Copper alloy, copper alloy plate, and process for producing the same

A technology of copper alloy plates and copper alloys, applied in the field of copper alloy poles and its manufacture, and copper alloys, can solve the problems of insufficient bending workability and punching and shearing properties, and achieve excellent bending workability, excellent punching and shearing properties, Excellent bending properties

Active Publication Date: 2008-04-30
KOBE STEEL LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0017] In contrast, conventional Cu-Ni-Sn-based solid-solution copper alloys have insufficient bending and punching properties.

Method used

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  • Copper alloy, copper alloy plate, and process for producing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0046] (composition of copper alloy)

[0047] First, the component composition of the copper alloy of the present invention will be described below. In the present invention, the composition of the copper alloy is a Cu-Ni-Sn-P alloy, and as a premise, as mentioned above, it is possible to cast an ingot in a shaft furnace, and because of its high productivity, it is possible to realize a substantial cost reduction. Chemicalized Cu-Ni-Sn-P alloys.

[0048] Then, in order to be excellent in the high stress relaxation resistance characteristic in the direction perpendicular to the rolling direction required as a connecting element such as an automotive terminal / connector, and also to be excellent in bending characteristics, electrical conductivity, and strength, copper alloys Basically, Ni: 0.1 to 3.0%, Sn: 0.01 to 3.0%, and P: 0.01 to 0.3% are respectively contained, and the balance is composed of copper and unavoidable impurities. In addition, the % indication of content of ea...

Embodiment approach 2

[0095] Hereinafter, the copper alloy sheet according to Embodiment 2 of the present invention will be described. First, the composition of the copper alloy according to Embodiment 2 of the present invention will be described.

[0096] Ni is an element that is dissolved in a copper alloy to strengthen the stress relaxation resistance, and is an element that improves the strength. However, when the content is less than 0.4%, there is no such effect, and if it exceeds 1.6%, intermetallic compounds are easily precipitated with P added at the same time, so that solid-solution Ni decreases, and the stress relaxation resistance characteristic decreases. Therefore, the content is 0.4 to 1.6%. More preferably, it is the range of 0.7-0.9%.

[0097]Sn is a solid solution in the copper alloy, and is an element that improves the strength by work hardening. Also in this alloy system is an element that contributes to heat resistance. In the copper alloy sheet of the present invention, in...

Embodiment 1

[0121] Examples of the present invention are described below. Various copper alloy sheets of Cu-Ni-Sn-P alloys with different states of Ni compounds in the structure were produced, and properties such as strength, electrical conductivity, and stress relaxation resistance were evaluated.

[0122] Specifically, copper alloys with chemical compositions shown in Table 1 were melted in a centerless induction furnace, and then ingots were cast by semi-continuous casting to obtain ingots with a thickness of 70 mm x width 200 mm x length 500 mm. The respective ingots were collectively rolled under the following conditions to produce copper alloy thin plates. The surface of each ingot was end-cut and heated, then hot-rolled to form a 16-mm-thick plate, and rapidly cooled in water from a temperature of 650° C. or higher.

[0123] [Table 1]

[0124] Area

Minute

combine

gold

make up

No

Chemical composition of copper alloy plate (remainder C...

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Abstract

This invention provides a copper alloy having excellent stress relaxation resistance, comprising Ni: 0.1 to 3.0% (% by mass; the same shall apply hereinafter), Sn: 0.01 to 3.0%, and P: 0.01 to 0.3% with the balance consisting of copper and unavoidable impurities, characterized in that the content of Ni in an extraction residue after extraction separation on a filter having an opening size of 0.1 [mu]m by an extraction residue method is not more than 40% in terms of the proportion to the content of Ni in the copper alloy. In the extraction residue method, 10 g of the copper alloy is immersed in 300 ml of a methanol solution having an ammonium acetate concentration of 10% by mass. This copper alloy is used as an anode. On the other hand, platinum is used as a cathode. Galvanostatic electrolysis is carried out at a current density of 10 mA/cm<2>. A solution containing this copper alloy dissolved therein is subjected to suction filtration by a polycarbonate membrane filter having an opening size of 0.1 [mu]m, and the insolubles as the residue are separated and extracted on the filter. The content of Ni in the extraction residue is determined by dissolving the insolubles as the residue on the filter in a solution composed of a mixture of aqua regia and water at a ratio of 1 : 1, and then analyzing the solution by ICP emission spectrometry.

Description

technical field [0001] The present invention relates to a copper alloy, a copper alloy electrode, and a method for producing the same, which are excellent in bending workability, punching property, and stress relaxation resistance, and are particularly suitable for automotive terminals / connectors. Background technique [0002] In recent years, connecting components such as terminals and connectors for automobiles have been required to have performances that can ensure reliability in high-temperature environments such as engine rooms at low cost. One of the most important characteristics for reliability in this high-temperature environment is the maintenance characteristic of the contact point fitting force, which is the so-called stress relaxation resistance characteristic. That is, when a spring-shaped element made of copper alloy is given a normal displacement, for example, when the spring-shaped contact point of the female terminal is fitted into the tab of the male termi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C9/06C22C9/02C22F1/08
Inventor 有贺康博野村幸矢梶原桂杉下幸男坂本浩
Owner KOBE STEEL LTD
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