US3855012A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Processing copper base alloys
Assignee: Olin Corp
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Filing: 1973-10-01
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Granted: 1974-12-17
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Expires: 1993-10-01
Abstract
Abstract Processing copper alloys to obtain an improved combination of yield strength and elongation. The process is characterized by cold rolling with interpass heat treatments to a total reduction of at least 70%, followed by a final heat treatment under specified conditions.
Inventors
- 👤 S Shapiro
- 👤 R Caron
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:53
CPC Classifications
C; C22; C22F; C22F1/00; C22F1/08
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
136 words
A METHOD FOR IMPROVED YIELD STRENGTH CHARACTERISTICS IN COPPER OR COPPER BASE ALLOYS WHICH COMPRISES: A. PROVIDING A COPPER BASE ALLOY SELECTED FROM THE GROUP CONSISTING OF THE PHOSPHOR BRONZES AND COPPER ALLOYS CONTIANING FROM 1-5% IRON, IN PLATE FORM HAVING A THICKNESS OF FROM 0.300 TO 1.800 INCHES; B. COLD ROLLING SAID METERIAL IN AT LEAST THREE COLD ROLLING CYCLES TO A TOTAL REDUCTION OF AT LEAST 70% WITH AN INTERMEDIATE HEAT TREATMENT OF FROM 100* TO 350*C FOR FROM 1 TO 4 HOURS BETWEEN EACH COLD ROLLING CYCLE, PROVIDED THAT THE ROLLING REDUCTION IN EACH COLD ROLLING CYCLE IS AT LEAST 25% AND C. SUBJECTING SAID MATERIAL TO A FINAL HEAT TREATMENT AFTER THE LAST COLD ROLLING CYCLE, SAID FINAL HEAT TREATMENT BEING AT 100: TO 350*C FOR FROM 30 MINUTES TO 8 HOURS.
Claim 2
Independent Claim
136 words
A METHOD FOR IMPROVED YIELD STRENGTH CHARACTERISTICS IN COPPER OR COPPER BASE ALLOYS WHICH COMPRISES: A. PROVIDING A COPPER BASE ALLOY SELECTED FROM THE GROUP CONSISTING OF THE PHOSPHOR BRONZES AND COPPER ALLOYS CONTIANING FROM 1-5% IRON, IN PLATE FORM HAVING A THICKNESS OF FROM 0.300 TO 1.800 INCHES; B. COLD ROLLING SAID METERIAL IN AT LEAST THREE COLD ROLLING CYCLES TO A TOTAL REDUCTION OF AT LEAST 70% WITH AN INTERMEDIATE HEAT TREATMENT OF FROM 100* TO 350*C FOR FROM 1 TO 4 HOURS BETWEEN EACH COLD ROLLING CYCLE, PROVIDED THAT THE ROLLING REDUCTION IN EACH COLD ROLLING CYCLE IS AT LEAST 25% AND C. SUBJECTING SAID MATERIAL TO A FINAL HEAT TREATMENT AFTER THE LAST COLD ROLLING CYCLE, SAID FINAL HEAT TREATMENT BEING AT 100: TO 350*C FOR FROM 30 MINUTES TO 8 HOURS.
Claim 3
Dependent Claim
17 words
A method according to claim 1 wherein the total reduction in step (B) is at least 85%.
Claim 4
Dependent Claim
20 words
A method according to claim 2 wherein step (B) includes four cold rolling cycles with three intermediate heat treatment cycles.
Claim 5
Dependent Claim
32 words
A method according to claim 1 wherein the starting material in step (A) is provided by hot rolling an ingot to plate form having a thickness of from 0.300 to 1.800 inches.
Claim 6
Dependent Claim
20 words
A method according to claim 2 wherein said copper alloy contains iron in an amount of from 1 to 5%.
Claim 7
Dependent Claim
23 words
A method according to claim 1 wherein said starting material is a copper base alloy ingot which is cold rolled to plate thickness.
References Cited (Backward Citations)
US3046166A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-16 | 1978-06-17 | 1978-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-16 | 1982-06-17 | 1982-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-16 | 1986-06-17 | 1986-12-17 | $7700.00 | Window Closed / Lapsed |