US4233068A
Expired / Lapsed
US
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Modified brass alloys with improved stress relaxation resistance
Assignee: Olin Corp
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Filing: 1979-11-05
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Granted: 1980-11-11
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Expires: 1999-11-05
Abstract
Abstract An alloy system which exhibits improved resistance to stress relaxation at elevated temperatures utilizes additions of tin or silicon, or mixtures of each of these elements, along with magnesium or magnesium plus aluminum to a copper-zinc base to attain the stress relaxation performance. The composition and processing of this alloy system maintains at least 90% by weight alpha-phase within the alloy.
Inventors
- 👤 Warren F. Smith, Jr.
- 👤 John M. Vitek
- 👤 Eugene Shapiro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:55
CPC Classifications
C; C22; C22C; C22C9/00; C22C9/04; C22F; C22F1/00; C22F1/08
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
120 words
An essentially single-phase alpha alloy which is particularly resistant to stress relaxation at elevated temperatures, said alloy consisting essentially of one component selected from the group consisting of 0.05 to 0.5% by weight magnesium or 0.05 to 0.5% by weight magnesium in combination with 0.02 to 0.5% by weight aluminum, a second component selected from the group consisting of 0.05 to 3.0% by weight silicon or 0.05 to 0.3% by weight silicon in combination with 0.1 to 2.0% by weight tin, from 8 to 32.8% by weight zinc, balance copper, with the amount of said aluminum, silicon or tin being inversely related to the amount of said zinc and with the maximum wt.% zinc=32.8 -4.8×(wt.% Al) -2.3×(wt.% Sn) -6.5×(wt.% Si).
Claim 2
Dependent Claim
120 words
An essentially single-phase alpha alloy which is particularly resistant to stress relaxation at elevated temperatures, said alloy consisting essentially of one component selected from the group consisting of 0.05 to 0.5% by weight magnesium or 0.05 to 0.5% by weight magnesium in combination with 0.02 to 0.5% by weight aluminum, a second component selected from the group consisting of 0.05 to 3.0% by weight silicon or 0.05 to 0.3% by weight silicon in combination with 0.1 to 2.0% by weight tin, from 8 to 32.8% by weight zinc, balance copper, with the amount of said aluminum, silicon or tin being inversely related to the amount of said zinc and with the maximum wt.% zinc=32.8 -4.8×(wt.% Al) -2.3×(wt.% Sn) -6.5×(wt.% Si).
Claim 3
Dependent Claim
62 words
An alloy according to claim 1, wherein said one component is selected from the group consisting of 0.1 to 0.5% by weight magnesium or 0.1 to 0.5% magnesium in combination with 0.05 to 0.5% by weight aluminum and said second component is selected from the group consisting of 0.1 to 2.0% by weight for each of tin or silicon and combinations thereof.
Claim 4
Dependent Claim
21 words
An alloy according to claim 1, wherein the magnesium portion of said one component ranges from 0.1 to 0.2% by weight.
Claim 5
Dependent Claim
22 words
An alloy according to claim 1, wherein said alpha-phase within the alloy accounts for at least 90% by weight of the alloy.
Claim 6
Dependent Claim
24 words
An alloy according to claim 1, wherein said alloy is in worked condition and has a grain size of approximately 0.005 to 0.050 mm.
Claim 7
Dependent Claim
22 words
An alloy according to claim 1, which maintains its single-phase alpha structure at elevated temperatures approaching the solidus temperature of said alloy.
Claim 8
Independent Claim
197 words
A method for producing an essentially single-phase alpha alloy which is particularly resistant to stress relaxation at elevated temperatures, said method comprising the steps of: (a) casting an alloy consisting essentially of one component selected from the group consisting of 0.05 to 0.5% by weight magnesium or 0.05 to 0.5% by weight magnesium in combination with 0.02 to 0.5% by weight aluminum, a second component selected from the group consisting of 0.05 to 3.0% by weight silicon or 0.05 to 3.0% by weight silicon in combination with 0.1 to 2.0% by weight tin, from 8 to 32.8% by weight zinc, balance copper, with the amount of said aluminum, silicon or tin being inversely related to the amount of said zinc and with the maximum wt.% zinc =32.8 -4.8 ×(wt.% Al) -2.3×(wt.% Sn) -6.5×(wt.% Si); (b) hot working said alloy at a temperature above the recrystallization temperature of the alloy and below the solidus temperature of the alloy; (c) cold working said alloy with up to but not including a 100% reduction in area; and (d) annealing the worked alloy at 150° to 900° C. to recrystallize the alloy to a grain size of 0.005 to 0.050 mm.
Claim 9
Independent Claim
197 words
A method for producing an essentially single-phase alpha alloy which is particularly resistant to stress relaxation at elevated temperatures, said method comprising the steps of: (a) casting an alloy consisting essentially of one component selected from the group consisting of 0.05 to 0.5% by weight magnesium or 0.05 to 0.5% by weight magnesium in combination with 0.02 to 0.5% by weight aluminum, a second component selected from the group consisting of 0.05 to 3.0% by weight silicon or 0.05 to 3.0% by weight silicon in combination with 0.1 to 2.0% by weight tin, from 8 to 32.8% by weight zinc, balance copper, with the amount of said aluminum, silicon or tin being inversely related to the amount of said zinc and with the maximum wt.% zinc =32.8 -4.8 ×(wt.% Al) -2.3×(wt.% Sn) -6.5×(wt.% Si); (b) hot working said alloy at a temperature above the recrystallization temperature of the alloy and below the solidus temperature of the alloy; (c) cold working said alloy with up to but not including a 100% reduction in area; and (d) annealing the worked alloy at 150° to 900° C. to recrystallize the alloy to a grain size of 0.005 to 0.050 mm.
Claim 10
Dependent Claim
30 words
A method according to claim 7, wherein said cold working is accomplished in cycles with said annealing, provided that a cold working step is the last step of the cycle.
Claim 11
Dependent Claim
27 words
A method according to claim 7, wherein said beta-phase in the alloy is kept to a maximum of 10% by weight throughout the processing of the alloy.
Claim 12
Dependent Claim
30 words
A method according to claim 7, wherein said alloy is annealed at 200° to 800° C. for 1 to 24 hours after said hot working but before said cold working.
Claim 13
Dependent Claim
16 words
A method according to claim 7, wherein said hot working is at 500° to 1000° C.
Claim 14
Dependent Claim
22 words
A method according to claim 7, wherein said cold working utilizes a 10 to 98% reduction in cross-sectional area of said alloy.
Claim 15
Dependent Claim
25 words
A method according to claim 7, wherein the surface of said alloy is milled or cleaned after said hot working but before said cold working.
Claim 16
Dependent Claim
64 words
A method according to claim 7, wherein said one component is selected from the group consisting of 0.1 to 0.5% by weight magnesium or 0.1 to 0.5% by weight magnesium in combination with 0.05 to 0.5% by weight aluminum and said second component is selected from the group consisting of 0.1 to 0.2% by weight for each of tin or silicon and combinations thereof.
Claim 17
Dependent Claim
22 words
A method according to claim 7, wherein said alpha-phase within the alloy accounts for at least 90% by weight of the alloy.
Claim 18
Dependent Claim
22 words
A method according to claim 7, which maintains its single-phase alpha structure at elevated temperatures approaching the solidus temperature of said alloy.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-11-11 | 1984-05-12 | 1984-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-11-11 | 1988-05-12 | 1988-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-11-11 | 1992-05-12 | 1992-11-11 | $7700.00 | Window Closed / Lapsed |