

### Claim 14 (depends on 13)

A method for producing an aluminum alloy according to claim 13, comprising: reheating said homogenization-treated billet to 450 to 550° C.; and then extruding it to a predetermined shape at an extrusion ratio of 30 to 1000.

### Claim 15 (depends on 14)

A method for producing an aluminum alloy according to claim 14, further comprising: surface machining said homogenization-treated billet to a depth of about 0.1 to 1 mm in terms of the outer diameter; and then performing said extrusion.

### Claim 16 (depends on 11)

The aluminum alloy according to claim 11, wherein the aluminum alloy has a strength over 90 MPa when measured at room temperature.

### Claim 17 (depends on 11)

The aluminum alloy according to claim 11, wherein the aluminum alloy has an exfoliation corrosion of 100 μm or less.

### Claim 18

An aluminum alloy having a chemical composition consisting, by mass %, of Fe: 0.05 to 0.20%, Si: 0.10% or less, Cu: 0.15 to 0.32%, Mn: 0.08 to 0.10%, Zr: 0.02 to 0.03%, Ti: 0.06 to 0.15%, Cr: 0.01 to 0.03%, and the balance: Al and unavoidable impurities; wherein said aluminum alloy is cast into a billet and having a gas content in the alloy billet of 0.25 cc/100 g or less wherein the aluminum alloy has an exfoliation corrosion of 100 μm or less.

### Claim 19 (depends on 18)

The aluminum alloy according to claim 18, wherein the aluminum alloy has a strength over 90 MPa when measured at room temperature.

### Claim 20 (depends on 18)

The aluminum alloy according to claim 18, wherein the gas content in the alloy billet is 0.23 cc/100 g or less.