Mitsubishi Shindoh Co., Ltd.

Akira Saito

Yoshio Abe

Takeshi Sakurai

Jun-Ichi Kumagai

Shuzo Umezu

Yoshihiro Kameyama

Ryo Iino

A Cu&#x2014;Ni&#x2014;Si-based copper alloy sheet of the invention has excellent mold abrasion resistance and shear workability while maintaining strength and conductivity, in which 1.0 mass % to 4.0 mass % of Ni is contained, 0.2 mass % to 0.9 mass % of Si is contained, the remainder is made up of Cu and inevitable impurities. The number of the Ni&#x2014;Si precipitate particles having a grain diameter in a range of 20 nm to 80 nm in a surface layer that is as thick as 20% of the entire sheet thickness from the surface is represented by a particles/mm, and the number of the Ni&#x2014;Si precipitate particles having a grain diameter in a range of 20 nm to 80 nm in a portion below the surface layer is represented by b particles/mm, a/b is in a range of 0.5 to 1.5.

Cu&#x2014;Ni&#x2014;Si-based copper alloy sheet having excellent mold abrasion resistance and shear workability and method for manufacturing same

The Cu&#x2014;Ni&#x2014;Si-based copper alloy plate contains 1.0 mass % to 3.0 mass % of Ni, and Si at a concentration of &#x2159; to &#xbc; of the mass % concentration of Ni with a remainder of Cu and inevitable impurities, in which, when the average value of the aspect ratio (the minor axis of crystal grains/the major axis of crystal grains) of each crystal grains in an alloy structure is 0.4 to 0.6, the average value of GOS in the all crystal grains is 1.2&#xb0; to 1.5&#xb0;, and the ratio (L&#x3c3;/L) of the total special grain boundary length L&#x3c3; of special grain boundaries to the total grain boundary length L of crystal grain boundaries is 60% to 70%, the spring bending elastic limit becomes 450 N/mmto 600 N/mm, the solder resistance to heat separation is favorable and deep drawing workability is excellent at 150&#xb0; C. for 1000 hours.

Cu-Ni-Si-based copper alloy plate having excellent deep drawing workability and method of manufacturing the same

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Aizuwakamatsu, Japan

Akira Saito