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US4235628A
Expired / Lapsed
US
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Al-Mn Alloy and process of manufacturing semifinished products having improved strength properties
Assignee: GEA Group AG
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Filing: 1978-11-30
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Granted: 1980-11-25
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Expires: 1998-11-30
Abstract
Abstract An Al-Mn alloy which can be brazed and enamelled, has a high resistance to corrosion and in a completely recrystallized state has an ultimate tensile stress of at least 150 N/mm 2 ; a process for producing such an Al-Mn alloy by forming a melt comprising 0.8 to 2 weight percent manganese, 1.40 to 3 weight percent silicon, 0.2 to 1 weight percent iron, 0 to 0.2 weight percent copper, 0 to 0.2 weight percent magnesium, balance aluminum and in a total up to 0.2 by weight inevitable impurities which are due to the manufacture, casting said melt to form an ingot, annealing said ingot to 400° to 620° C. for 2 to 20 hours, hot-rolling and cold-rolling said ingot to final dimensions of the semifinished product, and subsequently annealing the semifinished product at a temperature above 450° C.
Inventors
- 👤 Heinz J. Althoff
- 👤 Heinz Lommel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:29
CPC Classifications
A; A47; A47J; A47J36/00; A47J36/02; C; C22; C22C; C22C21/00; C22C21/02; C22C21/04; C22F; C22F1/00; C22F1/04; C22F1/043
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
79 words
An Al-Mn alloy which can be brazed and enamelled, has a high resistance to corrosion and in a completely recrystallized state has an ultimate tensile stress of at least 150 N/mm 2 , said alloy consisting essentially of: 0.8 to 2 weight percent manganese 1.40 to 3 weight percent silicon 0.2 to 1 weight percent iron 0 to 0.2 weight percent copper 0 to 0.2 weight percent magnesium, the balance being aluminum with up to 0.2 weight percent impurities.
Claim 2
Dependent Claim
79 words
An Al-Mn alloy which can be brazed and enamelled, has a high resistance to corrosion and in a completely recrystallized state has an ultimate tensile stress of at least 150 N/mm 2 , said alloy consisting essentially of: 0.8 to 2 weight percent manganese 1.40 to 3 weight percent silicon 0.2 to 1 weight percent iron 0 to 0.2 weight percent copper 0 to 0.2 weight percent magnesium, the balance being aluminum with up to 0.2 weight percent impurities.
Claim 3
Dependent Claim
26 words
An alloy according to claim 1 containing less than 0.01 percent by weight any one of the elements zinc, lead, chromium, nickel, tin, cadmium and bismuth.
Claim 4
Dependent Claim
16 words
An alloy according to claim 1 wherein the weight ratio of silicon to iron is 1-6:1.
Claim 5
Dependent Claim
15 words
An alloy according to claim 3 wherein the weight ratio of to iron is 2-:1.
Claim 6
Dependent Claim
19 words
An alloy according to claim 3 wherein the total content of manganese and silicon is at least 2 percent.
Claim 7
Dependent Claim
20 words
An alloy according to claim 5 wherein the total content of manganese and silicon is 2.5 to 3.5 weight percent.
Claim 8
Dependent Claim
13 words
An alloy according to claim 1 containing up to 0.5 weight percent zirconium.
Claim 9
Dependent Claim
9 words
A semi-finished product of the alloy of claim 1.
Claim 10
Dependent Claim
119 words
A process for the manufacture of a semi-finished product which can be brazed and enamelled, has improved strength properties which comprises: a. forming a melt consisting essentially of 0.8 to 2 weight percent manganese 1.40 to 3 weight percent silicon 0.2 to 1 weight percent iron 0 to 0.2 weight percent copper 0 to 0.2 weight percent magnesium, the balance being aluminum with up to 0.2 weight percent impurities; b. casting said melt to form an ingot; c. annealing said ingot at a temperature of 400° to 620° C. for 2 to 20 hours; d. hot-forming and cold-forming said annealed ingot to final dimensions of the semi-product; and e. annealing the so-formed semi-product at a temperature above 450° C.
Claim 11
Dependent Claim
119 words
A process for the manufacture of a semi-finished product which can be brazed and enamelled, has improved strength properties which comprises: a. forming a melt consisting essentially of 0.8 to 2 weight percent manganese 1.40 to 3 weight percent silicon 0.2 to 1 weight percent iron 0 to 0.2 weight percent copper 0 to 0.2 weight percent magnesium, the balance being aluminum with up to 0.2 weight percent impurities; b. casting said melt to form an ingot; c. annealing said ingot at a temperature of 400° to 620° C. for 2 to 20 hours; d. hot-forming and cold-forming said annealed ingot to final dimensions of the semi-product; and e. annealing the so-formed semi-product at a temperature above 450° C.
Claim 12
Dependent Claim
29 words
A process according to claim 9 wherein the melt contains less than 0.01 weight percent of any one of the elements zinc, lead, chromium, nickel, tin, cadmium and bismuth.
Claim 13
Dependent Claim
22 words
A process according to claim 9 wherein the weight ratio of to iron in the melt is in the range of 1-6:1.
Claim 14
Dependent Claim
16 words
A process according to claim 11 wherein the weight ratio of silicon to iron is 2-:1.
Claim 15
Dependent Claim
21 words
A process according to claim 9 wherein the total content of maganese and silicon in the melt is at least 2%.
Claim 16
Dependent Claim
20 words
A process according to claim 13 wherein the total content of maganese and silicon is 2.5 to 3.5 weight percent.
Claim 17
Dependent Claim
19 words
A process according to claim 9 wherein said ingot is annealed at a temperature of 500° to 620° C.
Claim 18
Dependent Claim
24 words
A process according to claim 9 wherein the ingot is annealed at a temperature of 400° to 500° C. for 2 to 20 hours.
Claim 19
Dependent Claim
52 words
A process according to claim 9 wherein said ingot is annealed at a temperature of 400° to 500° C. for 4 to 20 hours and following the final annealing at a temperature above 450° C. the product is subjected to further cold-forming or articles are made from the semifinished product by cold-forming.
Claim 20
Dependent Claim
16 words
A process according to claim 17 wherein said melt contains up to 0.5 weight percent zirconium.
Claim 21
Dependent Claim
16 words
A process according to claim 9 wherein said melt is continuously cast to form an ingot.
References Cited (Backward Citations)
US4033794A
Cited
US4137102A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-11-25 | 1984-05-26 | 1984-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-11-25 | 1988-05-26 | 1988-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-11-25 | 1992-05-26 | 1992-11-25 | $7700.00 | Window Closed / Lapsed |