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US3816190A
Expired / Lapsed
US
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Method of heat-treatment of aluminum alloys
Assignee: Vereinigte Metallwerke Ranshoffen Berndorf AG
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Filing: 1972-05-22
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Granted: 1974-06-11
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Expires: 1992-05-22
Abstract
Abstract A method of heat treatment of aluminum alloys of the type Al-MgSi for the purpose of improvement of the processibility by extruding, which comprises the steps of subjecting said alloys to a homogenization-glowing at 530*C to 580*C, and cooling and alloys to a temperature range of 230*C to 270*C, while maintaining a substantially uniform temperature gradient. The cooling step takes place at a speed of at least 100*C/h without quenching, and a holding period is maintained within the temperature range of 230*C to 270*C, for a time period of about 4 to 24 hours, whereupon further cooling or heating to working temperature of said alloys is performed.
Inventors
- 👤 P Warbichler
- 👤 B Warbichler
- 👤 I Fraioli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 06:27
CPC Classifications
C; C22; C22F; C22F1/00; C22F1/04; C22F1/05
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
18 words
The method, as set forth in claim 1, wherein said holding period is maintained for about 8 hours.
Claim 2
Dependent Claim
18 words
The method, as set forth in claim 1, wherein said holding period is maintained for about 24 hours.
Claim 3
Independent Claim
97 words
A method of heat treatment of aluminum alloys of the type Al-Mg-Si for the purpose of improvement of the processibility by extruding, comprising the steps of subjecting said alloys to a homogenization-glowing at 530*C to 580*C, cooling said alloys to a temperature within the range of 230*C to 270*C, while maintaining a substantially uniform temperature gradient, said cooling step taking place at a speed of at least 100*C/h without quenching, maintaining a holding period of about 4 to 24 hours within said temperature range of 230*C to 270*C, and heating to extrusion working temperature of said alloys.
Claim 4
Dependent Claim
18 words
The method, as set forth in claim 4, wherein said holding period is maintained for about 8 hours.
Claim 5
Dependent Claim
18 words
The method, as set forth in claim 4, wherein said holding period is maintained for about 24 hours.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-10 | 1977-12-10 | 1978-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-10 | 1981-12-10 | 1982-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-10 | 1985-12-10 | 1986-06-11 | $7700.00 | Window Closed / Lapsed |