US3941620A
Expired / Lapsed
US
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Method of processing copper base alloys
Assignee: Olin Corp
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Filing: 1974-12-18
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Granted: 1976-03-02
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Expires: 1994-12-18
Abstract
Abstract Method of processing nickel-tin containing copper base alloys in order to obtain an improved combination of strength and bend properties. The alloys processed herein contain from 7 to 14% nickel and from 1.5 to 3.3% tin.
Inventors
- 👤 Michael J. Pryor
- 👤 Jacob Crane
- 👤 Sam Friedman
- 👤 Eugene Shapiro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:07
CPC Classifications
C; C22; C22C; C22C9/00; C22C9/06; C22F; C22F1/00; C22F1/08
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
91 words
A method for processing copper base alloys to provide good strength and bend characteristics which comprises: A. providing a completely recrystallized, wrought copper base alloy consisting essentially of 7 to 14% nickel, 1.5 to 3.3% tin and the balance copper; B. cold rolling with a reduction of 20 to 50%; C. aging at a temperature of from 300° to 550°C for 15 minutes to 24 hours; and D. cold rolling with a reduction of from 20 to 55%, wherein the total reduction of said recrystallized alloy is less than about 65%.
Claim 2
Independent Claim
91 words
A method for processing copper base alloys to provide good strength and bend characteristics which comprises: A. providing a completely recrystallized, wrought copper base alloy consisting essentially of 7 to 14% nickel, 1.5 to 3.3% tin and the balance copper; B. cold rolling with a reduction of 20 to 50%; C. aging at a temperature of from 300° to 550°C for 15 minutes to 24 hours; and D. cold rolling with a reduction of from 20 to 55%, wherein the total reduction of said recrystallized alloy is less than about 65%.
Claim 3
Dependent Claim
47 words
A method according to claim 1 wherein said recrystallized, wrought copper alloy is provided in step (A) by hot rolling the alloy with a finishing temperature in excess of 650°C, and wherein the total reduction following recrystallization in steps (B) and (D) is less than about 65%.
Claim 4
Dependent Claim
88 words
A method according to claim 1 wherein said recrystallized, wrought copper alloy is provided in step (A) by: hot rolling the alloy with a finishing temperature in excess of 550°C; and cold rolling and annealing so that the alloy is completely recrystallized following the annealing step, with the amount of cold reduction being at least 20% and with the annealing temperature being in the range of 600° to 850°C for at least 1 minute, wherein the total reduction following the recrystallization annealing step is less than about 65%.
Claim 5
Dependent Claim
33 words
A process according to claim 1 wherein said copper base alloy contains a material selected from the group consisting of iron from 0.1 to 3%, cobalt from 0.1 to 3% and mixtures thereof.
Claim 6
Dependent Claim
15 words
A process according to claim 4 wherein the minimum iron plus cobalt content is 1.0%.
Claim 7
Dependent Claim
25 words
A process according to claim 3 wherein said alloy is given a cold reduction of from 40 to 70% prior to said recrystallization annealing step.
Claim 8
Dependent Claim
25 words
A process according to claim 3 wherein said recrystallization annealing step is at a temperature of from 650° to 750°C for at least 15 minutes.
Claim 9
Dependent Claim
15 words
A process according to claim 1 wherein the minimum nickel plus tin content is 9.5%.
Claim 10
Dependent Claim
35 words
A process according to claim 8 wherein said copper alloy has a nickel content from 9 to 11%, a tin content of from 2 to 3% and a minimum nickel plus tin content of 11.5%.
Claim 11
Dependent Claim
27 words
A process according to claim 1 including the following additional step E.: aging at a temperature of from 300° to 500°C for 15 minutes to 24 hours.
Claim 12
Dependent Claim
32 words
A process according to claim 10 including an additional cold reduction step (F) following aging step (E), provided that the total cold reduction of said recrystallized alloy is less than about 65%.
References Cited (Backward Citations)
US1928747A
Cited
US3522112A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-03-02 | 1979-09-01 | 1980-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-02 | 1983-09-01 | 1984-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-02 | 1987-09-01 | 1988-03-02 | $7700.00 | Window Closed / Lapsed |