Patent US4256488A successfully refreshed from Google Patents.
US4256488A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Al-Mg-Si Extrusion alloy
Assignee: Rio Tinto Switzerland AG
•
Filing: 1979-09-27
•
Granted: 1981-03-17
•
Expires: 1999-09-27
Abstract
Abstract Moderate strength extrudable dilute Al-Mg-Si aluminum base alloys are prepared comprising from 0.30 to 0.60% magnesium, from 0.45 to 0.70% silicon and from 0.10 to 0.30% copper, which may also include controlled amounts of elements such as chromium, zirconium, manganese, iron, zinc and titanium, wherein the silicon content must not exceed more than 0.30% over that needed to combine with magnesium and iron. Such alloys display lower hot flow stresses and reduced quench sensitivity as compared to AA Alloy 6063 while achieving the same strength levels.
Inventors
- 👤 Ronald J. Livak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 19:18
CPC Classifications
C; C22; C22C; C22C21/00; C22C21/06; C22C21/08; C22C21/12; C22C21/16
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
90 words
An aluminum base dilute Al-Mg-Si extrusion alloy having a controlled excess of silicon characterized by lower hot flow stresses and reduced quench sensitivity as compared to Alloy 6063 while achieving the same strength levels of Alloy 6063 consisting essentially of 0.30 to 0.60% magnesium, 0.45 to 0.70% silicon, up to 0.35% iron, 0.14 to 0.30% copper, up to 0.05% chromium, up to 0.05% zirconium and up to 0.10% manganese wherein the silicon content does not exceed 0.30% plus the sum of 0.58 times magnesium content plus 0.25 times iron content.
Claim 2
Dependent Claim
90 words
An aluminum base dilute Al-Mg-Si extrusion alloy having a controlled excess of silicon characterized by lower hot flow stresses and reduced quench sensitivity as compared to Alloy 6063 while achieving the same strength levels of Alloy 6063 consisting essentially of 0.30 to 0.60% magnesium, 0.45 to 0.70% silicon, up to 0.35% iron, 0.14 to 0.30% copper, up to 0.05% chromium, up to 0.05% zirconium and up to 0.10% manganese wherein the silicon content does not exceed 0.30% plus the sum of 0.58 times magnesium content plus 0.25 times iron content.
Claim 3
Dependent Claim
17 words
The Alloy of claim 1 wherein the total of chromium, zirconium and manganese does not exceed 0.10%.
Claim 4
Dependent Claim
13 words
The alloy of claim 1 wherein the copper content is 0.14 to 0.22%.
Claim 5
Dependent Claim
13 words
The alloy of claim 1 wherein the magnesium content is 0.34 to 0.48%.
Claim 6
Dependent Claim
13 words
The alloy of claim 1 wherein the silicon content is 0.45 to 0.60%.
Claim 7
Dependent Claim
13 words
The alloy of claim 1 wherein the iron content is 0.14 to 0.24%.
Claim 8
Dependent Claim
13 words
The alloy of claim 1 wherein the copper content is 0.16 to 0.18%.
Claim 9
Dependent Claim
26 words
The alloy of claim 1 wherein the alloy contains 0.34 to 0.60% magnesium, 0.45 to 0.60% silicon, 0.14 to 0.24% iron and 0.14 to 0.22% copper.
Claim 10
Dependent Claim
17 words
The alloy of claim 8 wherein the total of chromium, zirconium and manganese does not exceed 0.10%.
Claim 11
Dependent Claim
22 words
The alloy of claim 1 wherein the alloy contains 0.34 to 0.60% magnesium, 0.45 to 0.60% silicon and 0.14 to 0.22% copper.
References Cited (Backward Citations)
US3113052A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-03-16 | 1984-09-15 | 1985-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-16 | 1988-09-15 | 1989-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-16 | 1992-09-15 | 1993-03-17 | $7700.00 | Window Closed / Lapsed |