US4151013A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aluminum-magnesium alloys sheet exhibiting improved properties for forming and method aspects of producing such sheet
Assignee: Reynolds Metals Co
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Filing: 1978-02-10
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Granted: 1979-04-24
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Expires: 1998-02-10
Abstract
Abstract Described is Al-Mg Sheet, in annealed condition, which has good formability and is further characterized structurally by its ability to be formed in the manufacture of sheet-metal products without being marked by Type A Luder lines. Also described are method aspects of producing such sheet, including the steps of selectively annealing and quenching followed by stretching.
Inventors
- 👤 David S. Thompson
- 👤 John S. Prestley, Jr.
- 👤 Thomas E. Webb
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:00
CPC Classifications
C; C22; C22F; C22F1/00; C22F1/04; C22F1/047
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
174 words
In processing cold rolled, work-hardened sheet, said sheet being further characterized by its alloy composition consisting essentially of aluminum and from about 2 to about 8% magnesium by weight and by its work-hardened state corresponding to having been cold rolled to effect a thickness reduction of at least 40%, the method of rendering said sheet in a highly formable finished condition wherein the finished sheet will form free from Type A Luder lines when strained from about 1/4% to about 2.5%, which comprises the following steps: heating said sheet to a temperature T in the range of from about 850° F. to about 1050° F; then quenching said sheet down to about 350° F. in temperature at a rate of at least about Q, and at most about 9000° F./Second, where Q is ascertained according to the following equation: Log.sub.10 (Q)=2.785-0.030657(T-900)+0.00053144(T-900).sup.2 -0.0000074631(T-900).sup.3, Q being in ° F./second and T being in ° F.; and then uniformly stretching said sheet to effect a permanent set along its length of from about 0.25% to about 1%.
Claim 2
Dependent Claim
174 words
In processing cold rolled, work-hardened sheet, said sheet being further characterized by its alloy composition consisting essentially of aluminum and from about 2 to about 8% magnesium by weight and by its work-hardened state corresponding to having been cold rolled to effect a thickness reduction of at least 40%, the method of rendering said sheet in a highly formable finished condition wherein the finished sheet will form free from Type A Luder lines when strained from about 1/4% to about 2.5%, which comprises the following steps: heating said sheet to a temperature T in the range of from about 850° F. to about 1050° F; then quenching said sheet down to about 350° F. in temperature at a rate of at least about Q, and at most about 9000° F./Second, where Q is ascertained according to the following equation: Log.sub.10 (Q)=2.785-0.030657(T-900)+0.00053144(T-900).sup.2 -0.0000074631(T-900).sup.3, Q being in ° F./second and T being in ° F.; and then uniformly stretching said sheet to effect a permanent set along its length of from about 0.25% to about 1%.
Claim 3
Dependent Claim
18 words
The method of claim 1 wherein said quenching of said sheet is at a rate of about Q.
Claim 4
Dependent Claim
21 words
The method of claim 1 wherein said stretching of said sheet effects a permanent set along its length of about 0.5%.
Claim 5
Dependent Claim
28 words
The method of claim 1 wherein said heating of said sheet is to a temperature T in the range of from about 900° F. to about 950° F.
Claim 6
Dependent Claim
22 words
The method of claim 4 wherein said heating of said sheet is from about 1/2 minute to about 10 minutes in duration.
Claim 7
Dependent Claim
55 words
The method of claim 1 wherein said alloy composition consists of up to 0.20% silicon, up to 0.35% iron, up to 0.15% copper, 0.20 to 0.50% manganese, 4.0 to 5.0% magnesium, up to 0.10% chromium, up to 0.25% zinc, up to 0.10% titanium and other elements not exceeding 0.05% each and 0.15% total, balance aluminum.
Claim 8
Dependent Claim
21 words
The method of claim 6 wherein said stretching of said sheet effects a permanent set of about 0.5% along its length.
Claim 9
Dependent Claim
40 words
The method of claim 7 wherein said heating of said sheet is to a temperature T in the range of from about 900° F. to about 950° F. and is from about 1/2 minute to about 5 minutes in duration.
Claim 10
Dependent Claim
14 words
The method of claim 8 wherein said quenching of said sheet is about Q.
Claim 11
Dependent Claim
12 words
Finished sheet as set forth and processed in accordance with claim 1.
Claim 12
Dependent Claim
12 words
Finished sheet as set forth and processed in accordance with claim 8.
Claim 13
Dependent Claim
36 words
A sheet-metal product formed from the finished sheet set forth in claim 11 wherein at least a portion of the sheet metal product is formed by straining said finished sheet from about 1/4% to about 2.5%.
Claim 14
Dependent Claim
46 words
An exterior automotive body component, such as a fender or the like, formed from the finished sheet set forth in claim 11 wherein at least a portion of the exterior automotive body component is formed by straining said finished sheet from about 1/4% to about 2.5%.
Claim 15
Dependent Claim
27 words
The exterior automotive body component of claim 13 at least a portion of which is formed by straining said finished sheet from about 1/4% to about 1.5%.
References Cited (Backward Citations)
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US3661657A
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Cited
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-04-23 | 1982-10-23 | 1983-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-23 | 1986-10-23 | 1987-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-23 | 1990-10-23 | 1991-04-24 | $7700.00 | Window Closed / Lapsed |