# US 11,305,512 B2 · Roll-bonded laminate and method for producing the same

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- Number: US 11,305,512 B2
- Document ID: US11305512B2
- Status: Granted
- Kind: B2
- Application number: 16/498,946
- Filed: 2018-03-29
- Published: 2021-04-15
- Granted: 2022-04-19
- Earliest claimed: 2017-03-29
- Assignees: Toyo Kohan Co., Ltd.
- Applicants: Toyo Kohan Co., Ltd.
- Inventors: Kota Sadaki; Takashi Koshiro; Takafumi Hatakeda
- Web page: https://patentgrep.com/patent/US11305512B2

## CPC

- B32B 15/012: {one layer being formed of an iron alloy or steel, another layer being formed of aluminium or an aluminium alloy}
- B21B 1/22: for rolling {plates, strips,} bands or sheets of indefinite length (B21B1/42 takes precedence)
- B23K 20/04: by means of a rolling mill
- B32B 15/01: all layers being exclusively metallic {(making layered metal workpieces by pressure cladding B23K20/22; making coatings with a metallic material characterised by its composition C23C30/00)}
- B32B 37/10: characterised by the pressing technique, e.g. using action of vacuum or fluid pressure
- B32B 38/0036: {Heat treatment (for heating or cooling of layers during lamination B32B37/06, B32B37/08)}
- C21D 1/26: Methods of annealing
- C21D 9/00: Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D 9/0012: {Rolls; Roll arrangements}
- C22C 21/00: Alloys based on aluminium
- C22C 21/06: with magnesium as the next major constituent
- C22F 1/04: of aluminium or alloys based thereon
- B23K 2103/20: Ferrous alloys and aluminium or alloys thereof
- B32B 37/0015: {to avoid warp or curl}
- B32B 2038/0048: {Annealing, relaxing}
- B32B 2307/54: Yield strength; Tensile strength
- B32B 2307/732: Dimensional properties
- B32B 2311/18: Titanium
- B32B 2311/24: Aluminium
- B32B 2311/30: Iron, e.g. steel
- 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)
- Y10T 428/12757: Fe
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B21B: ROLLING OF METAL (auxiliary operations used in connection with metal-working operations covered in B21, see B21C; bending by rolling B21D; manufacture of particular objects, e.g. screws, wheels, rings, barrels, balls, by rolling B21H; pressure welding by means of a rolling mill B23K20/04)
- B23K: SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- C21D: MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING (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; unidirectional solidification of eutectic materials or unidirectional demixing of eutectoid materials C30B)
- C22C: ALLOYS (treatment of alloys C21D, C22F)
- 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)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

This invention provides a roll-bonded laminate that is excellent in press workability and/or a roll-bonded laminate with improved performance and ease of handling at the time of production. More specifically, this invention relates to a roll-bonded laminate composed of a stainless steel layer and an aluminum alloy layer with the peel strength of 60 N/20 mm or higher, a roll-bonded laminate composed of a stainless steel layer and a pure aluminum layer with the peel strength of 160 N/20 mm or higher, and a roll-bonded laminate composed of a pure titanium or titanium alloy layer and an aluminum alloy layer with the peel strength of 40 N/20 mm or higher.

## Claims

### Claim 1

A roll-bonded laminate, comprising:
a stainless steel layer and an aluminum alloy layer,
wherein the aluminum alloy layer contains one or more additive metal elements selected from Mg, Mn, Si, and Cu, the total content of the additive metal elements exceeds 1% by mass, and a peel strength of the roll-bonded laminate is 60 N/20 mm or higher;
wherein the aluminum alloy layer has a thickness of 0.01 mm to 2.5 mm;
wherein a reduction ratio of the aluminum alloy layer is 5% or higher, and a reduction ratio of the roll-bonded laminate is 15% or lower; and
wherein the roll-bonded laminate is batch annealed at 200° C. to 370° C., or continuously annealed at 300° C. to 800° C.

### Claim 2 (depends on 1)

The roll-bonded laminate according to claim 1, wherein elongation measured by a tensile test is 35% or higher.

### Claim 3 (depends on 2)

The roll-bonded laminate according to claim 2, wherein tensile strength measured by a tensile test with the use of Specimens No. 6 specified by JIS Z 2201 is 3,000 N or higher.

### Claim 4 (depends on 1)

The roll-bonded laminate according to claim 1, wherein a limiting drawing ratio is 1.20 or higher.

### Claim 5 (depends on 1)

The roll-bonded laminate according to claim 1, wherein a standard deviation of thickness of the stainless steel layer is 2.0 μm or lower.

### Claim 6 (depends on 1)

The roll-bonded laminate according to claim 1, wherein the aluminum alloy layer has a thickness larger than a thickness of the stainless steel layer.

### Claim 7 (depends on 1)

The roll-bonded laminate according to claim 1, wherein the aluminum alloy layer contains Mg in an amount of 0.3% by mass or more.

### Claim 8 (depends on 1)

The roll-bonded laminate according to claim 1, wherein the aluminum alloy layer has a thickness of more than 0.5 mm to 2.5 mm or less.

### Claim 9

A method for producing a roll-bonded laminate, comprising:
subjecting a surface of a stainless steel plate and a surface of an aluminum alloy plate to be bonded to each other to sputter etching, wherein the aluminum alloy plate contains one or more additive metal elements selected from Mg, Mn, Si, and Cu, the total content of the additive metal elements exceeds 1% by mass, and a peel strength of the roll-bonded laminate is 60 N/20 mm or higher, and wherein the aluminum alloy plate has a thickness of 0.01 mm to 2.5 mm;
pressure bonding the surfaces subjected to sputter etching to each other at a reduction ratio of the aluminum alloy plate of 5% or higher and a reduction ratio of the roll-bonded laminate of 15% or lower; and
performing batch annealing at 200° C. to 370° C. or continuous annealing at 300° C. to 800° C.