US3834900A - Strip casting aluminum alloy - Google Patents
Strip casting aluminum alloy Download PDFInfo
- Publication number
- US3834900A US3834900A US00297828A US29782872A US3834900A US 3834900 A US3834900 A US 3834900A US 00297828 A US00297828 A US 00297828A US 29782872 A US29782872 A US 29782872A US 3834900 A US3834900 A US 3834900A
- Authority
- US
- United States
- Prior art keywords
- alloy
- weight
- aluminum
- strength
- magnesium
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
- C22C21/06—Alloys based on aluminium with magnesium as the next major constituent
Definitions
- An aluminum alloy comprising, by weight, 2.4 to 3.2% magnesium, 0.6 to 0.8% iron, 0.2 to 0.3% silicon, 0.2 to 0.3% copper, 0.2 to 0.3% manganese, 0.005 to 0.025% titanium, and 0.005 to 0.025% boron, and less than 0.01% chromium, the balance being aluminum, is especially useful since it can be formed by strip casting.
- the alloy possesses a combination of strength and formability well suited for aluminum can ends and drawn and ironed can bodies.
- This invention relates to an aluminum alloy composition, and more particularly to an aluminum alloy containing 2.4 to 3.2% by weight magnesium suitable for strip casting and use in can making.
- An aluminum alloy contemplated for use as a can component must have sufficient strength to safely contain the material within the can, and this strength must be retained after exposure to the baking temperature employed in curing the coatings applied to the can components.
- the alloy also must be sufficiently workable to be fashioned into a can body or an easy open end, such as disclosed in the above-mentioned US. patent.
- magnesium should be employed, and that at least 4-5 by weight magnesium was required.
- 4% minimum magnesium content is required only for slab casting, which is a relatively thick casting (nominally about 1 foot) having a relatively slow solidification process, which permits the magnesium to become less uniformly dispersed.
- the non-uniform dispersion in slab casting creates the need for a 4% minimum magnesium level on a bulk scale in order that any given minute section of the slab cast web will contain an adequate amount of magnesium for sufiicient strength.
- a strip cast aluminum alloy with a lesser quantity of magnesium can achieve substantially the same strength level as a slab cast alloy having a greater quantity of magnesium.
- the faster solidification in the strip cast web enables the magnesium to be more uniformly dispersed, thereby lessening the amount of magnesium that need be employed, which results in large material cost savings.
- the novel alloy disclosed herein, as noted, is particularly useful for easy open can ends. Increasing the strength of an alloy generally increases the brittleness, and a strong, brittle alloy with suiiicient formability is ideal for easy open ends.
- the instant invention thus provides a strong alloy with suflicient ductility that can be formed into an easy open end that is as strong as present commercial ends, but yet tears open easily.
- the instant invention provides an aluminum alloy suitable for strip casting which comprises, by weight, 2.4 to 3.2% magnesium, 0.6 to 0.8% iron, 0.2 to 0.3% silicon, 0.2 to 0.3% copper, 0.2 to 0.3% manganese, 0.005 to 0.025% titanium, 0.005 to 0.025% boron, and less than 0.01% chromium, the balance being aluminum.
- compositional range set forth in the preceding paragraph represents an alloy which, if cold rolled to H19 temper (usually achieved by an -90% reduction in thickness), possesses a tensile strength of at least 55,000 p.s.i., a yield strength of at least 50,000 p.s.i. (an indication of sufficient strength for can making purposes) and an elongation in two inches of about 3.1 to 3.6% (a measure of suflicient formability for can making purposes).
- Table I indicates a preferred range of composition and a target composition, in percent by weight, which could be deemed the preferred embodiment of the instant invention:
- the resultant alloy will be too weak for purposes contemplated by the instant invention. If the magnesium employed exceeds the specified levels it becomes difiicult to get solidification of the alloy after it is strip cast. If the iron, silicon, copper, or manganese exceed the desired levels, alloy constituents may form which tend to cause brittleness and/or fracturing. Chromium is an impurity that is to be minimized to avoid casting defects. Titanium and boron are grain refiners and if they are employed in insufiicient amounts the grains of the alloy tend to become too coarse, resulting in poor alloy engineering properties.
- sheet A The strength of the novel alloy of the instant invention (sheet A) is best illustrated by comparing it with an alloy (sheet B) presently employed by the can making industry.
- sheet B The strength of the novel alloy of the instant invention (sheet A) is best illustrated by comparing it with an alloy (sheet B) presently employed by the can making industry.
- Table II provides a chemical analysis in percent by weight:
- novel alloy is not as strong as the presently commercial alloy, it does exceed 55,000 p.s.i. tensile strength, which is required for can making purposes. Simi- 'larly, the elongations are not as high for the novel alloy as for the presently commercial alloy but are considered adequate for manufacture of easy open ends.
- Table III indicates the properties of the alloy sheet in the as rolled condition. However, these sheets must be exposed to coating :and baking processes, and it is after such exposure that the properties of the sheet are of greatest importance, since these are the properties which will be exhibited by the sheet when provided as a can end or body.
- the properties listed in Table III are indicated in Table IV after the sheet has been coated and Percent elongation in 2 inches 6. 8 10. 7
- the pressure deflection characteristic In addition to standard tensile tests, another measure of the strength capacity of a sheet to serve as a can end is the pressure deflection characteristic. This characteristic is determined by providing a beverage can with its end fashioned from the sheet being tested. Pressure is applied within the can and gradually increased until the can end buckles and plastically deforms. The pressure at which the can end buckles is then designated as the buckle pressure. In buckling tests comparing sheets A and B, sheet A is capable of achieving the same strength at 0.0140 inch gauge as sheet B is at 0.0135 inch gauge. This additional thickness is a small price to pay for being able to eliminate the step of hot rolling from the mill processing and being able to strip cast the alloy.
- An aluminum alloy suitable for strip casting, consisting essentially of 2.4 to 3.2% by weight magnesium, 0.6 to 0.8% by weight iron, 0.2 to 0.3% by weight silicon, 0.2 to 0.3% by weight copper, 0.2 to 0.3% by weight manganese, 0.005 to 0.025% by weight titanium, 0.005 to 0.025% by weight boron, and less than 0.01% by weight chromium, the balance being aluminum.
- the alloy of Claim 1 which, when cold rolled to an H19 temper possesses a tensile strength of at least 55,000 p.s.i., a yield strength of at least 50,000 p.s.i., and an elongation, in 2 inches, of about 3.1 to 3.6%.
- the alloy of Claim 1 consisting essentially of 2.65 to 2.95% by weight magnesium, 0.63 to 0.68% by weight iron, 0.23 to 0.27% by Weight silicon, 0.23 to 0.27% by weight copper, 0.23 to 0.27% by weight manganese, 0.01 to 0.02% by weight titanium, 0.01 to 0.02% by weight boron and less than 0.001% by weight chromium, the balance being aluminum.
- the alloy of Claim 3 which, when cold rolled to an Hl9 temper possesses a tensile strength of at least 55,000 p.s.i., a yield strength of at least 50,000 p.s.i., and an elongation, in 2 inches, of about 3.1 to 3.6%.
- the alloy of Claim 3 consisting essentially of about 2.8% by Weight magnesium, about 0.65% by weight iron, about 0.25% by weight silicon, about 0.25% by weight copper, about 0.25% by weight manganese, about 0.15% by weight titanium, about 0.015% by weight boron, and 0.000% by weight chromium, the balance being aluminum.
- the alloy of Claim 5 which, when cold rolled to an H19 temper possesses a tensile strength of at least 55,000, p.s.i., a yield strength of at least 50,000 p.s.i., and an elongation, in 2 inches, of about 3.1 to 3.6%.
Abstract
Description
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US00297828A US3834900A (en) | 1972-10-16 | 1972-10-16 | Strip casting aluminum alloy |
CA180,891A CA990976A (en) | 1972-10-16 | 1973-09-12 | Strip casting aluminum alloy |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US00297828A US3834900A (en) | 1972-10-16 | 1972-10-16 | Strip casting aluminum alloy |
Publications (1)
Publication Number | Publication Date |
---|---|
US3834900A true US3834900A (en) | 1974-09-10 |
Family
ID=23147908
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US00297828A Expired - Lifetime US3834900A (en) | 1972-10-16 | 1972-10-16 | Strip casting aluminum alloy |
Country Status (2)
Country | Link |
---|---|
US (1) | US3834900A (en) |
CA (1) | CA990976A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4407679A (en) * | 1980-11-19 | 1983-10-04 | National Steel Corporation | Method of producing high tensile aluminum-magnesium alloy sheet and the products so obtained |
EP0412605A1 (en) * | 1989-08-11 | 1991-02-13 | KOLBENSCHMIDT Aktiengesellschaft | Steering wheel skeleton |
US20060037948A1 (en) * | 2004-08-17 | 2006-02-23 | Adams Steven L | Laser can opener apparatus |
CN111378879A (en) * | 2018-12-29 | 2020-07-07 | Oppo广东移动通信有限公司 | Aluminum alloy structural part and preparation method thereof, middle frame, battery cover and mobile terminal |
-
1972
- 1972-10-16 US US00297828A patent/US3834900A/en not_active Expired - Lifetime
-
1973
- 1973-09-12 CA CA180,891A patent/CA990976A/en not_active Expired
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4407679A (en) * | 1980-11-19 | 1983-10-04 | National Steel Corporation | Method of producing high tensile aluminum-magnesium alloy sheet and the products so obtained |
EP0412605A1 (en) * | 1989-08-11 | 1991-02-13 | KOLBENSCHMIDT Aktiengesellschaft | Steering wheel skeleton |
TR24564A (en) * | 1989-08-11 | 1992-01-01 | Kolbenschmidt Ag | STEERING SKELETON |
US20060037948A1 (en) * | 2004-08-17 | 2006-02-23 | Adams Steven L | Laser can opener apparatus |
CN111378879A (en) * | 2018-12-29 | 2020-07-07 | Oppo广东移动通信有限公司 | Aluminum alloy structural part and preparation method thereof, middle frame, battery cover and mobile terminal |
CN111378879B (en) * | 2018-12-29 | 2021-05-07 | Oppo广东移动通信有限公司 | Aluminum alloy structural part and preparation method thereof, middle frame, battery cover and mobile terminal |
Also Published As
Publication number | Publication date |
---|---|
CA990976A (en) | 1976-06-15 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: AMERICAN CAN PACKAGING INC., AMERICAN LANE, GREENW Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:AMERICAN CAN COMPANY, A NJ CORP.;REEL/FRAME:004835/0338 Effective date: 19861107 Owner name: AMERICAN NATIONAL CAN COMPANY Free format text: MERGER;ASSIGNORS:AMERICAN CAN PACKAGING INC.;TRAFALGAR INDUSTRIES, INC. (MERGED INTO);NATIONAL CAN CORPORATION (CHANGED TO);REEL/FRAME:004835/0354 Effective date: 19870430 Owner name: AMERICAN CAN PACKAGING INC., CONNECTICUT Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:AMERICAN CAN COMPANY, A NJ CORP.;REEL/FRAME:004835/0338 Effective date: 19861107 Owner name: AMERICAN NATIONAL CAN COMPANY, STATELESS Free format text: MERGER;ASSIGNORS:AMERICAN CAN PACKAGING INC.;TRAFALGAR INDUSTRIES, INC. (MERGED INTO);NATIONAL CAN CORPORATION (CHANGED TO);REEL/FRAME:004835/0354 Effective date: 19870430 |