The Furukawa Electric Co., Ltd.

Takao Hirai

Takayuki Usami

Yoshimasa Ohyama

A copper alloy material for parts of electronic and electric machinery and tools contains 1.0 to 3.0 mass % of Ni, 0.2 to 0.7 mass % of Si, 0.01 to 0.2 mass of Mg, 0.05 to 1.5 mass % of Sn, 0.2 to 1.5 mass % of Zn, and less than 0.005 mass % (including 0 mass %) of S, with the balance being Cu and inevitable impurities, wherein the copper alloy material has:

Copper alloy material for parts of electronic and electric machinery and tools

A high-mechanical strength copper alloy, which comprises Ni 1.0 to 4.5% by mass, Si 0.2 to 1.0% by mass, Mg 0.01 to 0.20% by mass, Sn 0.05 to 1.5% by mass, Zn 0.2 to 1.5% by mass, and S less than 0.005% by mass (including 0% by mass), with the balance being made of Cu and inevitable impurities, wherein the alloy has a tensile strength of 800 N/mmor more, and wherein the alloy has a stress relaxation ratio of 10% or less.

High-mechanical strength copper alloy

A high-mechanical strength copper alloy, which comprises Ni 3.5 to 4.5% by mass, Si 0.7 to 1.0% by mass, Mg 0.01 to 0.20% by mass, Sn 0.05 to 1.5% by mass, Zn 0.2 to 1.5% by mass, and S less than 0.005% by mass (including 0% by mass), with the balance being made of Cu and inevitable impurities, wherein a crystal grain diameter is from more than 0.001 mm to 0.025 mm; and the ratio (a/b), between a longer diameter a of a crystal grain on a cross section parallel to a direction of final plastic-working, and a longer diameter b of a crystal grain on a cross section perpendicular to the direction of final-plastic working, is 1.5 or less, and wherein the alloy has a tensile strength of 800 N/mmor more.

A copper alloy with excellent punchability, comprising 0.2 to 0.35 wt % of Cr, 0.1 to 0.5 wt % of Sn, and 0.1 to 0.5 wt % of Zn, the balance being made of Cu and unavoidable impurities, wherein, in a Cu matrix, a precipitation phase A of Cr or a Cr compound of 0.1 to 10 &mgr;m in maximum diameter, is provided, at a density in number of 1&times;10 to 3&times;10 /mm , and a precipitation phase B of Cr or a Cr compound of 0.001 to 0.030 &mgr;m in maximum diameter, is provided, at a density in number that is 10 times or more of that of the precipitation phase A.

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Tokyo, Japan

Takao Hirai