| 摘要 |
PURPOSE:To obtain the titled alloy having superior tensile strength and a high elastic limit value while eliminating the defects and problems of two kinds of phosphor bronze or phosphor bronze for a spring by specifying the amounts of Sn and P contained in Cu and adding a prescribed amount of Fe or Co. CONSTITUTION:This Cu alloy for a terminal or a connector consists of, by weight, 3.0-6.5% Sn, 0.025-0.045% P, 0.05-0.15% Fe and/or Co and the balance Cu. A Cu alloy ingot having said composition is hot rolled at >=about 80% draft and cooled from >=about 600 deg.C to <=about 350 deg.C at >=about 25 deg.C/min cooling rate. The alloy is cold rolled at >=about 80% draft, annealed at 350-550 deg.C for about 5-180min, and finish-rolled according to the use. The alloy is then subjected to tension annealing at about 200-500 deg.C for about 5-60sec to relieve the local stress. Lonnealing may be carried out at about 200-500 deg.C for about 30-180min before the tension annealing. Thus, the desired alloy is obtd.
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