# US 12,000,026 B2 · Aluminum alloy sheet for automotive structural member, automotive structural member, and method for manufacturing aluminum alloy sheet for automotive structural member

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- Number: US 12,000,026 B2
- Document ID: US12000026B2
- Status: Granted
- Kind: B2
- Application number: 17/102,665
- Filed: 2020-11-24
- Published: 2021-06-17
- Granted: 2024-06-04
- Earliest claimed: 2019-12-13
- Assignees: Kobe Steel, Ltd.
- Applicants: Kobe Steel, Ltd.
- Inventors: Tomoki Hosokawa; Takahiko Nakamura
- Web page: https://patentgrep.com/patent/US12000026B2

## CPC

- C22C 21/02: with silicon as the next major constituent
- C21D 8/0226: {Hot rolling}
- C21D 8/0236: {Cold rolling}
- C21D 8/0247: characterised by the heat treatment
- C22C 21/08: with silicon
- C22C 21/14: with silicon
- C22C 21/16: with magnesium
- C22F 1/04: of aluminium or alloys based thereon
- C22F 1/043: of alloys with silicon as the next major constituent
- C22F 1/047: of alloys with magnesium as the next major constituent
- C22F 1/05: of alloys of the Al-Si-Mg type, i.e. containing silicon and magnesium in approximately equal proportions
- C22F 1/057: of alloys with copper as the next major constituent
- C22C: ALLOYS (treatment of alloys C21D, C22F)
- 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)
- 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)

## Abstract

Provided are an aluminum alloy sheet for automotive structural member which is excellent and well-balanced in strength, formability, and crushability, an automotive structural member, and a method for manufacturing an aluminum alloy sheet for automotive structural member. An aluminum alloy sheet for automotive structural member is an Al—Mg—Si-based aluminum alloy sheet containing, in mass %, Mg: 0.4% or more and 1.0% or less, Si: 0.6% or more and 1.2% or less, and Cu: 0.6% or more and 1.3% or less with the remainder being Al and inevitable impurities and having an earing ratio of −13.0% or less.

## Claims

### Claim 1

An aluminum alloy sheet for automotive structural member which is an Al—Mg—Si-based aluminum alloy sheet containing, in mass %, Mg: 0.4% or more and 1.0% or less, Si: 0.6% or more and 1.2% or less, and Cu: 0.7% or more and 1.3% or less with the remainder being Al and inevitable impurities, wherein an earing ratio is −13.0% or less and a VDA bending ratio is 95° or more.

### Claim 2 (depends on 1)

The aluminum alloy sheet for automotive structural member according to claim 1, wherein the content of Mg in mass % is 0.4% or more and 0.6% or less.

### Claim 3 (depends on 2)

The aluminum alloy sheet for automotive structural member according to claim 2, wherein the content of Si in mass % is 0.6% or more and 0.8% or less.

### Claim 4 (depends on 2)

The aluminum alloy sheet for automotive structural member according to claim 2, further containing, in mass %, at least one selected from the group consisting of Mn: 1.0% or less, Fe: 0.5% or less, Cr: 0.3% or less, Zr: 0.2% or less, V: 0.2% or less, Ti: 0.1% or less, Zn: 0.5% or less, Ag: 0.1% or less, and Sn: 0.15% or less.

### Claim 5 (depends on 3)

The aluminum alloy sheet for automotive structural member according to claim 3, further containing, in mass %, at least one selected from the group consisting of Mn: 1.0% or less, Fe: 0.5% or less, Cr: 0.3% or less, Zr: 0.2% or less, V: 0.2% or less, Ti: 0.1% or less, Zn: 0.5% or less, Ag: 0.1% or less, and Sn: 0.15% or less.

### Claim 6 (depends on 1)

The aluminum alloy sheet for automotive structural member according to claim 1, wherein the content of Si in mass % is 0.6% or more and 0.8% or less.

### Claim 7 (depends on 6)

The aluminum alloy sheet for automotive structural member according to claim 6, further containing, in mass %, at least one selected from the group consisting of Mn: 1.0% or less, Fe: 0.5% or less, Cr: 0.3% or less, Zr: 0.2% or less, V: 0.2% or less; Ti: 0.1% or less, Zn: 0.5% or less, Ag: 0.1% or less, and Sn: 0.15% or less.

### Claim 8 (depends on 1)

The aluminum alloy sheet for automotive structural member according to claim 1, further containing, in mass %, at least one selected from the group consisting of Mn: 1.0% or less, Fe: 0.5% or less, Cr: 0.3% or less, Zr: 0.2% or less, V: 0.2% or less, Ti: 0.1% or less, Zn: 0.5% or less, Ag: 0.1% or less, and Sn: 0.15% or less.

### Claim 9 (depends on 1)

The aluminum alloy sheet for automotive structural member according to claim 1, wherein the aluminum alloy sheet for automotive structural member has such a bake hard property that, after 20-minute artificial aging treatment is performed at 180° C., a 0.2% proof stress is 250 MPa or more.