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US3852121A Expired / Lapsed US ⏱️ 0.0 years remaining

Process for making a novel copper base alloy

Assignee: Olin Corp
•
Filing: 1973-09-20
•
Granted: 1974-12-03
•
Expires: 1993-09-20
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Abstract

Abstract A method of preparing a copper alloy is disclosed which comprises providing in the alloy about 0.8 - 2.3% iron and about 0.3 - 1.7% cobalt, such that the amount of iron plus cobalt ranges from about 1.5 - 2.5%, from about 5 - 13% zinc, balance essentially copper. The alloy is hot rolled at a temperature of at least 500*C, and cold rolled by a process which includes conducting at least one interanneal between successive cold reductions. The interanneal is conducted at temperatures ranging from about 400 to 600*C for a period of at least 15 minutes. Processing may also include a final anneal at a temperature of from 350 to 600*C conducted for at least 15 minutes. The novel alloy of this invention possesses a combination of strength and electrical conductivity which makes it a suitable replacement for the C.D.A. 400 series tin-brass alloys.

Inventors

  • 👤 J Crane
  • 👤 S Friedman
  • 👤 M Pryor

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-31 14:58
CPC Classifications
C; C22; C22C; C22C9/00; C22C9/04

Claims Analysis

Total Claims: 9
Claim 1
Independent Claim 109 words
A METHOD OF PREPARING COPPER ALLOYS CONSISTIG ESSENTIALLY OF ABOUT 0.8-2.3% IRON AND ABOUT 0.3-1.7% COBALT, SUCH THAT THE AMOUNT OF IRON PLUS COBALT RANGES FROM ABOUT 1.5 TO 2.5%, FROM 5 TO 13% ZINC AND THE BALANCE ESSENTIALLY COPPER, TO PROVIDE IMPROVED STRENGTH, BEND PROPERTIES, AND ELECTRICAL PROPERTIES WHICH COMPRISES: A. HOT ROLLING THE ALLOY AT A TEMPERATURE OF AT LEAST 500*C, BUT BELOW ITS MELTING TEMPERATURE; AND B. COLD ROLLING TO AT LEAST 505 COLD REDUCTION WHEREIN SAID COLD ROLLING INCLUDES SUCCESSIVE COLD REDUCTIONS AND AT LEAST ONE INTERNNEAL CONDUCTED THEREBETWEEN AT TEMPERATURES RANGING FROM ABOUT 400 TO 600*C FOR A PERIOD OF AT LEAST 15 MINUTES.
Claim 2
Independent Claim 109 words
A METHOD OF PREPARING COPPER ALLOYS CONSISTIG ESSENTIALLY OF ABOUT 0.8-2.3% IRON AND ABOUT 0.3-1.7% COBALT, SUCH THAT THE AMOUNT OF IRON PLUS COBALT RANGES FROM ABOUT 1.5 TO 2.5%, FROM 5 TO 13% ZINC AND THE BALANCE ESSENTIALLY COPPER, TO PROVIDE IMPROVED STRENGTH, BEND PROPERTIES, AND ELECTRICAL PROPERTIES WHICH COMPRISES: A. HOT ROLLING THE ALLOY AT A TEMPERATURE OF AT LEAST 500*C, BUT BELOW ITS MELTING TEMPERATURE; AND B. COLD ROLLING TO AT LEAST 505 COLD REDUCTION WHEREIN SAID COLD ROLLING INCLUDES SUCCESSIVE COLD REDUCTIONS AND AT LEAST ONE INTERNNEAL CONDUCTED THEREBETWEEN AT TEMPERATURES RANGING FROM ABOUT 400 TO 600*C FOR A PERIOD OF AT LEAST 15 MINUTES.
Claim 3
Dependent Claim 25 words
The method of claim 1 wherein the cold reduction conducted prior to the last interanneal yields a cross sectional area reduction of at least 50%.
Claim 4
Dependent Claim 24 words
The method of claim 1 wherein said interanneal is conducted at temperatures ranging from about 450 to 500*C for from 1 to 4 hours.
Claim 5
Dependent Claim 34 words
The method of claim 1 wherein said alloy is melted at a temperature of from about 1200 to 1300*C, and cast at a temperature such that the resultant mold temperature is at least 1175*C.
Claim 6
Dependent Claim 30 words
The method of claim 1 wherein, prior to hot rolling, the alloy is soaked at a temperature of from 800 to 1000*C for a period of up to 1 hour.
Claim 7
Dependent Claim 18 words
The method of claim 5 wherein said alloy is soaked at a temperature of from 900 to 950*C.
Claim 8
Dependent Claim 25 words
The method of claim 1 wherein the cold rolled alloy is finally annealed at a temperature of 350 - 600*C for at least 15 minutes.
Claim 9
Dependent Claim 25 words
The method of claim 7 wherein the final anneal is conducted at a temperature of from 350 to 450*C for from 1 to 8 hours.

References Cited (Backward Citations)

US1723922A Cited
US1959509A Cited
US2126827A Cited
US2147844A Cited
US2155406A Cited
US2169188A Cited
US2295180A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1977-12-02 1978-06-03 1978-12-03 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1981-12-02 1982-06-03 1982-12-03 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1985-12-02 1986-06-03 1986-12-03 $7700.00 Window Closed / Lapsed

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