Metal treatment – Stock – Copper base
Reexamination Certificate
2005-05-17
2005-05-17
Ip, Sikyin (Department: 1742)
Metal treatment
Stock
Copper base
C420S476000
Reexamination Certificate
active
06893514
ABSTRACT:
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/mm2or more.
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Hirai Takao
Usami Takayuki
Ip Sikyin
The Furukawa Electric Co. Ltd.
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