| 摘要 |
PURPOSE:To obtain the titled copper-based alloy having strength resistant to deformation equal to that of 42 alloy and having relatively high electric conductivity by cold rolling the copper alloy contg. specific amounts of Sn, Ni and P in such a manner that the final working ratio is regulated to the prescribed value. CONSTITUTION:The copper alloy contg., by weight, 1.7-2.5% Sn, 0.1-0.6% Ni, 0.005-0.15% P and the balance consisting substantially of Cu is cold rolled in such a manner that the final working ratio if regulated to 45-85%. After said final rolling, the copper alloy is subjected to annealing or tension annealing at 150-450 deg.C, by which the bending deformability thereof is improved. In said low temp. annealing or tension annealing after the final rolling, the purpose is to improve the bending workability; the min. temp. at which the effect is obtd. is regulated to the lower limit and the temp. range in which the influence on the level of strength by the annealing can be hardly recognized is regulated as the above-mentioned manner. By this invention, the titled copper alloy having the strength equal to that of 42 alloy and having good electric conductivity can be obtd. in the use of relatively inexpensive components.
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