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Cu-ni-al-based copper alloy sheet, method for producing same, and conductive spring member

A manufacturing method and technology of copper alloys, applied in the direction of manufacturing tools, furnaces, heat treatment equipment, etc., can solve the problems of inability to achieve the level of strength, and achieve the effect of excellent strength-bending workability balance and excellent discoloration resistance

Active Publication Date: 2021-04-30
DOWA METALTECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in this method, a tensile strength level of 900 MPa or more or further 1000 MPa or more cannot be achieved.
In addition, Patent Document 4 does not suggest a method for improving discoloration resistance.

Method used

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  • Cu-ni-al-based copper alloy sheet, method for producing same, and conductive spring member
  • Cu-ni-al-based copper alloy sheet, method for producing same, and conductive spring member
  • Cu-ni-al-based copper alloy sheet, method for producing same, and conductive spring member

Examples

Experimental program
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Effect test

Embodiment

[0114] Copper alloys having the chemical compositions shown in Table 1 were melted and produced using a vertical semi-continuous casting machine. The obtained slabs were heated and held at the temperature and time shown in Table 2A and Table 2B, then pulled out, hot rolled, and water cooled. The total hot rolling rate was 90% to 95%, and the rolling rate in the temperature range of 950° C. or higher, the rolling temperature in the final pass, and the final plate thickness after hot rolling are shown in Table 2A and Table 2B. In some examples where cracks occurred during hot rolling, production was stopped at this point. After hot rolling, the oxide layer on the surface layer was removed by mechanical grinding (face grinding), and cold rolling was performed at the rolling ratio shown in Table 2A and Table 2B to prepare an intermediate product plate for solution treatment. Solution treatment was performed on each intermediate product plate under the conditions shown in Table 2A...

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Abstract

Provided is a copper alloy sheet, which comprises a Cu-Ni-Al-based copper alloy having a composition range exhibiting a white metallic appearance, and which has excellent "balance between strength and bending workability" and excellent discoloration resistance, the copper alloy sheet having a chemical composition composed of: 12.0-30.0 (exclusive of 12.0) mass% of Ni; 1.80-6.50 mass% of Al; 0-0.30 mass% of Mg; 0-0.20 mass% of Cr; 0-0.30 mass% of Co; 0-0.10 mass% of P; 0-0.05 mass% of B; 0-0.20 mass% of Mn; 0-0.40 mass% of Sn; 0-0.50 mass% of Ti; 0-0.20 mass% of Zr; 0-0.50 mass% of Si; 0-0.30 mass% of Fe; 0-1.00 mass% of Zn; and the balance comprising Cu and inevitable impurities, wherein Ni / Al<=15.0, and, in the observation surface which is parallel to the sheet surface (rolled surface), a metallic structure in which the number density of fine second phase particles having a particle diameter of 20-100 nm, is 1.0*10<7> mm<2> or more.

Description

technical field [0001] The present invention relates to a Cu-Ni-Al-based copper alloy plate material, a method for producing the same, and a conductive spring member using the plate material. Background technique [0002] The Cu-Ni-Al-based copper alloy can be strengthened due to the Ni-Al-based precipitates, and the copper alloy also exhibits a metallic appearance with a thin copper tone. This copper alloy is useful as a conductive spring member of a lead frame, a connector, etc., and a nonmagnetic high-strength member. [0003] Conductive spring members such as connectors are generally produced through a process including bending. Therefore, high strength and excellent bending workability, that is, excellent "strength-bending workability balance" are required for the copper alloy sheet material used as a raw material for obtaining a high-performance and high-dimensionally accurate conductive spring member. In addition, in the case of a Cu-Ni-Al-based copper alloy, increa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C9/06C22F1/08C22F1/00
CPCC22C9/06C22F1/08C21D8/0226C21D8/0236C21D9/46
Inventor 首藤俊也须田久
Owner DOWA METALTECH CO LTD