Aluminum sheet with enhanced formability and an aluminum container made from aluminum sheet

• US 10,022,773 B2
• Filed: 09/22/2017
• Issued: 07/17/2018
• Est. Priority Date: 04/30/2014
• Status: Active Grant

• Current Assignee: Alcoa Warrick LLC (Kaiser Aluminum Corporation)
• Original Assignee: Alcoa USA Corp. (Alcoa Corp.)
• Inventors: Rouns, Thomas N., McNeish, David J., Capps, Jean F., Miller, Christopher R.
• Primary Examiner(s): Wyszomierski, George
• Assistant Examiner(s): MORILLO, JANELL COMBS
• Application Number:
  US15/713,203
• Publication Number:
  US 20180009022A1
• Time in Patent Office: 298 Days
• CPC Class Codes: B21D 22/28 of cylindrical articles using consecutive dies
• CPC Class Codes: B21D 51/02 characterised by the structure of the objects B21D51/26 takes precedence
• CPC Class Codes: B21D 51/24 high-pressure containers, e.g. boilers, bottles
• CPC Class Codes: B21D 51/2638 Necking
• CPC Class Codes: B65D 1/0207 characterised by material, e.g. composition, physical features
• CPC Class Codes: B65D 1/0276 having a continuous contact surface, e.g. Champagne-type bottom
• CPC Class Codes: C22C 21/00 Alloys based on aluminium
• CPC Class Codes: C22C 21/06 with magnesium as the next major constituent
• CPC Class Codes: C22C 21/08 with silicon
• CPC Class Codes: C22F 1/04 of aluminium or alloys based thereon
• CPC Class Codes: C22F 1/047 of alloys with magnesium as the next major constituent

Abstract

In some embodiments of present disclosure, a method includes: obtaining an aluminum sheet comprising a 3xxx or a 5xxx alloy having a tensile yield strength as measured in the longitudinal direction of 27-33 ksi and an ultimate tensile strength; wherein the ultimate tensile strength minus the tensile yield strength is less than 3.30 ksi (UTS-TYS<3.30 ksi); and forming a container having a dome from the aluminum sheet.

Claims

1. A method comprising:

obtaining an aluminum sheet comprising a 3xxx or a 5xxx alloy;

wherein the aluminum sheet has a tensile yield strength as measured in the longitudinal direction of 27-33 ksi and an ultimate tensile strength;

wherein the ultimate tensile strength minus the tensile yield strength is less than 3.30 ksi (UTS-TYS<

3.30 ksi); and

wherein the aluminum sheet has a thickness of 0.006 inch to 0.030 inch;

drawing and ironing the aluminum sheet to form an aluminum container having a dome;

necking the aluminum container to reduce a diameter of a portion of the aluminum container to form a bottle; and

finishing the bottle so as to result in the bottle configured to accept a closure.

2. The method of claim 1, wherein the tensile yield strength as measured in the longitudinal direction is 28-32 ksi.

3. The method of claim 1, wherein the tensile yield strength as measured in the longitudinal direction is 28.53-31.14 ksi.

4. The method of claim 1, wherein the ultimate tensile strength minus the tensile yield strength is 2.90-3.30 ksi.

5. The method of claim 1, wherein the ultimate tensile strength minus the tensile yield strength is 2.99-3.30 ksi.

6. The method of claim 1, wherein the aluminum sheet comprises one of AA:

3x03, 3x04 or 3x05.

7. The method of claim 1, wherein the aluminum sheet comprises AA 3104.

8. The method of claim 1, further comprising expanding a section of the portion of the aluminum container having the reduced diameter.

9. The method of claim 8, wherein the section has a length and the length is at least 0.3 inches.

10. The method of claim 9, wherein the length is at least 0.4 inches.

11. The method of claim 1, wherein the aluminum sheet is a 3xxx alloy.

12. The method of claim 1, wherein the 5xxx alloy is a 5043 alloy.