US3882712A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Processing copper base alloys
Assignee: Olin Corp
•
Filing: 1973-10-01
•
Granted: 1975-05-13
•
Expires: 1993-10-01
Abstract
Abstract Processing copper alloys to obtain an improved combination of yield strength and elongation and the restoration of high yield properties in formed parts. The process is characterized by cold rolling, followed by heat treating, forming and finally heat treating to restore desired properties.
Inventors
- 👤 Stanley Shapiro
- 👤 Ronald N Caron
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 04:54
CPC Classifications
C; C22; C22F; C22F1/00; C22F1/08
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
151 words
A METHOD FOR OBTAINING IMPROVED 0.01 PERCENT OFFSET YIELD, STRENGTH CHARACTERISTICS IN COPPER BASE ALLOY FORMED PARTS WHICH COMPRISES: A. PROVIDING A COPPER BASE ALLOY MATERIAL IN PLATE FORM HAVING A THICKNESS OF FROM 0.300 TO 1.800 INCHES; B. COOL ROLLING SAID MATERIAL TO A TOTAL REDUCTION OF AT LEAST 65 PERCENT; C. HEAT TREATING SAID MATERIAL AT 100* TO 350*C FOR FROM 30 MINUTES TO 8 HOURS TO DECREASE THE TENSILE STRENGTH AND INCREASE THE 0.01 PERCENT OFFSET YIELD STRENGTH WHILE RETAINING THE COLD WORKED MATRIX; D. FORMING SAID MATERIAL AFTER SAID HEAT TREATMENT STEP INTO INCREASE THE 0.01 PERCENT OFFSET YIELD STRENGTH WHILE REE. HEAT TREATING THE FORMED PART AT 100: TO 350*C FOR FROM 30 MINUTES TO 8 HOURS TO DECREASE THE TENSILE STRENGTH AND INCREASE THE 0.01 PERCENT OFFSET YIELD STRENGTH WHILE RETAINING THE COLD WORKED MATRIX, THEREBY PROVIDING A FORMED PART HAVING HIGH YIELD STENGTH CHARACTERISTICS.
Claim 2
Independent Claim
151 words
A METHOD FOR OBTAINING IMPROVED 0.01 PERCENT OFFSET YIELD, STRENGTH CHARACTERISTICS IN COPPER BASE ALLOY FORMED PARTS WHICH COMPRISES: A. PROVIDING A COPPER BASE ALLOY MATERIAL IN PLATE FORM HAVING A THICKNESS OF FROM 0.300 TO 1.800 INCHES; B. COOL ROLLING SAID MATERIAL TO A TOTAL REDUCTION OF AT LEAST 65 PERCENT; C. HEAT TREATING SAID MATERIAL AT 100* TO 350*C FOR FROM 30 MINUTES TO 8 HOURS TO DECREASE THE TENSILE STRENGTH AND INCREASE THE 0.01 PERCENT OFFSET YIELD STRENGTH WHILE RETAINING THE COLD WORKED MATRIX; D. FORMING SAID MATERIAL AFTER SAID HEAT TREATMENT STEP INTO INCREASE THE 0.01 PERCENT OFFSET YIELD STRENGTH WHILE REE. HEAT TREATING THE FORMED PART AT 100: TO 350*C FOR FROM 30 MINUTES TO 8 HOURS TO DECREASE THE TENSILE STRENGTH AND INCREASE THE 0.01 PERCENT OFFSET YIELD STRENGTH WHILE RETAINING THE COLD WORKED MATRIX, THEREBY PROVIDING A FORMED PART HAVING HIGH YIELD STENGTH CHARACTERISTICS.
Claim 3
Dependent Claim
66 words
A method according to claim 1 wherein step (B) includes cold rolling said material in at least two cold rolling cycles to a total reduction of at least 70 percent 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 percent.
Claim 4
Dependent Claim
18 words
A method according to claim 1 wherein the total rEduction in step (B) is at least 85 percent.
Claim 5
Dependent Claim
18 words
A method according to claim 2 wherein the total reduction in step (B) is at least 85 percent.
Claim 6
Dependent Claim
20 words
A method according to claim 4 wherein step (B) includes three cold rolling cycles with two intermediate heat treatment cycles.
Claim 7
Dependent Claim
20 words
A method according to claim 4 wherein step (B) includes two cold rolling cycles with one intermediate heat treatment cycle.
Claim 8
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 9
Dependent Claim
14 words
A method according to claim 1 wherein said copper alloy is a phosphor bronze.
Claim 10
Dependent Claim
13 words
A method according to claim 1 wherein the copper alloy is a nickel-silver.
Claim 11
Dependent Claim
21 words
A method according to claim 1 wherein said copper alloy contains iron in an amount of from 1 to 5 percent.
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) | 1978-05-12 | 1978-11-11 | 1979-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-12 | 1982-11-11 | 1983-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-12 | 1986-11-11 | 1987-05-13 | $7700.00 | Window Closed / Lapsed |