# US 4,394,185 A · Processing for copper beryllium alloys

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- Number: US 4,394,185 A
- Document ID: US4394185A
- Status: Granted
- Kind: A
- Application number: 06/363,682
- Filed: 1982-03-30
- Granted: 1983-07-19
- Earliest claimed: 1982-03-30
- Assignees: Cabot Berylco Inc.
- Inventors: Henry T. McClelland; Joseph B. Kuhn
- Web page: https://patentgrep.com/patent/US4394185A

## CPC

- C22F 1/08: of copper or alloys based thereon
- C22F: CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS (surface treatment of metallic material involving at least one process provided for in class C23 and at least one process covered by this subclass, C23F17/00)

## Abstract

A process for producing formed copper beryllium alloys. The process includes the steps of: preparing a copper beryllium melt; casting the melt; hot working the cast copper beryllium; solution annealing the copper beryllium; optionally cold working the solution annealed copper beryllium; forming the copper beryllium; and age hardening the formed copper beryllium; and the improvement comprising the step of preaging the solution annealed or solution annealed and cold worked copper beryllium, prior to forming, at a temperature of from 400.degree. to 1000.degree. F. for a period of up to 180 seconds, the copper beryllium being at final gauge prior to preaging.

## Claims

### Claim 1

In a process for producing formed parts from a copper beryllium alloy, which process includes the steps of: preparing a copper beryllium melt; casting the melt, hot working the cast copper beryllium; solution annealing the copper beryllium; optionally cold working the solution annealed copper beryllium; forming the copper beryllium; and age hardening the formed copper beryllium at a temperature of from 400.degree. to 1200.degree. F. for a period of at least 4 minutes; the improvement comprising the step of preaging the solution annealed or solution annealed and cold worked copper beryllium, prior to forming, at a temperature of from 400.degree. to 1000.degree. F. for a period of up to 180 seconds, the copper beryllium being at final gauge prior to preaging.

### Claim 2 (depends on 1)

The process according to claim 1, wherein the preaging temperature is from 550.degree. to 900.degree. F.

### Claim 3 (depends on 2)

The process according to claim 2, wherein the preaging temperature is from 650.degree. to 850.degree. F.

### Claim 4 (depends on 1)

The process according to claim 1, wherein the copper beryllium is preaged for a period of up to 110 seconds.

### Claim 5 (depends on 4)

The process according to claim 4, wherein the copper beryllium is preaged for a period of up to 90 seconds.

### Claim 6 (depends on 5)

The process according to claim 5, wherein the preaging temperature is from 650.degree. to 850.degree. F.

### Claim 7 (depends on 1)

A formed part of copper beryllium having from 0.2 to 3.0% beryllium, up to 3.5% of material from the group consisting of cobalt and nickel, and at least 90% copper and made in accordance with the process of claim 1.