US4019931A
Expired / Lapsed
US
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Thread plate process
Assignee: Rio Tinto Switzerland AG
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Filing: 1976-03-04
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Granted: 1977-04-26
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Expires: 1996-03-04
Abstract
Abstract The present invention comprises an improved process for the preparation of aluminum base alloys containing magnesium and silicon in wrought form, and particularly as tread plate which includes the steps of casting, homogenizing, hot rolling within a critical temperature and time range and cooling at a rate greater than a critical rate and before a critical delay time after said hot rolling step. The resulting product can be artificially aged without the need for a separate solution heat treatment and possesses improved tensile properties, surface appearance and corrosion resistance.
Inventors
- 👤 William C. Setzer
- 👤 Harvey P. Cheskis
- 👤 Michael J. Pryor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 23:19
CPC Classifications
C; C22; C22F; C22F1/00; C22F1/04; C22F1/05
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
159 words
A method for the preparation of aluminum base alloys in wrought form possessing improved tensile properties which consists of: A. providing an aluminum base alloy containing up to about 1.5% magnesium and up to 1.35% silicon in the cast condition; B. homogenizing said alloy at a temperature above 900° F for a period of from 8-14 hours; C. hot rolling said alloy in excess of 20% reduction at a starting temperature of above 900° F; D. continuously hot rolling said alloy at temperatures below the solubility limit thereof, during which said alloy is held for no more than about 4 minutes at a temperature of about 850° F, no more than about 2 minutes at a temperature of about 800° F and no more than about 1 minute in the temperature range of from about 750°-550° F, and quenching the alloy whereby the temperature of said alloy is reduced to below 550° F in no more than 1 minute.
Claim 2
Independent Claim
159 words
A method for the preparation of aluminum base alloys in wrought form possessing improved tensile properties which consists of: A. providing an aluminum base alloy containing up to about 1.5% magnesium and up to 1.35% silicon in the cast condition; B. homogenizing said alloy at a temperature above 900° F for a period of from 8-14 hours; C. hot rolling said alloy in excess of 20% reduction at a starting temperature of above 900° F; D. continuously hot rolling said alloy at temperatures below the solubility limit thereof, during which said alloy is held for no more than about 4 minutes at a temperature of about 850° F, no more than about 2 minutes at a temperature of about 800° F and no more than about 1 minute in the temperature range of from about 750°-550° F, and quenching the alloy whereby the temperature of said alloy is reduced to below 550° F in no more than 1 minute.
Claim 3
Dependent Claim
21 words
The method of claim 1 wherein said alloy comprises from about 0.20-1.35% silicon, and from about 0.3-1.5% magnesium, balance essentially aluminum.
Claim 4
Dependent Claim
32 words
The method of claim 3 wherein said alloy further comprises from about 0.05 to about 0.15% manganese, from about 0.05 to about 0.15% chromium and from about 0.05 to about 0.15% zirconium.
Claim 5
Dependent Claim
18 words
The method of claim 1 wherein said alloy is homogenized at a temperature ranging from about 1000-1050° F.
Claim 6
Dependent Claim
20 words
The method of claim 1 wherein said hot rolling is conducted at a starting temperature of from about 950-1100° F.
Claim 7
Dependent Claim
16 words
The method of claim 1 wherein said hot rolling is conducted in excess of 30% reduction.
Claim 8
Dependent Claim
25 words
The method of claim 1 wherein said hot rolling employs as a last rolling step prior to said quenching passing said alloy through embossing rolls.
Claim 9
Dependent Claim
12 words
The method of claim 7 wherein said wrought form comprises tread plate.
Claim 10
Independent Claim
168 words
A method for the preparation of aluminum base alloys in wrought form possessing improved tensile properties which consists of: A. providing an aluminum base alloy containing up to about 1.5% magnesium and up to 1.35% silicon in the cast condition; B. homogenizing said alloy at a temperature above 900° F for a period of from 8-14 hours; C. hot rolling said alloy in excess of 20% reduction at a starting temperature of above 900° F; D. continuously hot rolling said alloy at temperatures below the solubility limit thereof, during which said alloy is held for no more than about 4 minutes at a temperature of about 850° F, no more than about 2 minutes at a temperature of about 800° F and no more than about 1 minute in the temperature range of from about 750°-550° F; E. quenching the alloy whereby the temperature of said alloy is reduced to below 550° F in no more thabn 1 minute; and F. subjecting the alloy to an aging treatment.
Claim 11
Independent Claim
168 words
A method for the preparation of aluminum base alloys in wrought form possessing improved tensile properties which consists of: A. providing an aluminum base alloy containing up to about 1.5% magnesium and up to 1.35% silicon in the cast condition; B. homogenizing said alloy at a temperature above 900° F for a period of from 8-14 hours; C. hot rolling said alloy in excess of 20% reduction at a starting temperature of above 900° F; D. continuously hot rolling said alloy at temperatures below the solubility limit thereof, during which said alloy is held for no more than about 4 minutes at a temperature of about 850° F, no more than about 2 minutes at a temperature of about 800° F and no more than about 1 minute in the temperature range of from about 750°-550° F; E. quenching the alloy whereby the temperature of said alloy is reduced to below 550° F in no more thabn 1 minute; and F. subjecting the alloy to an aging treatment.
Claim 12
Dependent Claim
29 words
The method of claim 9 wherein said aging treatment comprises heat treating said hot rolled alloy for at least 15 minutes at a temperature ranging from about 275°-450° F.
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) | 1980-04-25 | 1980-10-25 | 1981-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-25 | 1984-10-25 | 1985-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-25 | 1988-10-25 | 1989-04-26 | $7700.00 | Window Closed / Lapsed |