Softening-resistant copper alloy and method of forming sheet of the same

a technology of softening resistance and copper alloy, which is applied in the direction of metal rolling arrangements, etc., can solve the problems of inability to achieve the miniaturization, weight reduction and improvement of softening resistance of copper alloy parts, and the high softening resistance intended by the present invention cannot be guaranteed, so as to reduce the dimensional accuracy of parts, reduce the strength, and high softening resistance

Inactive Publication Date: 2005-05-05
KOBE STEEL LTD
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Benefits of technology

[0016] According to the present invention, a stable copper alloy having high softening resistance can be produced by controlling cube orientation density after annealing at 500° C. for 1 min to 50% or below. Reduction of strength that occurs in the sheet of the conventional material when the sheet is treated by a heat treatment for annealing or the like can be suppre

Problems solved by technology

Such a heat treatment often softens the workpiece, and the workpiece treated by the heat treatment is unable to maintain its initial mechanical strength.
However, it is impossible to achieve the miniaturization, weight reduction and improvement of softening res

Method used

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  • Softening-resistant copper alloy and method of forming sheet of the same
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  • Softening-resistant copper alloy and method of forming sheet of the same

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[0035] Examples of the present invention and comparative examples will be described.

[0036] Copper alloys of chemical compositions shown in Table 1 were melted in a coreless low-frequency induction furnace and copper alloy ingots of 50 mm in thickness, 200 mm in width and 500 mm in length were produced by a semicontinuous casting process. Each of the ingots was heated and the thickness was reduced to 12 mm by hot rolling and the sheet was machined by facing. Then the ingot was processed by a plurality of working cycles each of a cold rolling process and an annealing process, and the sheet was rolled in a copper alloy sheet of about 0.2 mm in thickness by finish cold rolling.

[0037] The copper alloy sheets were annealed at 500° C. fore 1 min in a salt bath. Specimens were sampled from the annealed copper alloy sheets. The specimens were ground and buffed. The surfaces of the specimens were finished by electrolytic polishing. A region of 500 μm×500 μm in the surface of each of the tes...

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Abstract

A softening-resistant copper alloy contains Fe in an Fe content in the range of 0.01 to 4.0% by mass. The copper alloy has a cube orientation density of 50% or below and a mean grain size of 30 μm or below after being annealed at 500° C. for 1 min. A copper alloy sheet forming method of forming a copper alloy sheet comprises, in successive steps: a hot rolling process for hot-rolling a copper alloy sheet of the copper alloy according to any one of claims 1 to 4, at least two working cycles each of a cold rolling process and an annealing process, and a finish cold rolling process. Reduction ratio for each of the cold rolling processes of the working cycles is in the range of 50 to 80%, and reduction ratio for the finish cold rolling process is in the range of 30 to 85%.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a softening-resistant copper alloy having high softening resistance and a method of forming a sheet of the softening-resistant copper alloy. The softening-resistant copper alloy having high softening resistance can be effectively applied to various fields including the electric, the electronic and the mechanical field. [0003] 2. Description of the Related Art [0004] The recent progressive advancement of device miniaturization, device thinning and weight reduction of various devices including electronic devices has urged the rapid progress of the miniaturization and weight reduction of copper alloy parts including lead frames, terminals and connectors for those small, lightweight devices. [0005] For example, a copper alloy containing Fe in a small Fe content is sued widely for forming lead frames for semiconductor devices. A copper alloy designated by CDA194 excellent in strength, ele...

Claims

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Application Information

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IPC IPC(8): C21D1/26C22C9/00C22F1/08C22F1/00
CPCC22F1/08C22C9/00B21B3/00B24B1/00C25F3/16
Inventor ARUGA, YASUHIROKAJIHARA, KATSURA
Owner KOBE STEEL LTD
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