| 摘要 |
A Cu-Cr-Zr based precipitation-hardening type alloy is improved to be suited for electrical components, required to exhibit improved, strength, electric conductivity, cyclic bending formability, soldering property, reliability of soldered portion, Ag plating property, press-blanking formability, and non occurrence of burr. An alloy composition is 0.05 - 0.40% of Cr, 0.03 - 0.25% of Zr, 0.10-1.80% of Fe, 0.10 - 0.80% of Ti, and balance of Cu and unavoidable impurities, where the Fe/Ti weight ratio is 0.66 - 2.6 in a range of 0.10 - 0.60% of Ti, and an Fe/Ti weight ratio is 1.1 - 2.6 in a range of from more than 0.60 to 0.80% of Ti. An average grain size is 60 mu m or less. Another alloy composition is 0.05 - 0.40% of Cr, 0.03 - 0.25% of Zr, 0.0005 - less than 0.01% of S, and balance of Cu and unavoidable impurities. This alloy may contain Fe in the same content as in the first mentioned alloy at the specific Fe/Ti ratio mentioned above. |
